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Baystruk-Glodan, L. Z., e M. M. Кhomiak. "Working collection of crimson clover (Trifolium incarnatum L.) in the Ciscarpathia". Genetičnì resursi roslin (Plant Genetic Resources), n.º 31 (2022): 82–93. http://dx.doi.org/10.36814/pgr.2022.31.08.
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Aim. To identify collection accessions – sources of valuable traits for using as starting material to create varieties of perennial grasses in Western Ukraine. Results and Discussion. The vegetable protein problem is one of the main issues facing scientists whose activities are related to agriculture, ecology and other areas of biology. The Ciscarpathia is a zone of natural meadows, hayfields and pastures, where a large number of plant species belonging to different botanical families grow. Among the natural vegetation on pastures, meadows and fallows, clover species are most often found. Trifolium incarnatum L. is an annual winter-spring plant. It is widely used in agriculture as a nitrogen-fixing cover crop. The crimson clover collection comprises 24 accessions. Some promising accessions that can be used as starting material in breeding for high productivity (green mass, hay and seeds), herbage capacity, resistance to diseases and pests were selected. Reference accessions and sources of economically valuable traits, which are actively involved in breeding, were singled out. During the study (2019-2021), accessions were investigated in detail for biological and morphological features. We evaluated the crimson clover collection for germinability, winter survival, flowering time, green mass per plant, and seed yield. The results showed that the crimson clover collection could be tentatively divided into 3 groups: early-ripening (70-79 days; 37.5%), mid-ripening (83-87 days; 50.0%) and late-ripening (92-94 days; 12.5%). Nine accessions (PFZ 00625, PFZ 02148, PFZ 01264, PFZ 01266, PFZ 01295, PFZ 01273, PFZ 01270, PFZ 02266, and PFZ 02265) ripened slightly earlier. They are potential parents to develop an early-ripening population. Three accessions (PFZ 02268, PFZ 02267, and PFZ 02073) ripened significantly later than all the others. Thus, these accessions are excellent candidates to develop a late-ripening population. Depending on the region and cultivation system, farmers may be interested in both early-ripening and late-ripening crimson clover. Conclusions. Literature review allowed us to note that the studied crimson clover accessions had several advantages when used in production, namely: they are annuals, have high vegetation rates and productive potentials. Crimson clover accessions showed particularly distinct differences in autumn emergence and flowering time, indicating greater diversity and potential for breeding. In contrast, winter survival, green mass per plant showed greater intra- and inter-year variations. Autumn emergence and winter survival were found to be positively correlated, and both traits were negatively correlated with green mass per plant. Some accessions were identified as highly effective in several key traits and are of particular interest as parents in further breeding: PFZ 02118, PFZ 01270, PFZ 02267, PFZ 02073, PFZ 02072, PFZ 01290.
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Moore, Virginia, Brian Davis, Megan Poskaitis, Jude E. Maul, Lisa Kissing Kucek e Steven Mirsky. "Phenotypic and Nodule Microbial Diversity among Crimson Clover (Trifolium incarnatum L.) Accessions". Agronomy 10, n.º 9 (21 de setembro de 2020): 1434. http://dx.doi.org/10.3390/agronomy10091434.
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Crimson clover (Trifolium incarnatum L.) is the most common legume cover crop in the United States. Previous research found limited genetic variation for crimson clover within the National Plant Germplasm System (NPGS) collection. The aim of this study was to assess the phenotypic and nodule microbial diversity within the NPGS crimson clover collection, focusing on traits important for cover crop performance. Experiments were conducted at the Beltsville Agricultural Research Center (Maryland, USA) across three growing seasons (2012–2013, 2013–2014, 2014–2015) to evaluate 37 crimson clover accessions for six phenotypic traits: fall emergence, winter survival, flowering time, biomass per plant, nitrogen (N) content in aboveground biomass, and proportion of plant N from biological nitrogen fixation (BNF). Accession effect was significant across all six traits. Fall emergence of plant introductions (PIs) ranged from 16.0% to 70.5%, winter survival ranged from 52.8% to 82.0%, and growing degree days (GDD) to 25% maturity ranged from 1470 GDD to 1910 GDD. Biomass per plant ranged from 1.52 to 6.51 g, N content ranged from 1.87% to 2.24%, and proportion of plant N from BNF ranged from 50.2% to 85.6%. Accessions showed particularly clear differences for fall emergence and flowering time, indicating greater diversity and potential for selection in cover crop breeding programs. Fall emergence and winter survival were positively correlated, and both were negatively correlated with biomass per plant and plant N from BNF. A few promising lines performed well across multiple key traits, and are of particular interest as parents in future breeding efforts, including PIs 369045, 418900, 561943, 561944, and 655006. In 2014–2015, accessions were also assessed for nodule microbiome diversity, and 11 genera were identified across the sampled nodules. There was large variation among accessions in terms of species diversity, but this diversity was not associated with observed plant traits, and the functional implications of nodule microbiome diversity remain unclear.
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Dubal, Ítala T. P., Ivan R. Carvalho, Vinícius J. Szareski, João R. Pimentel, Cristian Troyjack, Gustavo H. Demari, Giordano G. Conte et al. "Growth and Vigor Analysis of Crimson Clover Seeds Obtained Through Different Seeds Size". Journal of Agricultural Science 11, n.º 2 (15 de janeiro de 2019): 548. http://dx.doi.org/10.5539/jas.v11n2p548.
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The objective to evaluate the effect of the size of the crimson clover seeds under the vigor of produced seeds, as well the growth and development throughout the crop cycle. The work was conducted in the experimental area of the Plant Science Department of the Federal University of Pelotas, in the state of Rio Grande do Sul, Brazil. It were used crimson clover seeds (Trifolium incarnatum L.), cultivar “Crimson Clover”. The seeds size effect affected the growth and the partition of the assimilated in the crimson clover plants, where medium size seeds raise the biomass accumulation in the different plants structures. Seeds of crimson clover produced from plants originated from different seed sizes did not presented difference in relation to the physiologic quality, seedling emergence and speed of emergence index.
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Kubíková, Zuzana, Helena Hutyrová e Hana Smejkalová. "Differences in the Ripening of Two Clover Species and the Effect of Pre-harvest Desiccation". Poljoprivreda 29, n.º 1 (20 de junho de 2023): 3–11. http://dx.doi.org/10.18047/poljo.29.1.1.
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Experiments were focused on differences in the ripening of crimson clover (Trifolium incarnatum L.) and red clover (Trifolium pratense L.) and on the influence of the pre-har vest treatment with desiccants. The drying of leaves, stems and heads during ripening, regrowing, breakdown of heads and yield parameters including seed were compared. The crimson clover exhibited the natural drying of leaves, stems and heads faster than the red clover. In crimson clover, the drying of leaves, stems and heads before the har vest was 80 - 100%, 50– 95%, and 100 %, respectively. In red clover, the drying of leaves, stems and heads was 25 - 84 %, 20–72% and 45–99%, respectively. There were also dif ferences in the regrowing and in the breakdown of heads. In the pre-harvest treatments of crimson clover and red clover, the effect of diquat was compared with the efficiency of other herbicide substances (pyraflufen-ethyl, carfentrazone-ethyl and pelargonic acid) and with the efficiency of a high dose of DAM fertilizer (liquid fertilizer, urea-ammonium nitrate). Compared with diquat, the drying was slower with the other active substances. Significant effects of tested active substances on yield, WTS (weight of thousand seeds) and germination were not recorded.
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Bugg, Robert L., Felix L. Wäckers, Kathryn E. Brunson, Sharad C. Phatak e James D. Dutcher. "Tarnished Plant Bug (Hemiptera: Miridae) on Selected Cool-Season Leguminous Cover Crops". Journal of Entomological Science 25, n.º 3 (1 de julho de 1990): 463–74. http://dx.doi.org/10.18474/0749-8004-25.3.463.
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Replicated field trials indicated that tarnished plant bug (TPB), Lygus lineolaris (Palisot de Beauvois) (Hemiptera: Miridae) attained relatively-high densities on hybrid vetches, Vicia sativa L. X V. cordata Wulf cv ‘Cahaba White’ and ‘Vantage’, lower densities on crimson clover, Trifolium incarnatum L. cv ‘Dixie,’ and particularly-low densities on subterranean clover, Trifolium subterraneum L. cv ‘Mt. Barker’. Densities of TPB were also relatively low on an additional 10 types of subterranean clover, including 7 cultivars representing T. subterraneum, 1 cultivar of T. brachycalycinum Katznelson and Morley, and 3 of T. yanninicum Katznelson and Morley. Field longevity trials indicated that late-instar and adult TPB lived longer when caged on crimson clover than on hybrid vetch, which in turn supported better survival than did subterranean clover. When adult TPB were caged on hybrid vetch or subterranean clover with or without floral and fruiting structures, there was no evidence that the presence of these structures prolonged TPB survival on either crop. In laboratory choice tests with flowering and fruiting shoots of three cover crops, TPB preferred crimson clover over hybrid vetch, which in turn was more attractive than subterranean clover. When shoots were presented after reproductive structures had been excised, there was no statistically-significant preference by TPB.
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Bandele, Owusu A., Marion Javius, Byron Belvitt e Oscar Udoh. "COVER CROP AND NITROGEN FERTILIZER RATE INFLUENCES ON YIELDS OF SEQUENTIALLY PLANTED VEGETABLES". HortScience 27, n.º 6 (junho de 1992): 570c—570. http://dx.doi.org/10.21273/hortsci.27.6.570c.
