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1
Njoroge, J. M. "Weeds and Weed Control in Coffee". Experimental Agriculture 30, n.º 4 (outubro de 1994): 421–29. http://dx.doi.org/10.1017/s0014479700024662.
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SUMMARYThe effects of weeds on coffee productivity and the methods used for their control are discussed. The more common weeds are listed, together with the control methods that can be used at various phases of coffee production.Malezas y control de las mismas en el café
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Lueschen, William E., e Thomas R. Hoverstad. "Imazethapyr for Weed Control in No-Till Soybean (Glycine max)". Weed Technology 5, n.º 4 (dezembro de 1991): 845–51. http://dx.doi.org/10.1017/s0890037x00033960.
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Lack of consistent weed control has been a major limiting factor in the adoption of no-till soybean production. Field studies were conducted at Waseca, MN from 1987 through 1990 to evaluate the efficacy of imazethapyr applied either alone or in combination with other herbicides for weed control in no-till soybean. Fall applications of imazethapyr did not provide acceptable weed control. Imazethapyr applied 2 to 4 wk before planting provided a weed-free seedbed whereas burndown treatments applied 1 to 3 d before planting failed to do so. Early preplant imazethapyr applied during the second week of April did not control weeds as well as imazethapyr applied during the last week of April. Imazethapyr applied alone PRE failed to control weeds adequately. A split application of early preplant plus PRE imazethapyr resulted in excellent weed control, especially when metribuzin was added with each application. Imazethapyr is a promising herbicide for weed control in no-till soybean production.
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Hamada, Azhari Abdelazim. "Weeds and Weed Control Methods in Sudan". Journal of Weed Science and Technology 45, Supplement (2000): 12–13. http://dx.doi.org/10.3719/weed.45.supplement_12.
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Shahbazi, Saeed, Marjan Diyanat, Sareh Mahdavi e Soheida Samadi. "Broadleaf weed control in rain-fed chickpea". Weed Technology 33, n.º 5 (13 de agosto de 2019): 727–32. http://dx.doi.org/10.1017/wet.2018.40.
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AbstractWeeds are among the main limitations on chickpea production in Iran. The efficacy of herbicide treatments including linuron PPI, imazethapyr PPI, PRE, and POST, pendimethalin PPI and POST, bentazon POST, pyridate POST, and oxadiazon POST along with one or two hand weedings were evaluated for weed control and yield response in rain-fed chickpea in Aleshtar, Lorestan, Iran in 2015 and 2016. Wild safflower, threehorn bedstraw, wild mustard, and hoary cress were the predominant weed species in both experimental years. Total weed dry biomass in weedy check plots averaged 187 and 238 g m−2 in 2015 and 2016, respectively, and weed density and biomass were reduced in all treatments compared to the weedy check in both years. Treatments composed of pyridate followed by one hand weeding or imazethapyr POST followed by two hand weedings resulted in the lowest weed biomass. The presence of weeds reduced yield by 74% and 66% in the weedy check plots compared to the weed-free control plots in 2015 and 2016, respectively. Application of oxadiazon, bentazon, and imazethapyr PPI, PRE, and POST resulted in lower chickpea yields. All herbicides tested injured chickpea slightly, with pyridate causing the least injury.
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Hoover, Emily E., Frank Forcella, Neil Hansen, Steve Poppe e Faye Propsom. "410 Biologically Based Weed Control in Strawberry". HortScience 35, n.º 3 (junho de 2000): 463E—464. http://dx.doi.org/10.21273/hortsci.35.3.463e.
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Lack of effective weed control is the major limiting factor in strawberry production. With few herbicides labeled for use in this perennial crop, weeds are controlled using manual labor, cultivation, and one or two herbicide applications. However, these practices do not provide long-term, effective weed control, and weeds continue to be the number one reason why strawberry fields are removed from production due to a reduction in yield. The objective of this study was to evaluate weed control during strawberry plant establishment using woven woolen mats and spring-sown canola. The effects of these mulches on weed control and strawberry plant production were studied independently and in tandem. Weed and daughter plant counts were compared among treatments to test for differences. Wool mulch, both single- and two-ply, was an effective barrier to weeds within the strawberry rows. Planting canola between rows or broadcasting in combination with the wool mulch decreased the number of weeds when compared to other treatments. The four treatments that included wool had the highest number of rooted daughter plants when compared to all the other treatments except the weed-free plot. The canola treatments without wool mulch did not produce as many rooted daughter plants and were not statistically different from the weedy-check.
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Ellis, P. R. "Weeds —influences of weed vegetation in ipm and non-chemical weed control". Phytoparasitica 20, S1 (março de 1992): S71—S75. http://dx.doi.org/10.1007/bf02980412.
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Šikuljak, Danijela, Ana Anđelković, Snežana Janković, Dragana Marisavljević, Sanja Đurović e Sava Vrbničanin. "Weeds in apple orchards and their control". Biljni lekar 50, n.º 6 (2022): 601–12. http://dx.doi.org/10.5937/biljlek2206601s.
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Floristic composition of the weed community in apple orchards differs, depending on the type of management - extensive or intensive. In extensive orchards, weedy-ruderal-grassland species are dominant. On the other hands, in intensive orchards the inter-row can be dominated by annual (therophyte) weed species, if mechanically cultivated, or grass species, if grasses are used as cover crops, while the rows are dominated by perennial weed species (geophytes, hemicryptophytes). The floristic composition of the weed communities is also dependent on the age of the orchard. In younger orchards row crop weeds are dominant, while as the orchard ages, the community gets a more weedy-ruderal-grassland character. The most common weed species in apple orchards in Serbia are: Amaranthus retroflexus, Ambrosia artemisiifolia, Chenopodium album, Convolvulus arvensis, Carduus acanthoides, Cynodon dactylon, Erigeron canadensis, Hordeum murinum, Lamium purpureum, L. amplexicaule, Medicago lupulina, Setaria spp., Stellaria media, Stenactis annua, Sonchus arvensis, Taraxacum officinale, Veronica spp. and Vicia spp. Weed control in apple orchards can be done using agrotechnical (soil cultivation), physical (mowing, mulching), thermic, chemical, biological measures, and by growing cover crops. In practice, weed control in apple orchards is dominantly done by herbicides, based on the following active substances: napropamide, glyphosate, 2.4D, flazasulfuron, flurochloridone, cycloxydim, fluazifop-p-butyl, clethodim, diquat, fluroxypyr-meptyl, and pyraflufen-ethyl. Given that nowadays the production of healthy and safe food is an imperative, also demanded by the international market, it is expected that bioproducts will be prioritized over classical synthetic herbicides. Moreover, non-chemical measures are also becoming more important as part of integral weed control measures of weeds in apple orchards.
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Sharofiddinova, M. J. "The Effects Of Weed Control Methods On Weeds In Cotton And Autumn Wheat Fields". American Journal of Agriculture and Biomedical Engineering 02, n.º 12 (27 de dezembro de 2020): 9–13. http://dx.doi.org/10.37547/tajabe/volume02issue12-03.
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This article provides the results of harmonized weed control measures, which annual and biennial weeds in cotton and autumn wheat fields have been reduced by 80.2-82.7% in cotton fields and by 93.5% in autumn wheat fields.