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Fall-planted cover crops of hairy vetch (Vicia villosa Roth), Austrian winter pea (Pisum sativum subsp. arvense L. Poir), and crimson clover (Trifolium incarnatum L.) were each followed by spring-planted 'Sundance' summer squash [Cucurbita pepo var. melopepo (L.) Alef.] and 'Dasher' cucumber (Cucumis sativus L.). Squash and cucumber crops were followed by fall 'Florida Broadleaf mustard green [Brassica juncea (L.) Czerniak] and 'Vates' collard (Brassica oleracea L. Acephala group), respectively. The same vegetable sequences were also planted without benefit of cover crop. Three nitrogen (N) rates were applied to each vegetable crop. Squash following winter pea and crimson clover produced greater yields than did squash planted without preceding cover crop. Cucumber following crimson clover produced the greatest yields. No cover crop effect was noted with mustard or collard. Elimination of N fertilizer resulted in reduced yields for all crops, but yields of crops with one-half the recommended N applied were generally comparable to those receiving the full recommended rate.
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Panciera, M. T., e S. D. Sparrow. "Effects of nitrogen fertilizer on dry matter and nitrogen yields of herbaceous legumes in interior Alaska". Canadian Journal of Plant Science 75, n.º 1 (1 de janeiro de 1995): 129–34. http://dx.doi.org/10.4141/cjps95-021.
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Birdsfoot trefoil (Lotus corniculatus L.), arrowleaf clover (Trifolium vesiculosum Savi.), berseem clover (Trifolium alexandrinum L.), crimson clover (Trifolium incarnatum L.), barrel medic (Medicago truncatula Gaertn.), winter vetch (Vicia villosa subsp. varia L.), flatpea (Lathyrus tingitanus L.), red clover (Trifolium pratense L.), alfalfa (Medicago sativa L.), sweetclover (Melilotus officinalis Lam.), fababean (Vicia faba L.), field pea (Pisum sativum subsp. arvense L.) and white lupin (Lupinus alba L.) were grown for 2 yr in interior Alaska to assess their potential as forage and green manure crops and to evaluate the effects of N fertilizer on legume performance. Herbage yield, crude protein, and total N yield were the criteria used. In addition to previously identified promising species, berseem clover, arrowleaf clover, winter vetch and flatpea consistently produced over 3 t ha−1 of herbage and accumulated over 67 kg N ha−1. Nitrogen fertilizer (90 kg N ha−1) improved yields of arrowleaf clover and winter vetch at Fairbanks (5344 vs. 3685 kg ha−1), but N fertilization depressed yields at Delta Junction. Forage crude protein for the promising species ranged from 120 to 220 g kg−1. Several species exhibited adequate tolerance of low soil pH to be grown on acid soils without liming. Key words: Forage legume crops, Alaska, N fertilization, subarctic
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Lloveras, J., e I. Iglesias. "Morphological development and forage quality changes in crimson clover (Trifolium incarnatum L.)". Grass and Forage Science 56, n.º 4 (dezembro de 2001): 395–404. http://dx.doi.org/10.1046/j.1365-2494.2001.00289.x.
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Whitworth, Julia. "COVER CROPS MAY DECREASE WEED GROWTH IN STRAWBERRY FIELDS". HortScience 30, n.º 3 (junho de 1995): 436b—436. http://dx.doi.org/10.21273/hortsci.30.3.436b.
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The usefulness of cover crops for weed management in strawberries were evaluated. Wheat (Triticum aestevum L.), rye (Secale cereale L.), and crimson clover (Trifolium incarnatum L.) were grown in individual pots then killed by tillage or herbicide and followed in the same pots by plantings of bermuda grass [Cynodon dactylon (L.) Pers.], yellow nutsedge (Cyperus esculentus L.), crabgrass [Digitaria ischaemum (Schreb.) Schreb. ex Muhl.], or strawberries (Fragaria ×ananassa `Cardinal'). Rye and wheat tilled into the medium generally increased the growth of strawberries and decreased the growth of bermuda grass. Rye and wheat residues appeared to suppress growth of weeds and strawberries when the residues remained on the medium surface. Crimson clover had little affect on the growth of weeds or strawberries. Yellow nutsedge and crabgrass were not significantly affected by cover crop residues.
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Dimitrov, Yanko, Nedyalka Palagacheva, Rositsa Mladenova, Plamen Zorovski, Stoyan Georgiev, Zheko Radev, Milena Dimova e Lilko Dospatliev. "Establishment of Grass Strips for Maintaining Biodiversity in Agroecosystems". Journal of Agricultural Science 10, n.º 3 (9 de fevereiro de 2018): 90. http://dx.doi.org/10.5539/jas.v10n3p90.
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Main principle of the common agricultural policy of European Union is achievement of high results with the least possible negative impact on the environment, land protection and efficient use of natural resources. For that purpose, a number of studies are carried out, related to the improvement of biodiversity and protection of the pollinators in the areas of production. Two type of grass mixes were observed: “Laitamag” (Hungary) composed of White mustard (Sinapis alba L.), White clover (Trifolium repens L.), Phacelia (Phacelia tanacetifolia Bentham), Crimson clover (Trifolium incarnatum L.), Egyptian clover (Trifolium alexandrinum L.), Red clover (Trifolium pretense L.), Wild oats (Avena sativa L.), Alfalfa (Medicago sativa L.), Buckwheat (Fagopyrum esculentum Moench) and Sainfoin (Onobrychis viciifolia Scop.) and a mix, proposed by the Agrarian University: White mustard (Sinapis alba L.), White clover (Trifolium repens L.), Phacelia (Phacelia tanacetifolia Bentham), Buckwheat (Fagopyrum esculentum Moench), Coriander (Coriandrum sativum L.). The vegetation of the autumn crops began in March, as the blossoming lasts for 60-63 days, from the beginning of April until 24 June. For the spring sowing (18 March), the flowering of the mixes occurred later, in the second 10-day period of May and ended at the end of June. As a result of the low temperatures during winter, the white mustard, buckwheat and sainfoin plants perished. White clover proves to be the most resilient species.
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Creamer, Nancy G., Mark A. Bennett, Benjamin R. Stinner, John Cardina e Emilie E. Regnier. "Mechanisms of Weed Suppression in Cover Crop-based Production Systems". HortScience 31, n.º 3 (junho de 1996): 410–13. http://dx.doi.org/10.21273/hortsci.31.3.410.
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Field and laboratory studies were conducted to investigate the mechanisms of weed suppression by cover crops. High-performance liquid chromatograph analysis and a seed germination bioassay demonstrated that rye (Secale cereale L.) can be leached of its allelochemicals, redried, and used as an inert control for separating physical suppression from other types of interference. In a field study, rye, crimson clover (Trifolium incarnatum L.), hairy vetch (Vicia villosa Roth.), barley (Hordeum vulgare L.), and a mixture of the four species suppressed the emergence of eastern black nightshade (Solanum ptycanthum Dun.). Crimson clover inhibited the emergence of eastern black nightshade beyond what could be attributed to physical suppression alone. The emergence of yellow foxtail [Setaria glauca (L.) Beauv.] was inhibited by rye and barley but not by the other cover crops or the cover crop mixture.
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Ross, S. M., J. R. King, R. C. Izaurralde e J. T. O’Donovan. "The green manure value of seven clover species grown as annual crops on low and high fertility temperate soils". Canadian Journal of Plant Science 89, n.º 3 (1 de maio de 2009): 465–76. http://dx.doi.org/10.4141/cjps08173.
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Annual and perennial clover species may differ in green manure value. Seven clover (Trifolium) species were grown as annual crops on low fertility (Breton) and high fertility (Edmonton) soils in Alberta. Four annual clovers [balansa (T. michelianum Savi), berseem (T. alexandrinum L.), crimson (T. incarnatum L.), and Persian (T. resupinatum L.)], three perennial clovers [alsike (T. hybridum L.), red (T. pratense L.), and white Dutch (T. repens L.)] and a non-legume reference crop [fall rye (Secale cereale L.)] were ploughed-down as green manure in autumn, and followed by barley (Hordeum vulgare L.). Annual clovers had greater biomass yields than perennial clovers, and berseem clover had the highest yield. At Breton, mean biomass N content was greater for perennial clovers (2.9 g N kg-1) than annual clovers (1.9 g N kg-1). Clover biomass at Breton yielded an average of 77 kg N ha-1, with N derived from the atmosphere averaging 88% by N difference method and 75% by 15N natural abundance method. At Edmonton, the green manures had few effects on soil nitrate and subsequent barley yields. At Breton, all clover green manures except balansa increased barley yields, and grain yields were greater following perennial clovers than annual clovers in one year. Annual clovers will provide forage biomass and add N in areas where rainfall is adequate, and they may be preferable under zero tillage. However there is no advantage of annual clovers, relative to perennial clovers, in terms of N supply.Key words: Green manure, clover, Trifolium species, nitrogen fixation
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Bozhanska, Tatyana, Tsvetoslav Mihovski, Galina Naydenova, Daniela Knotová e Jan Pelikán. "Comparative studies of annual legumes". Biotehnologija u stocarstvu 32, n.º 3 (2016): 311–20. http://dx.doi.org/10.2298/bah1603311b.
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The aim of present study was to get comparative data on forage productivity and quality of forage of Checz cultivars of legumes in the conditions of Northern Bulgaria and respectively to select species and genotypes with the potential for successful introduction in the structure of forage production in Bulgaria. Five species of forage crops were observed and the respective cultivars: Egyptian clover (Trifolium alexandrinum L.), cv. Faraon; crimson clover (Trifolium incarnatum L.), cv. Kardinal; annual bird's-foot-trefoil (Lotus ornithopoides L.) cv. Junak; black medick (Medicago lupulina L.) cv. Ekola and white melilot (Melilotus albus L.), cv. Adela. The studied legumes differed significantly in their fodder productivity. They are ranked in the following order of DM yield: white melilot - black medick - annual bird's-foot-trefoil - Egyptian clover - crimson clover. The productivity and participation of Egyptian clover and crimson clover in grasslands varied significantly in years. The biomass of crimson clover had the highest content of crude protein (15.24%) and the lowest of crude fiber (21.69%) and no digestible components. According to the comprehensive evaluation of data on productivity and forage quality of studied annual legumes, black medick could be defined as the species with the highest potential for cultivation in the conditions of the Central Northern Bulgaria. It is characterised by high productivity of green mass and dry matter, it has regrowing ability, it is distinguished by a high content of crude protein (14.92%) and crude fat (4.66%), optimal content of neutral and acid detergent fibers (34.67 and 24.99%) and with high levels of hemicellulose content (9.68%). Energy value of forage of that species, assessed by means of feed unit of milk (FUM) and growth (FUG) was assessed as very high (FUM - 0.69/kg DM and FUG - 0.63/kg DM).
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Cripps, Reed W., e Herbert K. Bates. "Effect of Cover Crops on Soil Erosion in Nursery Aisles". Journal of Environmental Horticulture 11, n.º 1 (1 de março de 1993): 5–8. http://dx.doi.org/10.24266/0738-2898-11.1.5.
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Abstract The effectiveness of soil erosion control of various vegetative aisle covers was evaluated using Universal Soil Loss Equation (USLE) type plots. ‘Appalow’ sericea lespedeza (Lespedeza cuneata (Dumont) G. Don ‘Appalow’), crimson clover (Trifolium incarnatum L.), and perennial ryegrass (Lolium perenne L.) aisle treatments and a clean till plot were established on a 5% slope Typic Paleudult soil. Previously established ‘Indian Magic’ crabapple (Malus ‘indian magic’) and silver maple (Acer saccharium L.) were grown parallel to the slope in the center of each plot. Runoff from the clean till aisle resulted in the greatest sediment concentration, runoff volume, and sediment runoff. Crimson clover and perennial ryegrass runoff was similar. The ‘Appalow’ lespedeza aisle cover had the highest runoff volume of any vegetative aisle cover. However, runoff sediment concentration and sediment runoff were least from ‘Appalow’ lespedeza covered aisles.
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Kordan, Bożena, Katarzyna Stec, Paweł Słomiński, Marian J. Giertych, Anna Wróblewska-Kurdyk e Beata Gabrys. "Susceptibility of forage legumes to infestation by the pea aphid Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae)". Crop and Pasture Science 69, n.º 8 (2018): 775. http://dx.doi.org/10.1071/cp18065.
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The small-seeded legumes are important forage crops for grazing animals and contribute nitrogen to succeeding crops in crop rotation systems. However, the susceptibility of several of the forage legumes to the specialist pea aphid Acyrthosiphon pisum (Harris) has never been investigated. The present study on aphid probing behaviour using the Electrical Penetration Graph technique revealed that the forage legumes studied were (i) highly acceptable (common vetch Vicia sativa L.), (ii) acceptable (wooly vetch Vicia villosa Roth), (iii) moderately acceptable (fodder galega Galega orientalis Lam., crimson clover Trifolium incarnatum L., Persian clover Trifolium resupinatum L., white clover Trifolium repens L.), (iv) barely acceptable (common bird’s-foot-trefoil Lotus corniculatus L., yellow lucerne Medicago falcata L., alfalfa Medicago sativa L., sand lucerne Medicago × varia Martyn, common bird’s-foot Ornithopus sativus Brot., alsike clover Trifolium hybridum L., red clover Trifolium pratense L., common sainfoin Onobrychis viciifolia Scop.), and (v) unacceptable (white melilot Melilotus albus Medik.) to the pea aphid. On (i) plants, probing occupied 85% of experimental time, all aphids (100%) succeeded in feeding on phloem sap, phloem phase occupied 50% of probing time, sap ingestion periods were long (mean duration: 100.8 ± 28.2 min.) and engaged 97% of the phloem phase. On (ii) plants, probing occupied 73% of exp. time, feeding activity occurred in 66.7% of aphids, phloem phase occupied 30% of probing time, sap ingestion periods were long (mean duration: 115.5 ± 46.7 min) and engaged 80% of the phloem phase. On (iii) plants, probing ranged from 53% of exp. time on T. repens to 70% on T. incarnatum and T. resuspinatum, feeding occurred in 35.3% of aphids on T. resuspinatum up to 54.5% on T. incarnatum, phloem phase occupied 10% of exp. time on G. orientalis, T. incarnatum, and T. resuspinatum and 20% on T. repens, sap ingestion periods were from 9.8 ± 1.8 min. on G. orientalis to 51.9 ± 20.7 min. long on T. resuspinatum and engaged from 30% of phloem phase on G. orientalis to 80% on T. incarnatum. On (iv) plants, probing occupied 25% of exp. time on O. viciifolia up to 38% on O. sativus and T. hybridum, feeding occurred in 6.7% of aphids on T. hybridum to 28% on O. sativus, phloem phase occupied less than 1% of probing time on all plants except O. viciifolia (4%) and O. sativus (5%) and it consisted mainly of salivation. On M. albus (v), probing occupied 22% of experimental time, the probes were short (1.8 ± 0.3 min), and no aphid on M. albus showed feeding on phloem sap. M. albus can be recommended for intercropping, ‘push-pull’ strategies, or as a barrier crop against A. pisum in sustainable agricultural practices.
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St Aime, Ricardo, Enoch Noh, William C. Bridges e Sruthi Narayanan. "A Comparison of Drill and Broadcast Planting Methods for Biomass Production of Two Legume Cover Crops". Agronomy 12, n.º 1 (30 de dezembro de 2021): 79. http://dx.doi.org/10.3390/agronomy12010079.
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The effects of drill and broadcast planting methods on cover crop biomass production depend on various environmental and operational factors. We investigated whether drilling and broadcasting result in different amounts of biomass production by crimson clover (Trifolium incarnatum L.) and hairy vetch (Vicia villosa Roth) in the upstate of South Carolina, and results vary when seeding rates are increased by 50% from the standard value (22.4 kg ha−1). Field trials were conducted during the fall–winter of 2019–2020 (season one) and 2020–2021 (season two) at the Piedmont Research and Education Center in Pendleton, SC, USA. Cover crop (hairy vetch, crimson clover), planting method (broadcast, drill), and seeding rate (standard, high) treatments were arranged as a 2 × 2 × 2 factorial in both years. Aboveground biomass was measured after 22.5 weeks from planting. At standard seeding rates, crimson clover produced a higher biomass when drilled, rather than broadcasted, whereas biomass production did not vary for hairy vetch. Even with 50% higher seeding rates, broadcasting did not always produce the same biomass as that of drilling for crimson clover. Our results suggest that the advantage of drilling over broadcasting depends upon the cover crop species, as crimson clover responds well to drilling, whereas hairy vetch does not.
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Herman, Goran, Ranko Gantner, Vlado Guberac, Helena Žalac e Gordana Bukvić. "Temperature and water solution pH effects on crimson clover (Trifolium incarnatum L.) imbibition and seedling traits". Journal of Central European Agriculture 23, n.º 4 (2022): 749–56. http://dx.doi.org/10.5513/jcea01/23.4.3640.
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Humphries, A. W., S. S. Robinson, D. Hawkey, D. M. Peck, T. D. Rowe, C. T. de Koning e A. Newman. "Diversity for resistance to a moderately virulent bluegreen aphid (Acyrthosiphon kondoi Shinji) population in Trifolium species". Crop and Pasture Science 67, n.º 9 (2016): 1009. http://dx.doi.org/10.1071/cp15102.
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The resistance of a diverse range of Trifolium species (clovers) to a highly virulent bluegreen aphid (BGA, Acyrthosiphon kondoi Shinji) population (Urrbrae 2011) collected in South Australia was assessed in greenhouse and field experiments, with the aims of determining the potential impact of this insect pest on biomass and identifying resistant genotypes for future plant-breeding activities. Resistance to BGA was found in populations of clovers that show some level of outcrossing—white clover (T. repens L.), rose clover (T. hirtum All.), crimson clover (T. incarnatum L.) and red clover (T. pratense L.)—and in one entry of the inbreeding subspecies of subterranean clover, T. subterraneum L. subsp. subterraneum (Katzn. and Morley). Resistance was not found in T. s. brachycalycinum (Katzn. and Morley) or T. s. yanninicum (Katzn. and Morley). In a greenhouse experiment, damage from BGA resulted in forage yield penalties of 72–100% when aphids were inoculated at 14 days after sowing and 13−74% when inoculated at 42 days after sowing, showing that in optimum conditions BGA can be a serious pest of clovers. Observations of severe damage caused by BGA in two regenerating field trials in southern New South Wales confirmed that field damage could occur in seasons favourable to aphid growth and reproduction. The severe damage that BGA can cause to clovers, and the sources of resistance we found, suggest that breeding for BGA resistance in clovers is warranted and feasible.
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Funderburk, Sharon R., e Wanda W. Collins. "EFFECT OF A CRIMSON CLOVER GREEN MANURE ON YIELD AND QUALITY OF SWEET POTATO". HortScience 25, n.º 9 (setembro de 1990): 1157f—1157. http://dx.doi.org/10.21273/hortsci.25.9.1157f.
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Crimson clover Trifolium incarnatum L.) was used as a N source for sweet potato [Ipomoea batatas (L.) Lam.]. Treatments were designed to compare estimated N delivery by clover incorporation amounts of N delivered by inorganic fertilizer. Plants were sampled every 14 days and sectioned into four parts: shoots, stem tips, fibrous and storage roots. Dry matter content was significantly influenced by time. Total plant dry matter was lowest in the highest inorganic N treatment. Nitrogen concentration (DWB) decreased over time and was highest in the highest inorganic N treatment. Similar vine weights were noted in N and clover treatments while number of storage roots per plant was unaffected by treatment as was weight per storage root, which increased linearly over time. No significant difference existed between the high and low N application treatment or late clover incorporation treatment in any grade of storage roots except culls, which were 90% lower in clover treatments than in N fertilizer treatments.