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Harker, K. Neil, e John T. O'Donovan. "Recent Weed Control, Weed Management, and Integrated Weed Management". Weed Technology 27, n.º 1 (março de 2013): 1–11. http://dx.doi.org/10.1614/wt-d-12-00109.1.
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Integrated weed management (IWM) can be defined as a holistic approach to weed management that integrates different methods of weed control to provide the crop with an advantage over weeds. It is practiced globally at varying levels of adoption from farm to farm. IWM has the potential to restrict weed populations to manageable levels, reduce the environmental impact of individual weed management practices, increase cropping system sustainability, and reduce selection pressure for weed resistance to herbicides. There is some debate as to whether simple herbicidal weed control programs have now shifted to more diverse IWM cropping systems. Given the rapid evolution and spread of herbicide-resistant weeds and their negative consequences, one might predict that IWM research would currently be a prominent activity among weed scientists. Here we examine the level of research activity dedicated to weed control techniques and the assemblage of IWM techniques in cropping systems as evidenced by scientific paper publications from 1995 to June 1, 2012. Authors from the United States have published more weed and IWM-related articles than authors from any other country. When IWM articles were weighted as a proportion of country population, arable land, or crop production, authors from Switzerland, the Netherlands, New Zealand, Australia, and Canada were most prominent. Considerable evidence exists that research on nonherbicidal weed management strategies as well as strategies that integrate other weed management systems with herbicide use has increased. However, articles published on chemical control still eclipse any other weed management method. The latter emphasis continues to retard the development of weed science as a balanced discipline.
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Kashe, Keotshephile, Dikungwa Ketumile, Paul Kristiansen, Cornelius Mahilo e Thebeetsile Moroke. "Evaluation of pre-emergence herbicides for weed control in maize". Welwitschia International Journal of Agricultural Sciences 2 (5 de dezembro de 2020): 5–18. http://dx.doi.org/10.32642/wijas.v2i.1437.
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Weed management is an ongoing constraint in southern Africa for conventional farming systems and in emerging conservation agriculture systems, which are more heavily reliant on herbicides for primary weed control. The challenge of rising labour costs and decreasing availability creates a greater need to develop effective and efficient weed management methods in key crops such as maize. Field experiments were conducted at Sebele Agricultural Research Station, Botswana in the 2011/12 and 2012/13 cropping seasons to evaluate pre-emergence application of atrazine at 1,000 and 2,000 g a.i. ha-1 and S-metolachlor at 1,440 and 2,880 g a.i. ha-1, and a tank mixture of atrazine at 1,000 and S-metolachlor at 1,440 g a.i. ha-1. Atrazine at either rate alone, effectively controlled annual broadleaf weeds: Acanthospermum hispidum, Datura ferox and Sesamum alatum, but failed to control annual grass weeds (Tragus berteronianus and Urochloa spp.). Conversely, sole application of S-metolachlor at either rate provided complete control of annual grass weeds, but poorly controlled annual broadleaf weeds except small-seeded Amaranthus hybridus and Amaranthus thunbergii. A tank mixture of atrazine and S-metolachlor provided broad-spectrum weed control and successfully controlled both annual broadleaf and grass weeds. Atrazine alone and in tank mixture with S-metolachlor significantly reduced annual broadleaf weed density and biomass and increased maize grain yield by more than 80% when compared with the weedy treatment. High weed density and biomass of annual broadleaf weeds in S-metolachlor treatments significantly reduced maize grain yield to levels similar to the weedy treatment. A pre-mixture of atrazine and S-metolachlor is recommended for broad-spectrum weed control. Using a combination of herbicides with different modes of action may reduce selection pressure for herbicide resistance.
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Fedoruk, L. K., E. N. Johnson e S. J. Shirtliffe. "The Critical Period of Weed Control for Lentil in Western Canada". Weed Science 59, n.º 4 (dezembro de 2011): 517–26. http://dx.doi.org/10.1614/ws-d-11-00051.1.
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Weed control in lentil is difficult because lentil is a poor competitor with weeds and few POST broadleaf herbicides are available. Imadazolinone-tolerant lentils have more herbicide options, but the optimum timing for herbicide application is not known. The critical period of weed control (CPWC) is the period in a crop's life cycle when weeds must be controlled in order to prevent yield loss. The objective of this research was to determine the CPWC for lentil. We made lentil remain weedy or weed-free from 0 to 11 aboveground nodes to investigate the durations of weed interference and weed-free period, respectively. It was found that lentil has a CPWC beginning at the five-node stage and continuing to the 10-node stage. There was an inverse relationship between weed biomass and lentil yield; that is, lentil yield was highest when weed biomass is minimal. We propose that the CPWC begins when weeds start to accumulate significant biomass and ends with crop canopy closure. Therefore, to maximize lentil yields, growers should consider using a POST residual herbicide that can control weeds during the CPWC.
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Al-Hinai, Yahya K., e Teryl R. Roper. "Temporal Effects of Chemical Weed Control on Tart Cherry Tree Growth, Yield, and Leaf Nitrogen Concentration". HortScience 36, n.º 1 (fevereiro de 2001): 80–82. http://dx.doi.org/10.21273/hortsci.36.1.80.
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This experiment was conducted to determine temporal weed management parameters for tart cherry (Prunus cerasus L.) orchards. Annual ryegrass (Lolium multiflorum L.) and lambsquarter (Chenopodium album L.) were planted in tree rows of a 4-year-old tart cherry orchard. Weeds either were not controlled or controlled with nonresidual herbicides during the following intervals: all-summer; May, June, July, or August; preharvest (April-July); or postharvest (late July to frost). Trees in all-summer, June, and preharvest weed-free plots had more shoot growth, more nodes, longer internodes, greater leaf area, and higher concentrations of leaf nitrogen than did those in the weedy control and postharvest, July, or August treatments. A larger increase in trunk circumference was observed in all-summer and preharvest weed-free plots than in postharvest and weedy plots. Early-summer weed control was important for tree vegetative growth. Tree yield (fruit weight and number) was greater on trees without weed competition postharvest than in those treated in May, June, July, or in weedy controls. Late-season (after late July) weed control is therefore important for fruit yield.
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Boyetchko, Susan M. "Principles of Biological Weed Control". HortScience 30, n.º 4 (julho de 1995): 750D—750. http://dx.doi.org/10.21273/hortsci.30.4.750d.
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Weeds continue to have a tremendous impact on crop yield losses in Canada and the United States, despite efforts to control them with chemicals. Biological control offers an additional means for reducing weed populations while reducing the reliance of the agri-food industry on chemical pesticides. Effective biological strategies that are compatible with good soil conservation practices would benefit farmers while maintaining environmental quality and a sustained production for the future. Inundative biological control of weeds with microbial agents involves the mass production and application of high concentrations of a plant pathogen to a target weed. Historically, biocontrol agents used on weeds have been foliar fungal pathogens. More recently, the soil has become a source for microorganisms, such as rhizobacteria, for development as biological control agents. Several naturally occurring rhizobacteria have weed suppressive properties, where growth and development of weeds such as downy brome, wild oats, leafy spurge, and green foxtail are significantly inhibited. Although the focus in weed biocontrol has been on the eradication of weeds, rhizobacteria may be used to improve seedling establishment of the crop by reducing the weed competition. This can be achieved through a reduction in weed growth, vigor, and reproductive capacity and improvement in the ability of the crop to compete with the weed. Current research in weed biocontrol with microorganisms and its application to weed management systems will be discussed.