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Siller, Arthur, Heather Darby, Alexandra Smychkovich e Masoud Hashemi. "Winter Malting Barley Growth, Yield, and Quality following Leguminous Cover Crops in the Northeast United States". Nitrogen 2, n.º 4 (8 de outubro de 2021): 415–27. http://dx.doi.org/10.3390/nitrogen2040028.
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There is growing interest in malting barley (Hordeum vulgare L.) production in the Northeastern United States. This crop must meet high quality standards for malting but can command a high price if these quality thresholds are met. A two-year field experiment was conducted from 2015 to 2017 to evaluate the impact of two leguminous cover crops, sunn hemp (Crotalaria juncea L.) and crimson clover (Trifolium incarnatum L.), on subsequent winter malting barley production. Four cover crop treatments—sunn hemp (SH), crimson clover (CC), sunn hemp and crimson clover mixture (SH + CC), and no cover crop (NC)—were grown before planting barley at three seeding rates (300, 350, and 400 seeds m−2). SH and SH + CC produced significantly more biomass and residual nitrogen than the CC and NC treatments. Higher barley seeding rates led to higher seedling density and winter survival. However, the subsequent spring and summer barley growth metrics, yield, and malting quality were not different in any of the treatments. There is much left to investigate in determining the best malting barley production practices in the Northeastern United States, but these results show that winter malting barley can be successfully integrated into crop rotations with leguminous plants without negative impacts on barley growth, yield, and grain quality.
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Kanté, Mohamed, Wassila Riah-Anglet, Jean-Bernard Cliquet e Isabelle Trinsoutrot-Gattin. "Soil Enzyme Activity and Stoichiometry: Linking Soil Microorganism Resource Requirement and Legume Carbon Rhizodeposition". Agronomy 11, n.º 11 (25 de outubro de 2021): 2131. http://dx.doi.org/10.3390/agronomy11112131.
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Legumes provide multiple ecosystem services in agricultural systems. The objectives of this study were to evaluate the influence of different legumes through C rhizodeposition on the dynamics of C, N and P in soil and on microbial communities’ resource requirements. Legumes pea (Pisum sativum L.), faba bean (Vicia faba L.), white clover (Trifolium repens L.), crimson clover (Trifolium incarnatum L.) and non-legume wheat (Triticum aestivum L.) were grown in pots. Carbon rhizodeposition was quantified by using 13CO2 labeling, and six soil enzyme activities were measured: β-glucosidase (BG), arylamidase (ARYLN), N-acetyl-glucosaminidase (NAG), phosphatases (PHO) and alkaline and acid phosphatases (AKP and ACP). Enzyme stoichiometry approaches were applied. The results showed that BG, NAG and ACP activities were positively influenced by faba bean and clovers. Enzyme stoichiometry analysis revealed a limitation of microorganisms in C and P resources at the plant reproductive stage. These results were explained by plant functional traits. Plant biomass production, root total length, the ability of plants to rhizodeposit C and the C and N content of plant tissues were the main explicative factors. This study also shows that N and C nutrient supplies positively contribute to nutritional requirements and the growth of microorganisms and P availability in soil.
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Wells, M. Lenny. "Nitrogen Availability in Pecan Orchard Soil: Implications for Pecan Fertilizer Management". HortScience 46, n.º 9 (setembro de 2011): 1294–97. http://dx.doi.org/10.21273/hortsci.46.9.1294.
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Nitrogen (N) fertilizer application to plants at rates not adjusted for the N contribution from soil N availability may result in overapplication of fertilizer. Further understanding of proper timing of N applications based on soil N dynamics and plant demand can be valuable information for the efficient use of fertilizer N. The present study measures soil N dynamics in a pecan orchard under various N fertilizer regimes on a southeastern U.S. Coastal Plain soil. The following treatments were evaluated: 1) crimson clover (Trifolium incarnatum L.); 2) poultry litter; 3) crimson clover + poultry litter; 4) ammonium nitrate (NH4NO3); and 5) untreated control. Crimson clover provided from 20 to 75 kg·ha−1 N over the course of the two growing seasons; however, most of the available N from crimson clover became available late in the growing season. As a result, supplemental N may be required in spring where crimson clover is used as an orchard cover crop. Poultry litter, with and without clover, provided available N consistently throughout the growing season with more N becoming available later in the season than earlier. This suggests that poultry litter applications for pecan should be timed before budbreak. Under optimum environmental conditions, N from NH4NO3 is most available within the first 30 days of application. Thus, it appears that synthetic fertilizer applications using NH4NO3 as the N source should be targeted at or 2 to 3 weeks after pecan budbreak.
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Foshee, Wheeler G., William D. Goff, Michael G. Patterson e Donald M. Ball. "Orchard Floor Crops Reduce Growth of Young Pecan Trees". HortScience 30, n.º 5 (agosto de 1995): 979–80. http://dx.doi.org/10.21273/hortsci.30.5.979.
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Hairy vetch (Vicia villosa Roth), common vetch (V. sativa L. `Cahaba White'), arrowleaf clover (Trifolium vesiculosum Savi `Yuchi'), crimson clover (T. incarnatum L. `Tibbee'), red clover (T. pratense L. `Redland II'), yellow nutsedge (Cyperus esculentus L.), buckwheat (Fagopyrum sagittatum Gilbert), hairy indigo (Indigofera hirsuta L.), bahiagrass (Paspalum notatum Flugge `Pensacola'), common bermudagrass [Cynodon dactylon (L.) Pers.], and centipedegrass [Eremochloa ophiuroides (Munro) Hack] were grown for 3 years in a 3 × 3-m spacing around young pecan [Carya illinoinensis (Wangenh.) K. Koch] trees. Compared to weed-free plots, all cover crops suppressed tree growth substantially, and there were no differences among cover crops in the degree of suppression. Mean trunk cross-sectional area of weed-free trees increased 26-fold by the end of the third growing season but increased only 13-fold for trees grown with any cover crop. These results suggest that cover crops, if grown in young pecan orchards to promote beneficial insects, should be excluded from the immediate area around the young trees.
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Mantino, Alberto, Vittoria Giannini, Cristiano Tozzini, Enrico Bonari e Giorgio Ragaglini. "The overseeding of two cool-season legumes (Hedysarum coronarium L. and Trifolium incarnatum L.) on switchgrass (Panicum virgatum L.) mature stands increased biomass productivity". Italian Journal of Agronomy 15, n.º 1 (9 de março de 2020): 20–28. http://dx.doi.org/10.4081/ija.2020.1510.
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In the Mediterranean rainfed systems, perennial warm-season grasses are profitable crops for the production of herbage as forage or feedstock for bioenergy purposes. During summer, when the production of cool-season crops is scarce, warm-season grasses can improve the productivity and stability of forage cropping systems. In Italy, switchgrass (Panicum virgatum L.) can be cultivated for herbage production or as energy crop. The objective of this work was evaluating if relay intercropping with cool-season legumes could be suited to convert a mature stand of switchgrass from energy to dual, energy and forage, production, together with improving the productivity and the quality of the harvestable biomass. All these things considered, a field experiment was carried out in Central Italy, on mature stands of two switchgrass varieties, Alamo and Blackwell, overseeded with two legumes: sulla (Hedysarum coronarium L.) and crimson clover (Trifolium incarnatum L.). The intercropping system was compared with fertilized and un-fertilized pure switchgrass stands. After two years of study, data showed that the intercropping increased the total above ground biomass (AGB) productivity. In the second year, the increase in total AGB production for switchgrass mixtures compared with the pure stands was greater for sulla, a biennial legume, than crimson clover.
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Shoup, Sarah Lynn, Russell Brian Muntifering, Mary Kimberly Mullenix, Liliane Severino Silva e Sandra Leanne Dillard. "In Situ Ruminal Digestion, Fermentation Parameters, and Forage Nutritive Value of Cool-Season Baleage Ensiled under Contrasting Inoculant Strategies". Animals 12, n.º 21 (25 de outubro de 2022): 2929. http://dx.doi.org/10.3390/ani12212929.
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In southeastern USA, the use of baleage has increased as an alternative technology to hay production, thereby allowing for a timelier harvest of the conserved forage. A series of studies were conducted to determine the nutritive value, fermentation parameters, and in situ disappearance of the cool-season annual forage mixtures that were ensiled with or without silage inoculant for up to 120 d. The forage mixtures were wheat (Triticum aestivum L.) + brassica hybrid (Brassica rapa L. × napus L.) (WB), wheat + crimson clover (Trifolium incarnatum L.) (WC), and annual ryegrass (Lolium multiflorum Lam.) + oat (Avena sativa L.) + crimson clover (ROC). The inoculant strategy affected the CP concentration (p < 0.05), with it increasing in WB and decreasing in ROC. Among the mixtures, the DM concentration decreased by up to 5%, and the NDF and ADF concentrations decreased by up to 10% during the ensiling period. The pH averaged 5.0, 5.0, and 5.5 for the WC, WB, and ROC mixtures, respectively. Based on our results, the baleage of the cool-season annual forage mixtures may provide a viable high-quality option to sustain animal growth and performance.
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Ambrušec, Ljubica, Ranko Gantner, Goran Herman, Vesna Gantner, Krešimir Bošnjak e Gordana Bukvić. "Green manuring with crimson clover as an alternative to mineral fertilization in maize production". Holistic approach to environment 11, n.º 4 (7 de setembro de 2021): 102–8. http://dx.doi.org/10.33765/thate.11.4.1.