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Wang, Hui, Wenpeng Shi, Qing Zha, Gang Ling, Wene Wang e Xiaotao Hu. "Weed Strategy Considering the Weed Control Effect and Weed Control Uniformity with Microsprinkler Irrigation". Agronomy 13, n.º 4 (31 de março de 2023): 1034. http://dx.doi.org/10.3390/agronomy13041034.
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Improper herbicide application without proper personnel protection (PPE) can be harmful. Herbicide application with microsprinkler irrigation reduces direct contact with herbicides with the benefits of being highly efficient, decreasing water and herbicide use, and using precise irrigation and concentration control during agricultural production. Therefore, to propose a reasonable strategy for applying microsprinkler irrigation, a laboratory test was conducted to study the water distribution characteristics, and different herbicide concentrations (1.5 g/L, 2.0 g/L, and 3.0 g/L) were used in a field irrigation experiment with polyethylene microsprinkler hoses. Wheat was selected as the test crop, and the effects of the different herbicide concentrations were compared and analyzed based on the weed control effect and weed control uniformity. The results showed that in comparison to other herbicide concentrations, a higher herbicide application concentration (3.0 g/L) did not have a better application effect. Application concentration and duration influenced each other and synergistically affected the application effect. The weed control effects of the herbicide concentrations at 1.5 g/L and 2.0 g/L were similar and had better application effects than those of the other concentrations. When using this approach, the specific herbicide concentration should be determined according to the crop and soil environmental conditions, and the application concentration and duration should be adjusted reasonably.
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Yoneyama, Koichi. "Weed-control measures". Nature Chemical Biology 12, n.º 9 (18 de agosto de 2016): 658–59. http://dx.doi.org/10.1038/nchembio.2155.
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Van Zon, J. C. J. "Aquatic weed control". Aquatic Botany 36, n.º 1 (dezembro de 1989): 97–99. http://dx.doi.org/10.1016/0304-3770(89)90095-8.
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Gutiérrez, Eric, Felipe Arreguín, Rubén Huerto e Pilar Saldaña. "Aquatic weed control". International Journal of Water Resources Development 10, n.º 3 (janeiro de 1994): 291–312. http://dx.doi.org/10.1080/07900629408722631.
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Sugden, A. M. "ECOLOGY: Weed Control". Science 293, n.º 5534 (24 de agosto de 2001): 1405b—1405. http://dx.doi.org/10.1126/science.293.5534.1405b.
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James, T. K., A. Rahman e J. Mellsop. "Weed competition in maize crop under different timings for postemergence weed control". New Zealand Plant Protection 53 (1 de agosto de 2000): 269–72. http://dx.doi.org/10.30843/nzpp.2000.53.3706.
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The effect of early weed competition was determined for a maize (Zea mays) crop grown in Waikato Maize was established in three different environments viz weedy (no herbicide) grass weeds (preemergence atrazine) and broadleaf weeds (preemergence metolachlor) Surviving weeds were controlled with postemergence nicosulfuron (60 g/ha) after different periods of competition and the plots kept weed free for the remainder of the trial Weeds left completely uncontrolled for 4 weeks after emergence significantly reduced crop yields When a preemergence herbicide was used surviving weeds began to reduce maize yields after about 6 weeks with grasses having greater effect than broadleaf weeds The actual period before the weeds started affecting crop growth and yield appeared to be related to the time taken by the weeds to achieve complete ground cover
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Shahabuddin, M., MM Hossain, M. Salim e M. Begum. "Efficacy of pretilachlor and oxadiazon on weed control and yield performance of transplant Aman rice". Progressive Agriculture 27, n.º 2 (17 de agosto de 2016): 119–27. http://dx.doi.org/10.3329/pa.v27i2.29320.
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Two experimentswere carried out at the Agronomy Field laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2014 to study the effectiveness of pretilachlor and oxadiazon on weed control and yield performance oftransplant aman rice. In experiment I BRRI dhan31and in experiment II BRRI dhan46 was transplanted with eight weeding practices viz., weedy check; one hand weeding; two hand weeding; weed free;Pretilachlor only;Oxadiazon only;Pretilachlor + one hand weeding; and Oxadiazon+ one hand weeding. The design was split-plot with three replications. Eleven weed species were found to be infested in the experimental plots. Although weeds were completely controlled in weed free treatment, it is not practicable.Pretilachlor oroxadiazon with one hand weeding performed the best in terms of weed density and weed biomass over single application of each and even manual weeding. Weeds were completely resistant to weedy check, poorly susceptible to one hand weeding, moderately susceptible to two hand weeding and single application of both herbicide and highly susceptible to both herbicides with one hand weeding while weeds were completely susceptible to weed free treatment. Herbicides produced slight phyto-toxicity which was recovered by two weeks of application. The highest grain yield was recorded from weed free treatment and was statistically identical to pretilachlor oroxadiazon with one hand weeding. Single application of pretilachlor oroxadiazon ranked the third in terms of yield and statistically similar to two hand weeding followed by one hand weeding. Weedy check performed the worst.Progressive Agriculture 27 (2): 119-127, 2016
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Orzolek, M. D., J. H. Murphy e L. Otjen. "Nonchemical Weed Control in Cabbage". HortScience 31, n.º 4 (agosto de 1996): 577c—577. http://dx.doi.org/10.21273/hortsci.31.4.577c.
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Early weed infestation in vegetable crops reduces both early and total marketable yield and quality. Even if escape weeds (12 inches tall or larger) are later killed by a postemergence herbicide application, their skeletons can cause yield loss due to competition for light, temperature modification within the plant canopy, and interference with fungicide and insecticide applications. In addition, weeds can also serve as a reservoir for insect and disease organisms, especially viruses. Experiments in nonchemical weed control in cabbage were conducted at the Horticulture Research Farm, Russell E. Larson Research Center, Rock Springs, Pa., from 1993 to 1995. In addition to weedy and hoed check plots, flaming weeds at 2- to 4-leaf stage of growth with propane gas burners and planting annual ryegrass (Lolium multiflorum) between the rows of cabbage, living mulch, were evaluated during 3 years. The cabbage cultivar Rio Verde was transplanted generally between 15 June and July during each year. Both flaming and living mulch treatments produced yield and head quality similar to the hoed check. Management and timing of ryegrass planting in relation to cabbage establishment is very critical for success with living mulch. Flaming requires straight rows of cabbage or other crop, tractor with driver that can maintain a straight line, and burners that are aligned to burn weeds and not the crop. Results will be discussed.
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Virili, Alessandra, e Anna-Camilla Moonen. "Minimal Necessary Weed Control Does Not Increase Weed-Mediated Biological Pest Control in Romaine Lettuce (Lactuca sativa L., var. Romana)". Horticulturae 8, n.º 9 (30 de agosto de 2022): 787. http://dx.doi.org/10.3390/horticulturae8090787.