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Role of mineral fertilizers is to complement the soils’ indigenous supply of minerals for crop plants nutrition. Among the mineral nutrients, nitrogen is generally considered as the most yield-contributing. Obtaining nitrogen from legumes is potentially more sustainable than from industrial sources. Crimson clover (Trifolium incarnatum L.) has long been appreciated as cover crop grown for green manuring due to its capability for binding the atmospheric nitrogen into plant-available form. Green manuring effects of crimson clover for succeeding maize crop were tested in 2019 year on two locations of Northeastern Croatia differing in soil texture: 1) on the site A where the soil was compact and dominated by clay and 2) on the site B where the soil was loose and dominated by loam. The research was conducted in a year with favourable rainfall during maize vegetation. Results have shown that green manuring with crimson clover for maize as the main crop delivered somewhat lower maize grain and aboveground mass yields than the conventional full-dose mineral fertilization on deep fertile soils around Osijek (Northeastern Croatia). When compared to conventional agronomy, green manuring was associated with additional agrotechnical operations required for crimson clover cover crop establishment and its herbage incorporation into soil prior to seeding main maize crop. Research should be continued in more different environments (year × location combinations) in order to produce reliable evaluation of crimson clover’s green manuring services.
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Wells, M. Lenny. "Pecan Tree Productivity, Fruit Quality, and Nutrient Element Status using Clover and Poultry Litter as Alternative Nitrogen Fertilizer Sources". HortScience 47, n.º 7 (julho de 2012): 927–31. http://dx.doi.org/10.21273/hortsci.47.7.927.
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The recent increase in the cost of synthetic fertilizer dramatically reduces the profit margin for pecan [Carya illinoinensis (Wangenh.) K. Koch] producers. The objective of this study was to investigate the effects of clover and poultry litter on the orchard soil, horticultural, and nut quality parameters of pecan in the southeastern United States. The following treatments were evaluated; 1) crimson clover (Trifolium incarnatum L.); 2) poultry litter; 3) crimson clover + poultry litter; 4) ammonium nitrate (NH4NO3); and 5) untreated control. Application of poultry litter with or without clover often led to higher soil phosphorous (P) and potassium (K). Poultry litter application with and without clover led to higher leaf P in the final year of study. The recurring low pecan leaf K in the presence of clover without additional K application suggests that K nutrition may be especially important in orchards where clover is used. Clover and/or clover + litter occasionally led to enhanced pecan leaf concentrations of iron (Fe), copper (Cu), and zinc (Zn). Over the course of the study, yields were more consistent from year to year in the clover, litter, and clover + litter treatments, as indicated by the low alternate bearing intensity (I) from 2008 to 2011. Leaf elemental tissue analysis, pecan yield, and quality indicate that poultry litter and clover provide adequate nitrogen (N) nutrition for pecan production.
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Koike, Y., e T. Yuguchi. "EFFECT OF BENZYL ADENINE ON POSTHARVEST QUALITY AND VASE LIFE OF CRIMSON CLOVER (TRIFOLIUM INCARNATUM L.)". Acta Horticulturae, n.º 1012 (novembro de 2013): 435–38. http://dx.doi.org/10.17660/actahortic.2013.1012.55.
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Fraser, J., D. McCartney, H. Najda e Z. Mir. "Yield potential and forage quality of annual forage legumes in southern Alberta and northeast Saskatchewan". Canadian Journal of Plant Science 84, n.º 1 (1 de janeiro de 2004): 143–55. http://dx.doi.org/10.4141/p02-100.
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There is limited information on the adaptability of small and medium-seeded annual legumes in Western Canadian cropping systems. Pea (Pisum spp.), vetch (Vicia, Lathyrus spp.), medic (Medicago spp.), alfalfa (Medicago spp.), berseem clover (Trifolium alexandrinum L.), arrowleaf clover (T. vesiculosum L.), Persian clover (T. resupinatum L.), balansa clover [T. michelianum Savi. var. balansae (Boiss.) Azn.], rose clover (T. hirtum All.), crimson clover (T. incarnatum L.) and black lentil (Lens culinaris Medik.) were grown at Lethbridge and Brooks, Alberta, and at Melfort and Nipawin, Saskatchewan over a 2 or 3 yr period to assess their forage yield potential under irrigation and dryland conditions. Measurements included plant height, stand establishment, flowering date, forage yield and forage quality. Peas, winter and hairy vetch, and berseem clover were the top yielding species across locations (5452–6532 kg ha-1). Berseem clover, hairy vetch, winter vetch, Nitro alfalfa, and Persian clover yielded in excess of 9000 kg ha-1 under irrigation at Brooks. Hairy and winter vetches, Magnus pea, chickling vetch (Lathyrus sativus L.) and berseem clover yielded over 4300 kg ha-1 in dryland and rainfed locations at Lethbridge, Melfort and Nipawin. These entries had an upright growth habit, established quickly and were normally harvested twice. Crude protein concentration and yields were higher in legumes at irrigated locations in Alberta than rainfed locations in central Saskatchewan. Burr medic at the Brooks irrigated location produced the highest crude protein yield of 2495 kg ha-1. Berseem clover, Persian clover, Nitro alfalfa, hairy and winter vetches show promise as legumes in short term rotations, as green manures and intercrops for increasing forage quality in silage or late season grazing in Western Canada. Key words: Medicago, Trifolium, Vicia, Pisum, Lens, forage yield, forage quality
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Teasdale, John R., e Aref A. Abdul-Baki. "Comparison of Mixtures vs. Monocultures of Cover Crops for Fresh-market Tomato Production With and Without Herbicide". HortScience 33, n.º 7 (dezembro de 1998): 1163–66. http://dx.doi.org/10.21273/hortsci.33.7.1163.
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Hairy vetch (Vicia villosa Roth), crimson clover (Trifolium incarnatum L.), and rye (Secale cereale L.) and mixtures of rye with hairy vetch and/or crimson clover were compared for no-tillage production of staked, fresh-market tomatoes (Lycopersicon esculentum Mill.) on raised beds. All cover crops were evaluated both with or without a postemergence application of metribuzin for weed control. Biomass of cover crop mixtures were higher than that of the hairy vetch monocrop. Cover crop nitrogen content varied little among legume monocrops and all mixtures but was lower in the rye monocrop. The C:N ratio of legume monocrops and all mixtures was <30 but that of the rye monocrop was >50, suggesting that nitrogen immobilization probably occurred only in the rye monocrop. Marketable fruit yield was similar in the legume monocrops and all mixtures but was lower in the rye monocrop when weeds were controlled by metribuzin. When no herbicide was applied, cover crop mixtures reduced weed emergence and biomass compared to the legume monocrops. Despite weed suppression by cover crop mixtures, tomatoes grown in the mixtures without herbicide yielded lower than the corresponding treatments with herbicide in 2 of 3 years. Chemical name used: [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one](metribuzin).
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Foote, William, Keith Edmisten, Randy Wells, David Jordan e Loren Fisher. "Cotton Response to Nitrogen Derived from Leguminous Cover Crops and Urea Ammonium Nitrate". Journal of Cotton Science 18, n.º 3 (dezembro de 2014): 367–75. http://dx.doi.org/10.56454/amgt9650.
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The use of legumes as a winter cover crop and green manure for subsequent summer annual crops in the southeastern U.S. has been limited due to relatively inexpensive sources of nitrogen. However, the cost of synthetic nitrogen has nearly tripled in the last 11 years, stimulating growers to reconsider the use of legumes as a cost-effective source of nitrogen. Selecting an appropriate legume species, timing of cover crop termination, and timing of summer crop planting can be adjusted to supply total season nitrogen needs of cotton (Gossypium hirsutum L.) in North Carolina. Crimson clover (Trifolium incarnatum L.) and hairy vetch (Vicia villosa Roth) were used as green manures in cotton as a sole source of nitrogen in field experiments conducted in North Carolina during 2010 and 2011. The highest cotton yield and biomass were noted when cover crops were terminated by a single broadcast herbicide application at 10 days before cotton planting. Lint yield of cotton following crimson clover and hairy vetch equaled lint yield of cotton without cover crops plus 70 kg N ha-1 of liquid urea ammonium nitrate. Net return of the legume cover crop/cotton system equaled net return of the cotton liquid nitrogen system and ranged from 1,240 to 1,650 $ ha-1.
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Skarphol, Brenda J., Kenneth A. Corey e John J. Meisinger. "Response of Snap Beans to Tillage and Cover Crop Combinations". Journal of the American Society for Horticultural Science 112, n.º 6 (novembro de 1987): 936–41. http://dx.doi.org/10.21273/jashs.112.6.936.
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Abstract Field experiments were conducted on a Norfolk loamy sand (fine-loamy, siliceous, thermic Typic Paleudult) from 1983 through 1985 to determine the effects of tillage method, cover crop, and N fertilization on inorganic soil N and yield, yield components, and N content of snap bean (Phaseolus vulgaris L.). Hairy vetch (Vicia villosa Roth), hairy vetch plus wheat (Triticum aestivum L.), Austrian winter pea (Pisum sativum ssp. arvense L. Poir), Austrian winter pea plus wheat, wheat, crimson clover (Trifolium incarnatum L.) and no cover were the cover crop treatments. Inorganic N concentrations generally were greater in soil with cover crop treatments containing legumes than in soil with no cover and wheat treatments. The use of Austrian winter pea, hairy vetch, and crimson clover as cover crops without supplemental N resulted in snap bean yields comparable to those obtained when 90 kg·ha−1 additional N was supplied. Supplemental N decreased the amount of dry matter partitioned into pods. Inorganic N profiles in the soil indicated that conventional tillage (CT) practices resulted in greater mineralization of N fixed by the legume cover crops than no-tillage (NT) practices. However, snap bean yields for NT were comparable to or greater than those obtained with CT, suggesting that N released from legume residues provided sufficient supplemental N for optimum growth and yield.