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Lettuce is one of the most consumed leafy greens. Depending on the variety, it is ready for harvesting 40–80 days after sowing, and therefore several growth cycles can be concluded within a growing season. Due to its high market standards, lettuce may require intensive management. This study implemented a critical period of weed interference (CPWI) trial to understand at which moment of the cropping cycle weeds can be tolerated without impacting crop yield to decrease the time needed for weeding and assess the potential support weeds can give to biological pest control in lettuce. Treatments represented two gradients of weed intensity: (1) increasingly weed-free, and (2) increasingly weedy. Dose–response curves were produced to find the CPWI based on lettuce relative yield. RLQ analysis was used to explore the relationships between weeding regime and weed functional traits for biological pest control. Yield was above the 5% acceptable yield loss threshold in all plots kept weed-free for 20 days or more, indicating a necessary weed-free period of 20 days from transplanting. However, the support of beneficial insects was not guaranteed at the end of the necessary weed-free period. We suggest that it is possible to limit intense weed management to the beginning of the growing season, reducing the cost of plastic mulches and increasing on-farm biodiversity, but field margins could be better suited to deliver conservation biological control in short-term crops where this service is of primary interest.
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Burnside, Orvin C., Melvin J. Wiens, Bobby J. Holder, Sanford Weisbere, Eric A. Ristau, Michelle M. Johnson e James H. Cameron. "Critical periods for weed control in dry beans (Phaseolus vulgaris)". Weed Science 46, n.º 3 (junho de 1998): 301–6. http://dx.doi.org/10.1017/s0043174500089451.
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Weed removal experiments in dry edible beans were conducted during 1992 and 1993 at Crookston and Staples, MN. Ten manual weed removal treatments were studied to determine when a natural infestation of weeds first reduced dry bean yield, and when weed removal could be discontinued without further loss of seed yield. Major weeds in order of average biomass production on weedy check plots at dry bean harvest over locations and years were wild mustard, foxtail spp., redroot pigweed, common ragweed, wild buckwheat, hairy nightshade, and common lambsquarters. Hairy nightshade also emerged late in the growing season and could negatively affect harvest efficiency and stain navy beans. Weed removal treatments had little effect on dry bean stands or 100-seed weights of harvested dry bean seed. The critical period for weed control in dry beans was 3 to 5 or 6 weeks after planting (WAP). Thus, weed control practices should begin no later than 3 WAP and continue until at least 5 or 6 WAP for maximum dry bean yields.
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Jursík, M., J. Holec, J. Soukup e V. Venclová. "Competitive relationships between sugar beet and weeds in dependence on time of weed control". Plant, Soil and Environment 54, No. 3 (19 de março de 2008): 108–16. http://dx.doi.org/10.17221/2687-pse.
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Small plot trials were carried out in years 2001–2003 with sugar beet. In the treatment without weed control, dry weight of sugar beet top and LAI of sugar beet were very low (approx. 50 g/m<sup>2</sup> and 0.5 m<sup>2</sup>/m<sup>2</sup>, respectively). Yield loss of sugar beet was 80–93%. Dominant weeds were <I>Chenopodium album, Fumaria officinalis</I> and <I>Galium aparine</I>. In the treatments where weeds were removed (by hand) until 4 leaf stage of sugar beet, dry weight of sugar beet top and LAI of sugar beet at first increased normally, but were markedly decreased from the half of the vegetation period. Yield loss of sugar beet was 54–28%. Dominant weed in this treatment was <I>Amaranthus retroflexus</I>. The development of sugar beet top dry weight and LAI of sugar beet was practically identical in the treatments where weeds were removed until 8–10 leaf stage of the crop and in those where weeds were removed during the whole vegetation period (500–900 g/m<sup>2</sup>, or 4–7 m<sup>2</sup>/m<sup>2</sup>, respectively). No yield loss of sugar beet was recorded. Dry weight of weeds did not exceed 30 g/m<sup>2</sup> and LAI 0.1 m<sup>2</sup>/m<sup>2</sup>. <I>A. retroflexus</I> and <I>Mercurialis annua</I> were the most frequent weeds in this treatment.
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SEN, SUMAN, Y. K. ZIAR, T. K. DAS e RISHI RAJ. "Effect of herbicides on distribution and interference of weeds, growth and yield of wheat (Triticum aestivum) in Kandahar, Afghanistan". Indian Journal of Agricultural Sciences 92, n.º 5 (14 de junho de 2022): 563–66. http://dx.doi.org/10.56093/ijas.v92i5.124623.
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Weeds are the major constraint to achieving higher wheat yield in Afghanistan. To evaluate weed interference and its impact on wheat, a field experiment was undertaken during winter season in 2014–15 at Afghanistan National Agricultural Science and Technology University (ANASTU), Kandahar. Seven weed control treatments comprising isoproturon 0.75 and 1.0 kg/ha at 35 days after sowing (DAS), sulfosulfuron 20 and 25 g/ha at 35 DAS, isoproturon + 2,4-D 0.75 + 0.5 kg/ha at 35 DAS (tank-mix), weed-free check and weedy check were laid out in a randomized complete block design with three replications. Results showed that grassy weeds constituted 62.7% of the total weeds and were mostly dominant. All herbicides/weed control treatments influenced weed interference, wheat cropgrowth and yield significantly. Sulfosulfuron 25 g/ha at 35 DAS resulted in significant reduction in weed density by 95.2% (i.e. weed control efficiency) and dry weight by 95.1% (i.e. weed control index), respectively. This treatment led to significant improvements in wheat growth (Leaf area index, dry matter accumulation) and grain (4.6 t/ha) and biological yields (10.6 t/ha), and was superior to other herbicide treatments. It increased wheat grain and biological yields by 24.3% and 17.8%, respectively, compared to weedy check. Therefore, the application of sulfosulfuron 25 g/ha at 35 DAS may be recommended for better weed control and higher wheat yield in Kandahar, Afghanistan, and in similar agro-ecologies of the tropics and sub-tropics.
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Sathe, R. K., e B. S. Raskar. "Organic Methods of Weed Control in Brinjal (Solanum melongena L.) Cultivation- Alternative to Conventional Chemical Control". International Journal of Plant & Soil Science 35, n.º 17 (11 de julho de 2023): 587–99. http://dx.doi.org/10.9734/ijpss/2023/v35i173249.
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The current study, named "Development of organic farming package for brinjal (Solanum melongena L.)," was carried out at the Mahatma Phule Krishi Vidyapeeth's Research Farm in Rahuri, District of Ahmednagar, Maharashtra (India), during the kharif seasons of 2017 and 2018. Due to weed free treatment followed by mechanical (hoeing) intercultivation and pulling of weeds at 20 days intervals from 20 to 80 days after transplanting of brinjal 2017 and 2018, monocot and dicot weed intensity, category wise weed density (grasses, broad-leaved weeds, sedges), and total dry matter of weeds were significantly at lower magnitudes and weed control efficiency was at higher magnitudes. Weed index was also significantly lower. The mechanical (hoeing) intercultivation method followed by weed-free culture resulted in significantly higher parameters for growth for brinjal.
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Webber, Charles L., e James W. Shrefler. "(220) Pelargonic Acid Weed Control Parameters". HortScience 41, n.º 4 (julho de 2006): 1034D—1034. http://dx.doi.org/10.21273/hortsci.41.4.1034d.
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Producers and researchers are interested in pelargonic acid (nonanoic acid) as a broad-spectrum postemergence or burn-down herbicide. Pelargonic acid is a fatty acid naturally occurring in many plants and animals, and present in many foods we consume. The objective of this research was to determine the effect of pelargonic acid concentration, adjuvants, and application timing on weed control efficacy as a burn-down herbicide. Field research was conducted at Lane, Okla. (southeast Oklahoma), during the 2005 growing season. One month prior to spraying the weed control treatments, the land was cultivated to kill the existing weeds and provide a uniform seed bed for new weed growth. The factorial weed control treatments included three application concentrations of Scythe (57.0% pelargonic acid) applied at 3%, 6.5%, and 10%; three adjuvants (none, orange oil, and non-ionic surfactant); and two application dates. All herbicide treatments were applied with an application volume of 935 L/ha to seedling weeds. The experiment had a high weed density with multiple species of grass and broadleaf weeds. Weed control across species increased as the herbicide concentrations increased from 0% to 10%. At all concentrations applied, pelargonic acid produced greater weed control for a longer time period for the broadleaf weeds than the grass weeds. Visual damage to the weeds was often apparent within a few hours after application. There was a significant increase in weed control when applied to the younger weeds. In this research, pelargonic acid was effective in controlling both broadleaf and grass weeds as a burn-down herbicide, although crabgrass was tougher to control.
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Colquhoun, Jed B., Christopher M. Konieczka e Richard A. Rittmeyer. "Ability of Potato Cultivars to Tolerate and Suppress Weeds". Weed Technology 23, n.º 2 (junho de 2009): 287–91. http://dx.doi.org/10.1614/wt-08-062.1.
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Potato producers rely heavily on herbicides for the majority of weed control. However, recent occurrences of herbicide-resistant weed populations and the lack of new herbicide registrations have stimulated interest in alternative strategies. The choice of potato cultivars that can suppress or tolerate weed competition could be a component of an integrated weed management system to reduce reliance on herbicides. The competitive ability of 10 potato cultivars—‘Atlantic’, ‘Bannock Russet’, ‘Dark Red Norland’, ‘Goldrush’, ‘Rodeo’, ‘Russet Burbank’, ‘Russet Norkotah’, ‘Snowden’, ‘Superior’, and ‘Villetta Rose’—was evaluated in 2006 and 2007 in Hancock, WI. Weed competition treatments included (1) weedy throughout the season, (2) weed-free from emergence to 4 wk after emergence (WAE) by hand-weeding, and (3) weed-free by hand-weeding for the entire season. Potato cultivars did not differ in ability to reduce weed biomass. Early-season time of potato emergence and canopy closure, as well as weed competition treatments, were strongly related to potato tuber yield. In general, Bannock Russet yield relative to weed-free controls of the same cultivar was less than that of most other cultivars. Overall, Atlantic, Russet Burbank, Snowden, and Superior yields (relative to weed-free control yields) usually were greater than the yields of other cultivars under weedy conditions. Although the ability to suppress weeds was similar among cultivars, differences in yield among cultivars grown in the presence of weeds suggest differential tolerances of weed competition.
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Nursa’adah, W. Akasah, D. P. Totti, A. Putra e M. O. Mulya. "Comparison of several weed control and tillage techniques in suppressing weeds and increasing maize production for integrated weed control". IOP Conference Series: Earth and Environmental Science 1302, n.º 1 (1 de fevereiro de 2024): 012035. http://dx.doi.org/10.1088/1755-1315/1302/1/012035.
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Abstract The use of herbicides has received attention due to its effects on human health, sustainability, and biodiversity due to toxic chemicals in herbicides. Repeated use of herbicide active ingredients over a long period of time can result in the emergence of resistant weeds. One strategy to reduce the herbicide use without decreasing productivity is integrated weed control. This study aims to compare the effectiveness of several weed control techniques in integrated weed control and their role in suppressing weeds and increasing maize crop production. This study used a Randomized Group Design with 2 factorials. The first factor was weed control technique (W) with levels: no control (W0), cover crop (W1), pre-emergent herbicide (W2), post-emergent herbicide (W3), and weed-free (with weeding) (W4). And the second factor was tillage technique (T), namely: no tillage (T0) and conventional tillage (T1). The results showed that post-emergent herbicides were more effective in controlling weeds and the highest crop production with weed control techniques with pre-emergent herbicides. The tillage technique had no significant effect on weeds and maize crop production.
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Moyer, J. R., S. N. Acharya e Z. Mir. "Weed management at the time of perennial cereal rye establishment". Canadian Journal of Plant Science 82, n.º 2 (1 de abril de 2002): 457–62. http://dx.doi.org/10.4141/p01-087.
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Perennial cereal rye (PC rye) is a new crop that is being developed at the Lethbridge Research Centre for the production of silage for cattle. Its ability to compete with weeds during establishment and tolerance to herbicides for weed control was unknown. Therefore, experiments were established with PC rye, and several herbicide treatments were applied to test crop tolerance and weed control. PC rye was not injured by bromoxynil/MCPA, 2,4-D, thifensulfuron/tribenuron, fenoxaprop, clodinafop-propargyl, and tralkoxydim. Combinations of herbicides for broadleaf weed control and annual grass control usually reduced weed dry matter (DM) to < 5 g m-2 in the establishment year. Weeds made up 20 to 36% of the total DM when herbicides were not applied. However, this level of weed content did not affect the digestibility of the forage samples or the total DM produced as weed DM compensated for reduced PC rye yield in weedy plots. Also, the presence of weeds during establishment of PC rye did not affect weed content or PC rye yields the year after establishment. Key words: Acid detergent fibre, digestibility, neutral detergent fibre, perennial cereal rye, weed control, yield
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Edyson, Edyson, Fitrah Murgianto e Adhy Ardiyanto. "Epiphytic Weeds Control by Root Infusion Method in Oil Palm". PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) 10, n.º 1 (28 de fevereiro de 2022): 55–61. http://dx.doi.org/10.18196/pt.v10i1.10802.
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Epiphytic weeds living on oil palm trunks will complicate harvesting activities. In addition, the presence of this weed can increase the risk of accidents being hit by fruit during harvesting. The objective of this research was to obtain herbicide and its efficient concentrations to control epiphytic weeds using root infusion method. The research was arranged in a single factor completely randomized design (CRD) with five treatments and five replications. Active ingredients of herbicide that used were methyl metsulfuron at a concentration of 20%, 30%, and 40%, glyphosate 30%, and triclopyr + diesel fuel at a ratio of 1:19. All treatments except triclopyr were diluted in 100 ml water for each epiphytic weed. Weed mortality rate (%) was observed every week for one month. The results showed that a solution of 30% methyl metsulfuron herbicide in 100 ml of water and 30% glyphosate in 100 ml of water was the most optimal treatment in controlling epiphytic weeds. Cutting the entire suction root of epiphytic weeds can increase the chance of weed mortality.
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Ivanov, S. "Weeds and weed control in forage pea: A Review". Agricultural Science and Technology 11, n.º 2 (junho de 2019): 107–12. http://dx.doi.org/10.15547/ast.2019.02.017.