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Marcinkevičienė, Aušra, Arūnas Čmukas, Rimantas Velička, Robertas Kosteckas e Lina Skinulienė. "Comparative Analysis of Undersown Cover Crops and Bio-Preparations on Weed Spread and Organically Grown Spring Oilseed Rape Yield". Sustainability 15, n.º 18 (12 de setembro de 2023): 13594. http://dx.doi.org/10.3390/su151813594.
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Undersown cover crops are an important tool for weed control in organic farming. The hypothesis of this research was that undersown crimson (incarnate) clover (Trifolium incarnatum Broth.), hairy (winter) vetch (Vicia villosa Roth.), perennial ryegrass (Lolium perenne L.), and winter rye (Secale cereale L.) in combination with bio-preparations inhibit the spread of weeds and influence the seed yield of spring oilseed rape in organic farming. The dry biomass of undersown cover crops, as well as the number and dry biomass of weeds, were determined before harvesting spring oilseed rape (Brassica napus L. spp. oleifera biennis Metzg.) (main crop) to identify the underlying influences on seed yield. We summarized that hairy vetch was distinguished by its rapid growth and by the fact that it produced an aboveground dry biomass that was significantly higher (1.9 to 12.4 times) compared with other cover crops, while crimson clover grown as a cover crop had a significantly higher aboveground dry biomass (by a factor of 3.2 to 4.9) compared with that of perennial ryegrass and winter rye. During the spring oilseed growing season, undersown cover crops did not suppress early emerging weeds that had not been controlled by inter-row loosening. During the spring growing season, weeds were best suppressed using bio-preparation-treated perennial ryegrass. The highest oilseed rape seed yield was obtained in 2020 after the application of bio-preparations in plots without any cover crops. Perennial ryegrass as a cover crop in combination with bio-preparations produced the highest reduction in oilseed rape seed yield. Further research should be directed toward determining the long-term effects of cover crops and bio-preparations on plant community formation in organic farming.
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Marcinkevičienė, Aušra, Arūnas Čmukas, Rimantas Velička, Robertas Kosteckas e Lina Skinulienė. "Effects of Biopesticides and Undersown Cover Crops on Soil Properties in the Organic Farming System". Agronomy 12, n.º 9 (10 de setembro de 2022): 2153. http://dx.doi.org/10.3390/agronomy12092153.
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The inclusion of undersown cover crops in crop rotations and the use of biopesticides are essential for the long-term sustainability of the agroecosystem in organic farming. We hypothesized that biopesticides and undersown cover crops (crimson (incarnate) clover (Trifolium incarnatum Broth.), hairy (winter) vetch (Vicia villosa Roth.), perennial ryegrass (Lolium perenne L.), and winter rye (Secale cereale L.)) are likely to have a positive impact on soil agrophysical and biological properties. Soil shear strength, soil aggregate–size distribution, plant root dry biomass and number and biomass of earthworms were determined at the end of the plant growing season. We concluded that the application of biopesticides and growing of undersown cover crops decreased soil shear strength and increased the percentage of macro-aggregates (0.25–10 mm) in the plough layer. In the plots with cover crops, plant root biomass was found to be significantly higher by a factor of 1.9 to 3.5, compared to the plots without cover crops. The application of biopesticides and undersown cover crops did not significantly affect the number and biomass of earthworms in the soil. The abundance of earthworms was more influenced by meteorological conditions.
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Wells, M. Lenny. "Response of Pecan Orchard Soil Chemical and Biological Quality Indicators to Poultry Litter Application and Clover Cover Crops". HortScience 46, n.º 2 (fevereiro de 2011): 306–10. http://dx.doi.org/10.21273/hortsci.46.2.306.
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Little information is available regarding the activity of soil quality biological indicators in southeastern U.S. pecan [Carya illinoinensis (Wangenh.) K. Koch] orchards. The objectives of this study were to examine the effect of poultry litter application and the use of crimson clover (Trifolium incarnatum L.) as a cool-season cover crop on soil chemistry and soil quality biological indicators, including mycorrhizal inoculum potential (MIP), microbial biomass carbon (MBC), and phosphatase activity in a southeastern U.S. Coastal Plain pecan orchard system. The use of clover as a cool-season cover crop between tree rows provided multiple benefits for pecan orchard soil quality, including increased MIP and MBC. Soil phosphatase activity was also enhanced by clover during two of the three years of study. Soil elemental properties, including total nitrogen (N), and soil organic matter (SOM) were also enhanced by clover and/or poultry litter, although there was an obvious time lag in the response of soil N to the treatments. Poultry litter application increased soil phosphorus (P) but did not consistently enhance soil biological activity parameters. At times, poultry litter appeared to neutralize or minimize the positive effects of clover on MIP.
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Creamer, Nancy G., Mark A. Bennett e Benjamin R. Stinner. "Evaluation of Cover Crop Mixtures for Use in Vegetable Production Systems". HortScience 32, n.º 5 (agosto de 1997): 866–70. http://dx.doi.org/10.21273/hortsci.32.5.866.
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Planting polyculture mixtures of cover crops can optimize the benefits of their use. Thirteen polyculture mixtures of cover crops were evaluated in Columbus and Fremont, Ohio, to find a species mix that would establish quickly for erosion control, overwinter in Ohio, contribute sufficient N and have a C : N ratio between 20:1 and 30:1 to optimize N availability for subsequent crops, be killable by mechanical methods, and have high weed control potential. All of the mixtures in Columbus had achieved 30% ground cover 1 month after planting, but only four of the mixtures achieved this in Fremont due to poor conditions at planting. Above-ground biomass (AGB) accumulation in the mixtures ranged from 3631 to 13,642 kg·ha-1 in Columbus, and 449 to 12,478 kg·ha-1 in Fremont. Nitrogen in the AGB ranged from 74 to 269 kg·ha-1 in Columbus, and 10 to 170 kg·ha-1 in Fremont. Weed cover in the cover crop plots ranged from 1% to 91% eight weeks after cover crop kill in Columbus, and 12% to 90% seven weeks after cover crop kill in Fremont. Because one or more species in each screened mixture was determined not to be suitable, none of the mixtures was optimum. However, information gained about performance of individual species within the mixtures is also useful. `Nitro' alfalfa (Medicago sativa L.), ladino clover (Trifolium repense L.), subterranean clover (Trifolium subterraneum L.), Austrian winter peas [Pisum sativum ssp. Arvense (L.) Poir], and annual ryegrass (Lolium multiflorum Lam.) did not overwinter dependably in Ohio. Tall fescue (Festuca arundinacea L.), perennial ryegrass (Lolium perenne L.), and orchardgrass (Dactylis glomerata L.) did not compete well with taller, more vigorous species, and were not persistent in the mixtures. Medium and mammoth red clover (Trifolium pratense L.), annual and perennial ryegrass, and white and yellow blossom sweetclover [Melilotus alba Desr., and Melilotus officianalis (L). Desr.], were not killable by mechanical methods. Individual species that established quickly, were competitive in the mixtures, overwintered dependably, and were killed by mechanical methods were rye (Secale cereale L.), barley (Hordeum vulgare L.), crimson clover (Trifolium incarnatum L.), and hairy vetch (Vicia villosa Roth.)
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Abdul-Baki, Aref A., J. R. Teasdale, R. Korcak, D. J. Chitwood e R. N. Huettel. "Fresh-market Tomato Production in a Low-input Alternative System Using Cover-crop Mulch". HortScience 31, n.º 1 (fevereiro de 1996): 65–69. http://dx.doi.org/10.21273/hortsci.31.1.65.
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A low-input sustainable agricultural system for the production of staked, fresh-market field tomatoes (Lycopersicon esculentum Mill.) is described. The system uses winter annual cover crops to fix N, recycle leftover nutrients, produce biomass, and prevent soil erosion throughout the winter and spring. Yields of tomato plants grown in hairy vetch (Vicia villosa Roth), crimson clover (Trifolium incarnatum L.), and rye (Secale cereale L.) plus hairy vetch mulches were higher than those grown in the conventional black polyethylene (BP) mulch system in 2 of 3 years. Fruit were heavier with the plant mulches than with BP mulch. Eight weeks after transplanting, N levels in tomato leaves were higher with plant than with BP mulch, although the plant mulch plots received only 50% of the N applied to the BP plots. The cover crops had no effect on populations of five phytoparasitic nematode species.
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Sainju, U. M., B. P. Singh e W. F. Whitehead. "Cover crops and nitrogen fertilization effects on soil carbon and nitrogen and tomato yield". Canadian Journal of Soil Science 80, n.º 3 (1 de agosto de 2000): 523–32. http://dx.doi.org/10.4141/s99-107.
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Cover crops can influence soil properties and crop yield. We examined the influence of legume [hairy vetch (Vicia villosa Roth) and crimson clover (Trifolium incarnatum L.)] and nonlegume [rye (Secale cereale L.)] cover crops and N fertilization (0, 90, and 180 kg N ha−1) on the short- and long-term effects on soil C and N and tomato yield and N uptake. We measured organic C and N (long-term effects), potential C and N mineralization (PCM and PNM) and inorganic N (short-term effects) periodically on a Greenville fine sandy loam (fine-loamy, kaolinitic, thermic, Rhodic Kandiudults) planted with tomato (Lycopersicum esculentum Mill) from April to August in 1996 and 1997 in Georgia USA. Soil C and N concentrations increased early in the growing season with cover crop residue incorporation, but decreased as the residue decomposed. Rye increased organic N and maintained greater levels of organic C and PCM after 3 yr than other treatments. In contrast, hairy vetch and crimson clover increased PNM and inorganic N soon after residue incorporation into the soil and produced tomato yield and N uptake similar to that produced by 90 and 180 kg N ha–1. Nitrogen fertilization increased PNM and inorganic N after split application and tomato yield and N uptake but decreased organic C and N and PCM compared with rye. Compared with 0 kg N ha–1, nonlegume cover crops, such as rye can increase organic C and N and PCM but legume cover crops, such as hairy vetch and crimson clover, can enrich soil N and produce tomato yield and N uptake similar to that produced by 90 and 180 kg N ha−1. Key words: Cover crops, nitrogen fertilization, soil carbon, soil nitrogen, tomato yield
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Sandanayaka, W. R. Manoharie, Vicky A. Davis e Linley K. Jesson. "Mealybug preference among clover cultivars: testing potential groundcover plants to dissociate mealybugs from grapevines". New Zealand Plant Protection 71 (29 de julho de 2018): 248–54. http://dx.doi.org/10.30843/nzpp.2018.71.138.