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Abstract. A major limitation factor for the low productivity in peas is weeding. A particularly critical moment in the race between the crop and weeds is the early period of growth and development. Given the influence of the varying climatic and soil conditions on the diversity and density of weed species, a differentiated approach is needed to remove them by using chemical and agrotechnical means. Studies on the varietal susceptibility to herbicides in forage pea in Bulgaria are very limited due to the fact that varietal diversity was not available in the recent past. The objective of the paper is to present a short analysis of the studies relating to weeding in peas and the control of the more important weed groups in it as well as to establish an individual approach in applying agrotechnical and chemical methods for weed control in growing different pea varieties of winter and spring forms. The use of pea varieties different in biological type as well as the possibilities to use varieties from the European variety list in modern agriculture determines the need to test the reaction of each individual variety not only to the herbicides recommended for this crop, but also to new herbicidal preparations and doses. Determining the composition of weed associations, applying suitable herbicides and herbicide mixtures in weed control of pea, combined with proper agrotechnics, is a prerequisite for optimizing the biological productive potential of the crop.
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I.B. PANDEY e D.K. DWIVEDI. "Effect of planting pattern and weed-control methods on weed growth and performance of wheat (Triticum aestivum)". Indian Journal of Agronomy 52, n.º 3 (10 de outubro de 2001): 235–38. http://dx.doi.org/10.59797/ija.v52i3.4931.
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A field experiment was conducted during 2000-01 and 2001 -02 at Pusa, Bihar to study weed growth, nutrient removal, weed-control efficiency and yield, and nutrient uptake by wheat (Triticurn aestivurn L. emend. Fiori & Paol.) as influenced by planting pattern [criss-cross (20 cm x 20 cm), normal line sowing (20 cm) and broadcast] as well as weed-control treatment [weedy check, hand-weeding (30 days after sowing), isoproturon @ 0.75 kg/ ha (pre-emergence), sulfosulfuron @ 33.3 glha (post-emergence) and 2,4-D Na salt @ 0.80 kglha (post-emer- gence)]. Criss-cross sowing significantly reduced the weed biomass and hence lowered the nutrient depletion by weeds, ultimately resulting in higher nutrient uptake and yield of wheat crop. Normal line sowing and broadcast- ing methods recorded 7.29 and 19.93% less grain yield than criss-cross sowing. Amongst the weed-control treat- ments, post-emergence application of sulfosulfuron was found on a par with hand weeding treatment for control- ling weeds and producing grain yield of wheat. The different weed-control measures led to 119.5-139.0, 123.2- 141.3 and 120.4-138.5% increase in N, P and K uptake by wheat respectively, and 59.9-74.6, 60.2-75.0 and 60.0-75.5% reduction in the depletion by weeds over the weedy check.
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Samanta Tanu, Shaon, Purnendu Biswas, Sultan Ahmed e Swadesh Chandar Samanta. "EFFICACY OF SUNFLOWER RESIDUES AND HERBICIDES IN CONTROLLING WEEDS IN TRANSPLANTED RICE". International Journal of Applied Biology 4, n.º 1 (29 de junho de 2020): 100–114. http://dx.doi.org/10.20956/ijab.v4i1.10360.
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The experiment was conducted at Agronomy Field Laboratory of Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh from July 2018 to November 2018 to find out the effect of sunflower residues and herbicides on weed control and yield of T. Aman rice. Weed control methods tested were T1= weedy check,T2 = Weed free check, T3 = Pendimethalin,T4 = Pretilachlor,T5= Butachlor,T6 = Pyrazosulfuron ethyl,T7 = Bensulfuron methyl + Acetachlor,T8 = Bispyriback sodium,T9 =2,4-D amine,T10 =MCPA,T11 = Sunflower residues ,T12 = Sunflower residues + 100%Pyrazosulfuron ethyl,T13 = Sunflower residues + 75%Pyrazosulfuron ethyl,T14 = Sunflower residues + 50%Pyrazosulfuron ethyl. The weed spectrum of the experimental field consisted of all the three groups of weeds viz., grasses (15.78%), sedges (59.02%) and broad-leaved weeds (25.2%). The dominants weeds were Cynodon dactylonand Echinochloa crusgalli among grasses; Cyperus difformis, Fimbristylis miliacea and Scirpus supinus among sedges and Jussiaea decurrens among broad-leaved weeds. Hand weeding recorded the highest weed control efficiency (99.05%) and weedy check recorded the lowest. Among different herbicides applied alone, butachlor had the highest weed control efficiency (87.59%).Hand weeding produced the highest grain yield (5.14 t ha-1) which was statistically similar to butachlor, pendimethalin, pretilachlor, bensulfuron methyl + acetachlor and sunflower residues + 100% pyrazosulfuronethyl. Application of sunflower residues along with the reduced rate (75 or 50%) of pyrazosulfuron ethyl had effective weed control and satisfactory yield comparable to butachlor. The farmers can use this technology as an eco-friendly approach in transplanted Aman rice field.
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Page, Eric R., Diego Cerrudo, Philip Westra, Mark Loux, Kenneth Smith, Chuck Foresman, Harold Wright e Clarence J. Swanton. "Why Early Season Weed Control Is Important in Maize". Weed Science 60, n.º 3 (setembro de 2012): 423–30. http://dx.doi.org/10.1614/ws-d-11-00183.1.
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Control of early-emerging weeds is essential to protect the yield potential of maize. An understanding of the physiological changes that occur as a result of weed interference is required to address variability in yield loss across sites and years. Field trials were conducted at the University of Guelph (UG), the Ohio State University (OSU), and Colorado State University (CSU) during 2009 and 2010. There were six treatments (season-long weedy and weed-free, and weed control at the 1st-, 3rd-, 5th-, and 10th-leaf-tip stages of maize development) and 20 individual plants per plot were harvested at maturity. We hypothesized that, as weed control was delayed, weed interference in the early stages of maize development would increase plant-to-plant variability in plant dry-matter accumulation, which would result in a reduction of grain yield at maturity. The onset of the critical period for weed control (CPWC) occurred on average between the third and fifth leaf tip stages of development (i.e., V1 to V3, respectively). Rate of yield loss following the onset of the CPWC ranged from 0.05 MG ha−1d−1at UG 2009 to 0.22 MG ha−1d−1at CSU 2010 (i.e., 0.5 and 1.6% d−1, respectively). On average, reductions in kernel number per plant accounted for approximately 65% of the decline in grain yield as weed control was delayed. Biomass partitioning to the grain was stable through early weed removal treatments, increased and peaked at the 10th-leaf-tip time of control, and decreased in the season-long weedy treatment. Plant-to-plant variability in dry matter at maturity and incidence of bareness increased as weed control was delayed. As weed control was delayed, the contribution of plant-to-plant variability at maturity to the overall yield loss was small, relative to the decline of mean plant dry matter.
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GUZZO, CAIO D., LEONARDO B. DE CARVALHO, PAULO R. F. GIANCOTTI, PEDRO L. C. A. ALVES, ELAINE C. P. GONÇALVES e JOSÉ V. F. MARTINS. "Impact of the timing and duration of weed control on the establishment of a rubber tree plantation". Anais da Academia Brasileira de Ciências 86, n.º 1 (março de 2014): 495–504. http://dx.doi.org/10.1590/0001-37652014119113.
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Rubber tree production is reduced by weeds that compete for environmental resources; therefore, the timing and duration of weed control influences weed interference. The objectives of this study were to evaluate the growth of rubber tree (Hevea brasiliensis) plants, to determine the critical period for weed control, and to evaluate the growth recovery of rubber trees that coexisted with weeds for different periods of time after planting. Two groups of treatments were established under field conditions in the first year of the investigation: one group contained crescent periods of weed infestation, while the other contained crescent periods of weed control, also including a weed-free check and a total weedy check. In the second year of the investigation, the weeds were totally controlled. Urochloa decumbens was the dominant weed (over 90% groundcover). Crop growth was greatly reduced due to the weed interference. Plant height decreased more rapidly than did any other characteristic. Plant height, leaf dry mass, and leaf area decreased by 99%, 97% and 96%, respectively, and were the most reduced characteristics. Plant height also recovered more rapidly than did any characteristic when the period of weed control was lengthened. However, stem dry mass increased by 750%, making it the most recovered characteristic. The critical period for weed control was between 4 and 9½ months after planting in the first year; however, the rubber trees showed an expressive growth recovery when the weeds were controlled throughout the second year.
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Ateh, Comfort M., e Jerry D. Doll. "Spring-Planted Winter Rye (Secale cereale) as a Living Mulch to Control Weeds in Soybean (Glycine max)". Weed Technology 10, n.º 2 (junho de 1996): 347–53. http://dx.doi.org/10.1017/s0890037x00040070.
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The effects of rye planting time, rye seeding rate, and rye/weed management systems on weed control and soybean yield were determined in field experiments near Arlington, WI from 1992 to 1994. Insufficient precipitation in 1992 resulted in limited soil moisture, less ground cover, less weed control, and lower soybean yields than in 1993 and 1994. The higher rye seeding rate provided more ground cover and better weed control than the lower rate in all years; however, it reduced soybean vigor. The optimum rye seeding rate was 112 kg/ha. The rye-only system reduced weed shoot biomass by 90, 82, and 60%, in 1992, 1993, and 1994, respectively, relative to the no-rye weedy check treatment. Killing rye 45 d after planting soybean gave optimum weed control. In 1993, rye alone suppressed the weeds without decreasing crop yield, but in 1994 crop yield was decreased due to inadequate weed control by rye. The results indicate that the rye living mulch technique can adequately control weeds without causing soybean yield reduction if weed pressure is low, ground cover and soil moisture are adequate and rye interference is minimal.
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Ahmadi, Abdol Reza, Saeed Shahbazi e Marjan Diyanat. "Efficacy of Five Herbicides for Weed Control in Rain-Fed Lentil (Lens culinaris Medik.)". Weed Technology 30, n.º 2 (junho de 2016): 448–55. http://dx.doi.org/10.1614/wt-d-15-00125.1.
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Lentil is vulnerable to weed competition because of its short stature, slow establishment, and limited vegetative growth. Although the vast majority of lentil production is under rain-fed conditions, there is a little published information on weed control with herbicides in rain-fed lentils. Field experiments were conducted to determine the efficacy of nine herbicide treatments including fomesafen, imazethapyr, linuron, pendimethalin, and pyridate alone or in combination compared with one or two hand weeding(s) on weed control and yield response in rain-fed lentil in Khorramabad, Iran in 2012 and 2013. Weed species included catchweed bedstraw, cowcockle, haresear mustard, hoary cress, wild mustard, and wild safflower. Total weed dry biomass in weedy check plots averaged 156 and 170 g m−2 in 2012 and 2013, respectively, and weed density and biomass were reduced in all treatments compared to the weedy check in both years. Plots that were hand weeded twice reduced weed biomass the greatest, whereas fomesafen, linuron, or one hand weeding did not control weeds satisfactorily. Noncontrolled weeds reduced lentil yield by 67% both years compared to the weed-free control. Lentil yield in 2013 (1,370 kg ha−1) was higher than in 2012 (1,150 kg ha−1). All herbicides tested injured lentil slightly, with pyridate (1,200 g ai ha−1) and pendimethalin (660 g ai ha−1 plus imazethapyr at 250 to 500 g ai ha−1) causing the least injury. Across all treatments, imazethapyr plus pendimethalin PRE, pyridate POST, and two hand-weeding treatments had the best performance for weed control and lentil yield.
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Webber III, Charles L., Paul M. White Jr, James W. Shrefler e Douglas J. Spaunhorst. "Impact of Acetic Acid Concentration, Application Volume, and Adjuvants on Weed Control Efficacy". Journal of Agricultural Science 10, n.º 8 (10 de julho de 2018): 1. http://dx.doi.org/10.5539/jas.v10n8p1.
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Acetic acid (CH3COOH) is produced naturally through anaerobic fermentation (vinegar) or synthesized through various industrial chemical methods. The primary components of vinegar are water and acetic acid. Acetic acid can destroy cell membranes, which then can result in plant tissue desiccation and plant death. Therefore, vinegar has the potential as a natural contact herbicide for the control of weeds in organically produced crops. Additional information is needed to determine the influence of acetic acid concentration, application volume, and adjuvants on weed control. Typically, household vinegar contains 5% acetic acid and greater acetic acid concentrations are available commercially. Field research was conducted in southeast Oklahoma (Lane, OK) to determine the effect of acetic acid concentrations, application volumes, and adjuvants on weed control efficacy. The factorial experimental design included three acetic acid concentrations (0, 5 and 20%), two sprayer application volumes (187 and 935 L/ha), three adjuvants (none, orange oil, and canola oil), and one weedy-check. The experiment was repeated twice. Visual weed cover and control ratings were collected 4 days after treatment. The experiment had very high weed densities with multiple grass and broadleaf weed species. The weedy check average weed cover percentages were 98% total weeds, 53% grass, 44% broadleaf weeds, 52% large crabgrass (Digitaria sanguinalis (L.), 25% carpetweed (Mollugo verticillata L.), and 14% cutleaf evening primrose (Oenothera laciniata Hill). Total weed control ranged from 0% control (no acetic acid) to 74% control (20% acetic acid, 935 L/ha, & canola oil). Acetic acid was more effective in controlling broadleaf weeds than in controlling grasses. Optimum total grass and crabgrass weed control occurred with 20% acetic acid applied at 935 L/ha, resulting in weed control that ranged from 44% to 63%. Broadleaf weed control was 84% or greater for plots receiving either 10% acetic acid applied at 935 L/ha or 20% acetic acid applied at 187 or 935 L/ha. In addition, 5% acetic acid applied at 187 L/ha provided good cutleaf evening primrose control (77% to 90%). When averaged across application volumes (187 and 935 L/ha) and adjuvants (none, orange oil, and canola oil), weed control increased for all species as acetic acid concentrations increased from 5% to 20%. When averaged across acetic acid concentrations and adjuvants, weed control increased as application volumes increased from 187 to 935 L/ha. Individual comparisons among adjuvants within acetic acid concentrations and application volumes showed little or no advantage to adding either orange oil or canola oil to vinegar spray solutions.
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Buhler, Douglas D. "Weed population responses to weed control practices. II. Residual effects on weed populations, control, andGlycine maxyield". Weed Science 47, n.º 4 (agosto de 1999): 423–26. http://dx.doi.org/10.1017/s004317450009202x.