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The choice of groundcover plants used under grapevines may reduce the quantity of mealybugs found on grapevines in New Zealand vineyards. Preferences of Pseudococcus calceolariae and P. longispinus mealybugs on five clover cultivars were tested under ‘no-choice’ and ‘choice’ conditions. Two plants of each cultivar: ‘Karridale’(KS) (Trifolium subterraneum, L.), ‘Tripoli’ (TW), ‘Nomad’ (N) (T. repens), ‘Crimson cv’ (C) (T. incarnatum) and ‘Strawberry cv’ (S) (T. fragiferum) grown in pots, were arranged in randomised designs for the no-choice and choice tests and inoculated with newly emerged mealybugs. In the no-choice test, significantly more mealybugs (either species) were observed on KS and C than on TW, N, or S plants after 21 days. In the choice test, significantly more P. calceolariae were observed on KS than on TW, N, or S, while mealybug numbers on C were intermediate. Numbers of P. longispinus were significantly higher on KS and C than on TW, N or S. Mealybugs demonstrated preferences for KS and C over TW, N or S. These findings could aid development of recommendations for groundcover management in vineyards.
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Tyler, Heather L. "Single- versus Double-Species Cover Crop Effects on Soil Health and Yield in Mississippi Soybean Fields". Agronomy 11, n.º 11 (18 de novembro de 2021): 2334. http://dx.doi.org/10.3390/agronomy11112334.
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Conservation management practices can improve soil health while minimizing deleterious effects of agriculture on the environment. However, adoption of these practices, particularly cover crops, is not widespread, as they often reduce crop yields compared to traditional management practices. The purpose of the current study was to determine if a two-species cover crop treatment of rye (Secale cereale L.) and crimson clover (Trifolium incarnatum L.) could increase soil health parameters and maximize soybean (Glycine max L.) yield greater than rye only in tilled and no-till Mississippi field soils. Enhanced microbial biomass and organic matter input from cover crops increased the activities of β-glucosidase, cellobiohydrolase, fluorescein diacetate hydrolysis, N-acetylglucosaminidase, and phosphatase in surface soils. Rye plus clover tended to elicit higher activities than rye only in no-till plots. Both cover crop treatments inhibited soybean yield in tilled plots by 11–25%. These results indicate that tillage exacerbates yield inhibition by cover crops in soybean and that double-species cover crop treatments were more consistent in increasing activities linked to nutrient cycling. Further study examining different combinations of cover crops in no-till systems is necessary to gain a better understanding of how they can be implemented to enhance soil health while maximizing crop yield.
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Kaakeh, Walid, e James D. Dutcher. "Population Parameters and Probing Behavior of Cowpea Aphid (Homoptera: Aphididae), on Preferred and Non-Preferred Host Cover Crops". Journal of Entomological Science 28, n.º 2 (1 de abril de 1993): 145–55. http://dx.doi.org/10.18474/0749-8004-28.2.145.
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Developmental time, fecundity, nymphal mortality, generation time, intrinsic and finite rates of increase, and time for population to double were compared for cowpea aphid, Aphis craccivora Koch, reared on cover crop seedlings of sesbania, Sesbania exaltata (Rafinesque-Schmaltz) Cory; cowpea, Vigna unguiculata [L.] Walpers; hairy indigo, Indigofera hirsuta L.; hairy vetch, Vicia villosa Roth; crimson clover, Trifolium incarnatum L.; and cereal rye, Secale cereale L. The study was conducted under near-ambient temperatures in a greenhouse from late January to mid-April. Developmental, pre-reproductive, and generation times of A. craccivora were the shortest on V. unguiculata, followed by S. exaltata and I hirsuta. However, mean total fecundity, fecundity rate, and intrinsic and finite rates of increase were higher on V. unguiculata and I. hirsuta than on the other species. No differences in life parameters were detected when A. craccivora developed on the same plant species at different evaluation periods. Probing behavior of individual A. craccivora differed on various cover crops. Mean probe duration was longer on V. unguiculata and I. hirsuta, but time to start the first probe, number of probes per access period, and non-probing duration were shorter than on other plant species evaluated.
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Li, Hanxia, Nicholas Hill e Jason Wallace. "A perennial living mulch system fosters a more diverse and balanced soil bacterial community". PLOS ONE 18, n.º 8 (29 de agosto de 2023): e0290608. http://dx.doi.org/10.1371/journal.pone.0290608.
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Cover crops are known to positively impact soil health, both at a physical level (through erosion control and organic matter enhancement) and at a biological level (by fostering more diverse microbial communities). However, most research in this area has been conducted in the context of annual cover crops that are terminated when the main crop is planted. We have previously demonstrated that a continuous “living mulch” cover crop system can enhance the physical and chemical aspects of soil health; In this study, we reveal its effect on the soil bacterial community and compare it to two different annual cover crops and a conventional control without cover crops. We examined the effect of a living-mulch (LM) system using perennial white clover (Trifolium pratense L), annual cereal rye (Secale cereale L.) (CR), annual crimson clover (Trifolium incarnatum L.) (CC), and a no-cover (NC) control at three time points during the 2018 growing season. 16S rRNA amplicon analysis of the soil bacterial community revealed that the community composition in cover crop systems was significantly different from the NC control, and that LM and CR accommodated more heterogeneous and even bacterial communities compared to the NC control. The difference in bacterial composition between cover crop systems appears to be partly influenced by soil nitrogen concentration and lime buffer capacity. Overall community diversity was associated with nitrogen and metal ion concentrations, and these associations were both stronger and more numerous later in the season. These results elucidate how a perennial cover crop system affects the soil bacterial community and advance our understanding of the interactions between crops, management practices, and soil microbiomes in sustainable agriculture.
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Kuppusamy, Palaniselvam, Dahye Kim, Ilavenil Soundharrajan, Hyung Soo Park, Jeong Sung Jung, Seung Hak Yang e Ki Choon Choi. "Low-Carbohydrate Tolerant LAB Strains Identified from Rumen Fluid: Investigation of Probiotic Activity and Legume Silage Fermentation". Microorganisms 8, n.º 7 (14 de julho de 2020): 1044. http://dx.doi.org/10.3390/microorganisms8071044.
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The objective of this study was to isolate and characterize lactic acid bacteria (LAB) with low carbohydrate tolerance from rumen fluid and to elucidate their probiotic properties and the quality of fermentation of Medicago sativa L. and Trifolium incarnatum L. silage in vitro. We isolated 39 LAB strains and screened for growth in MRS broth and a low-carbohydrate supplemented medium; among them, two strains, Lactiplantibacillus plantarum (Lactobacillus plantarum) RJ1 and Pediococcus pentosaceus S22, were able to grow faster in the low-carbohydrate medium. Both strains have promising probiotic characteristics including antagonistic activity against P. aeruginosa, E. coli, S. aureus, and E. faecalis; the ability to survive in simulated gastric-intestinal fluid; tolerance to bile salts; and proteolytic activity. Furthermore, an in vitro silage fermentation study revealed that alfalfa and crimson clover silage inoculated with RJ1 and S22 showed significantly decreased pH and an increased LAB population at the end of fermentation. Also, the highest lactic acid production was noted (p < 0.05) in LAB-inoculated silage vs. non-inoculated legume silage at high moisture. Overall, the data suggest that RJ1 and S22 could be effective strains for fermentation of legume silage.
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Nelson, Wendy A., Brian A. Kahn e B. Warren Roberts. "Screening Cover Crops for Use in Conservation Tillage Systems for Vegetables Following Spring Plowing". HortScience 26, n.º 7 (julho de 1991): 860–62. http://dx.doi.org/10.21273/hortsci.26.7.860.
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Several prospective cover crops were sown into 1-m2 monoculture plots on 9 Mar. 1987 and 10 Mar. 1988 at Bixby, Okla., and on 14 Mar. 1988 at Lane, Okla., after sites were plowed and fitted. Densities and dry weights of cover crops and weeds were determined in late April or early May of both years. Plots also were evaluated for degree of kill by glyphosate in 1988. Fourteen cover crops were screened at Bixby in 1987. Kentucky bluegrass (Poa pratensis L.) and three fescues (Festuca rubra L., Festuca rubra L. var. commutata Gaud.-Beaup., and Festuca elatior L.) were eliminated from further consideration due to inadequate cover density and inability to suppress weeds. Screenings of the 10 remaining covers were conducted at both locations in 1988. Annual ryegrass (Lolium multiflorum L.) and three small grains [rye (Secale cereale L.), barley (Hordeum vulgare L.), and wheat (Triticum aestivum L.)] were the most promising cover crops with respect to cover density, competitiveness against weeds, and degree of kill by glyphosate. Crimson clover (Trifolium incarnatum L.) and hairy vetch (Vicia villosa Roth) were the most promising legumes, but they generally were less satisfactory than the grassy covers in all tested aspects. A single application of glyphosate was ineffective in killing hairy vetch at both locations. Chemical name used: N-(phosphonomethyl)glycine (glyphosate).
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Cho, Hyeon-Suk, Myung-Chul Seo, Tea-Sun Park, Jun-Hwan Kim, Wan-gyu Sang, Pyeong Shin e Geon Hwi Lee. "The Effect of Soil Textures on the Flowering characteristics and Green Manure Yield of Crimson Clover (Trifolium incarnatum L.) in Upland Soil". Korean Journal of Soil Science and Fertilizer 49, n.º 6 (31 de dezembro de 2016): 705–11. http://dx.doi.org/10.7745/kjssf.2016.49.6.705.
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Bracey, Weston M., Virginia R. Sykes, Xinhua Yin, Gary E. Bates, David M. Butler, David W. McIntosh e Allison R. Willette. "Forage Yield, Quality, and Impact on Subsequent Cash Crop of Cover Crops in an Integrated Forage/Row Crop System". Agronomy 12, n.º 5 (18 de maio de 2022): 1214. http://dx.doi.org/10.3390/agronomy12051214.
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Dual-use cover crops as forage for livestock could offer ecological and economic benefits when incorporated into rotations with corn (Zea mays L.) and soybean (Glycine max (L.) Merr) in the Mid-South USA; however, information on implementation and impact is limited. A factorial of sixteen cool-season species and a no-cover control by two management systems (forage harvest and residue left in the field) was repeated under two cover crop planting/termination timings: long-season (Oct. through May; corn/cover-crop/soybean) and short-season (Nov. through Apr.; soybean/cover-crop/corn), two locations (Spring Hill and Knoxville, TN), and two growing seasons (2017/2018 and 2018/2019). Data were analyzed using a mixed model ANOVA (SAS 9.4.). The forage biomass did not differ by species within the short-season (415 to 1583 kg ha−1) but did in the long-season (475 to 4282 kg ha−1). Within the long-season, crimson clover (Trifolium incarnatum L.) and winter pea (Pisum sativum subsp. arvense (L.)) had crude protein and acid detergent fiber values within the range for prime forage and were among the highest biomasses. The forage harvest did not negatively affect soil properties or succeeding crop yield and quality. If appropriate species are selected, cover crops within a corn/cover-crop/soybean rotation can provide quality forage, without reducing the short term ecological benefits.
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Bressler, Alison, e Jennifer Blesh. "Episodic N2O emissions following tillage of a legume–grass cover crop mixture". Biogeosciences 19, n.º 13 (6 de julho de 2022): 3169–84. http://dx.doi.org/10.5194/bg-19-3169-2022.
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Abstract. Nitrogen (N) fertilizer inputs to agricultural soils are a leading cause of nitrous oxide (N2O) emissions. Legume cover crops are an alternative N source that can reduce agricultural N2O emissions compared to fertilizer N. However, our understanding of episodic N2O flux following cover crop incorporation by tillage is limited and has focused on single-species cover crops. Our study explores whether increasing cover crop functional diversity with a legume–grass mixture can reduce pulse emissions of N2O following tillage. In a field experiment, we planted crimson clover (Trifolium incarnatum L.), cereal rye (Secale cereal L.), a clover–rye mixture, and a no-cover control at two field sites with contrasting soil fertility properties in Michigan. We hypothesized that N2O flux following tillage of the cover crops would be lower in the mixture and rye compared to the clover treatment because rye litter can decrease N mineralization rates. We measured N2O for approximately 2 weeks following tillage to capture the first peak in N2O emissions in each site. Across cover crop treatments, the higher-fertility site, CF, had greater cover crop biomass, 2-fold-higher aboveground biomass N, and higher cumulative N2O emissions than the lower-fertility site, KBS (413.4±67.5 vs. 230.8±42.5 g N2O-N ha−1; P=0.004). There was a significant treatment effect on daily emissions at both sites. At CF, N2O fluxes were higher following clover than the control 6 d after tillage. At KBS, fluxes from the mixture were higher than rye 8 and 11 d after tillage. When controlling for soil fertility differences between sites, clover and mixture led to approximately 2-fold-higher N2O emissions compared to rye and fallow treatments. We found partial support for our hypothesis that N2O would be lower following incorporation of the mixture than clover. However, treatment patterns differed by site, suggesting that interactions between cover crop functional types and background soil fertility influence N2O emissions during cover crop decomposition.
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Gebremedhin, Maheteme, Sait Sarr, Mark Coyne, Karamat R. Sistani e Jason Simmons. "The Combined Influence of Cover Crops and Manure on Maize and Soybean Yield in a Kentucky Silt Loam Soil". Sustainability 11, n.º 21 (31 de outubro de 2019): 6058. http://dx.doi.org/10.3390/su11216058.
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Management that degrades soil can be one of the main causes of low agricultural productivity and environmental problems in many agricultural regions. There is renewed interest in soil conservation practices to promote sustainable agriculture by improving soil quality and productivity. In this study, the short-term on-farm benefits of cover crops and manure on crop yield and biomass were examined during two consecutive growing seasons. The experiment was conducted at a small-producer farm in Logan County, Kentucky, USA. Soybean (Glycine max L.) and maize (Zea mays L.) were used as summer annual rotation crops in no-tilled soils. A cover crop mix of cereal rye (Secale cereale L.), Austrian winter pea (Pisum sativum L.), and crimson clover (Trifolium incarnatum L.) was planted after the main crop was harvested each year. Aboveground biomass of the soybean and maize were assessed, and yield was estimated from hand-harvested plants. In the first year of the study (2016), there were apparent but not significant beneficial effects of animal manure and cover crops on soybean yield, but not on biomass. The biomass and maize grain yield in the second year (2017) were detectable, significant, and increased as a result of the cover crops and manure application (p < 0.05). While beneficial effects of combining cover crops and manure may not be obvious in the first year of a rotation, they can be apparent in subsequent years. However, longer-term observation and measurement are necessary to better quantify the relationship between sustainable conservation practices and productivity.
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Panth, Milan, Fulya Baysal-Gurel, Terri Simmons, Karla M. Addesso e Anthony Witcher. "Impact of Winter Cover Crop Usage in Soilborne Disease Suppressiveness in Woody Ornamental Production System". Agronomy 10, n.º 7 (10 de julho de 2020): 995. http://dx.doi.org/10.3390/agronomy10070995.
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Diseases caused by soilborne pathogens are a major limitation to field grown nursery production. The application of cover crops for soilborne disease management has not been widely investigated in a woody ornamental nursery production system. The objective of this study was to explore the impact of winter cover crops usage on soilborne disease management in that system. Soils from established field plots of red maple (Acer rubrum L.) with and without winter cover crops (crimson clover (Trifolium incarnatum L.) or triticale (× Triticosecale W.)) were sampled following the senescence of the cover crops. Separate bioassays were performed using red maple cuttings on inoculated (with Phytopythium vexans, Phytophthora nicotianae or Rhizoctonia solani) and non-inoculated field soils. The results indicated that winter cover crop usage was helpful for inducing soil disease suppressiveness. There was lower disease severity and pathogen recovery when the cover crops were used compare to the non-cover cropped soil. However, there were no differences in maple plant fresh weight and root weight between the treatments. The rhizosphere pseudomonad microbial population was also greater when the cover crops were used. Similarly, the C:N ratio of the soil was improved with the cover crop usage. Thus, in addition to improving soil structure and reducing erosion, cover crops can provide improved management of soilborne diseases. Therefore, stakeholders can consider cover crop usage as an alternative sustainable management tool against soilborne diseases in field nursery production system.
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Price, Duzy, McElroy e Li. "Evaluation of Organic Spring Cover Crop Termination Practices to Enhance Rolling/Crimping". Agronomy 9, n.º 9 (6 de setembro de 2019): 519. http://dx.doi.org/10.3390/agronomy9090519.
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With organic farming hectarage and cover crop interest increasing throughout the United States, effectively timed cover crop termination practices are needed that can be utilized in organic conservation tillage production systems. Four commercially available termination treatments approved by Organic Materials Review Institute (OMRI) were evaluated, immediately following mechanical termination with a cover crop roller/crimper and compared to a synthetic herbicide termination to access termination rates. Treatments included rolling/crimping followed by (1) 20% vinegar solution (28 L a.i. ha−1 acetic acid), (2) 2.5 L a.i. ha−1 45% cinnamon (Cinnamomum verum L.) oil (cinnamaldehyde, eugenol, eugenol acetate)/45% clove oil (eugenol, acetyl eugenol, caryophyllene) mixture, (3) 0.15 mm clear polyethylene sheeting applied with edges manually tucked into the soil for 28 days over the entire plot area (clear plastic), (4) broadcast flame emitting 1100 °C applied at 1.2 k/h (flame), (5) glyphosate applied at 1.12 kg a.i. ha−1 (this non-OMRI-approved, non-organic conservation tillage cover crop termination standard practice was included to help ascertain desiccation, regrowth, and economics), and (6) a non-treated control. Five cover crop species were evaluated: (1) hairy vetch (Vicia villosa Roth), (2) crimson clover (Trifolium incarnatum L.), (3) cereal rye (Secale cereale L.), (4) Austrian winter pea (Pisum sativum L.), and (5) rape (Brassica napus L.). Three termination timings occurred at four-week intervals beginning mid-March each year. In April or May, organic producers are most likely to be successful using a roller crimper as either a broadcast flamer for terminating all winter covers evaluated, or utilizing clear plastic for hairy vetch, winter peas, and cereal rye. Ineffectiveness and regrowth concerns following cover crop termination in March are substantial. Commercially available vinegar and cinnamon/clove oil solutions provided little predictable termination, and producers attempting to use these OMRI-approved products will likely resort to cover crop incorporation, or mowing, to terminate covers if no other practice is readily available.