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Weed populations, weed control with imazethapyr, andGlycine maxyields were affected by a 4-yr history of different weed control practices. A range of chemical and mechanical practices were applied in separate field experiments initiated under high and low weed densities. In the high-density experiment, plots kept weed free for 4 yr averaged 24Setaria faberiplants m−2compared with 200 to 600 plants m−2with the various weed control treatments. In plots with a history of mechanical control, weeds not controlled by imazethapyr reducedG. maxyield by 340 kg ha−1compared with plots that were kept weed free during the same period. In the low-density experiment, weed control history had less effect on weed densities. For example,S. faberidensities ranged from 19 plants m−2for the weed-free plots to 195 plants m−2with mechanical control. Weed control history had little effect on weed control with imazethapyr orG. maxyields in imazethapyr-treated plots. While weed-free conditions for 4 yr greatly reduced weed densities, imazethapyr application still increasedG. maxyields 22% in the low-density experiment and 51% in the high-density experiment. Differences in densities of individual annual broadleaf species also developed in response to weed control history in both experiments.
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Sakai, K., M. Takai, K. Matsumoto e M. Ohara. "WEED SEED PRODUCTION FOR OPTIMIZING WEED CONTROL SCHEDULE". Acta Horticulturae, n.º 319 (outubro de 1992): 665–70. http://dx.doi.org/10.17660/actahortic.1992.319.107.
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L. V. K. LIYANAGE e M. DE. S. LIYANAGE. "WEED CONTROL UNDERSTORY WEED MANAGEMENT IN COCONUT LANDS". CORD 8, n.º 01 (1 de dezembro de 1992): 34. http://dx.doi.org/10.37833/cord.v8i01.258.
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Coconut (Cocos nucifera L.) is by far the most extensively cultivated plantation crop in Sri Lanka. It is essentially a small holder crop comprising about 86% of small. holdings and homesteads and the balance belonging to the estate sector. The growth habit of the palm and its canopy structure requires a wide, spacing between palms, which permits abundant sunlight to the understory. As a result, the unutilised space beneath the plantation becomes invaded by a wide range of perennial and annual weed species. Such weeds invariably compete with coconut for soil moisture and nutrients, affecting its growth and yield and obstructing routine estate practices. Management of the understory weed growth is, therefore, considered an essential step in maintaining the plantation. In fact, the cost of weeding accounts for a substantial proportion of the total recurrent expenditure for maintenance.
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Case, L. T., H. M. Mathers e A. F. Senesac. "A Review of Weed Control Practices in Container Nurseries". HortTechnology 15, n.º 3 (janeiro de 2005): 535–45. http://dx.doi.org/10.21273/horttech.15.3.0535.
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Container production has increased rapidly in many parts of the U.S. over the past 15 years. Container production has been the fastest growing sector in the nursery industry and the growth is expected to continue. Weed growth in container-grown nursery stock is a particularly serious problem, because the nutrients, air, and water available are limited to the volume of the container. The extent of damage caused by weeds is often underestimated and effective control is essential. Various researchers have found that as little as one weed in a small (1 gal) pot affects the growth of a crop. However, even if weeds did not reduce growth, a container plant with weeds is a less marketable product than a weed-free product. Managing weeds in a container nursery involves eliminating weeds and preventing their spread in the nursery, and this usually requires chemical controls. However, chemical controls should never be the only management tools implemented. Maximizing cultural and mechanical controls through proper sanitation and hand weeding are two important means to prevent the spread and regeneration of troublesome weeds. Cultural controls include mulching, irrigation methods (subirrigation), and mix type. Nursery growers estimate that they spend $500 to $4000/acre of containers for manual removal of weeds, depending on weed species being removed. Economic losses due to weed infestations have been estimated at approximately $7000/acre. Reduction of this expense with improved weed control methodologies and understanding weed control would have a significant impact on the industry. Problems associated with herbicide use in container production include proper calibration, herbicide runoff concerns from plastic or gravel (especially when chemicals fall between containers) and the need for multiple applications. As with other crops, off-site movement of pesticides through herbicide leaching, runoff, spray drift, and non-uniformity of application are concerns facing nursery growers. This article reviews some current weed control methods, problems associated with these methods, and possible strategies that could be useful for container nursery growers.
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Sidik, Jatmiko Umar, Dad Resiworo Jekti Sembodo, Rusdi Evizal e Hidayat Pujisiswanto. "EFIKASI HERBISIDA PARAKUAT UNTUK PENGENDALIAN GULMA PADA BUDIDAYA KELAPA SAWIT (Elaeis guineensis Jacq) TANAMAN BELUM MENGHASILKAN". Jurnal Agrotek Tropika 8, n.º 2 (20 de maio de 2020): 355. http://dx.doi.org/10.23960/jat.v8i2.3910.
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Good plantation management is important to increase the productivity of immature oil palm plants, one of which is chemical weed control. This study aims to (1) determine the dosage of paraquat herbicide which is effective in controlling weeds in the area of immature oil palm plantations, (2) find out the differences in the composition of weed species on immature oil palm plates after application of the paraquat herbicide, (3) find out the phytotoxicity of paraquat herbicides in immature oil palm plants after the application of the paraquat dichloride herbicide. This research was carried out in the farmers' oil palm plantation in Jontor Village, Gayabaru District , Central Lampung Regency and Weed Laboratory of the Faculty of Agriculture, University of Lampung from November 2017 to February 2018. This research used a Randomized Block Design (RBD) with 4 replications and 6 treatments consisting dose of paraquat dichloride herbicide of 375g / ha, 500 g / ha, 625 g / ha, 750 g / ha, and mechanical weeding and without weed control (control). Homogeneity of the various data was tested by the Bartlett test, data additivity was tested by the Tukey test and the difference in the mean was tested with the Least Significant Difference (LSD) test at α 5 level. The result of the study showed that : (1) the herbicide paraquat dichloride dose of 375-750 g / ha effectively control weeds in total, weed leaf width of up to 8 week after application, weed grasses and weeds puzzle to 4 week after application, (2) the herbicide paraquat dichloride dose of 375-750 g / ha is effective in controlling Praxelis clematidea weeds up to 8 week after application, weed Ottochloa nodosa and Asystasia gangetica up to 4 week after application, (3) paraquate dichloride dosage levels 375-750 g / ha resulting in differences in weed composition at 4, 8 and 12 week after application , (4) dosages of 375 - 750 g / ha parakuat dichloride herbicides applied to dishes not poisoning immature oil palm plants.
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Holt, Jodie S. "Impact of Weed Control on Weeds: New Problems and Research Needs". Weed Technology 8, n.º 2 (junho de 1994): 400–402. http://dx.doi.org/10.1017/s0890037x00039002.
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Concerns in the public and agricultural sectors about the impacts of agricultural practices have led many weed scientists to refocus research efforts toward development of alternative strategies of weed management. To develop methods of weed management that will supplement or replace herbicides, the impacts of agricultural practices on weeds must be better understood. With a foundation of knowledge in basic weed biology, alternatives to herbicides can be made available in the future.
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Altland, James E., Charles H. Gilliam e Glenn Wehtje. "Weed Control in Field Nurseries". HortTechnology 13, n.º 1 (janeiro de 2003): 9–14. http://dx.doi.org/10.21273/horttech.13.1.0009.
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Herbicide use is an important component of weed management in field nursery crops. No single herbicide controls all weed species. Oxyfluorfen, simazine, and isoxaben are preemergence herbicides effective against broadleaf weeds. Oryzalin, pendimethalin, and prodiamine are effective in preemergence control of grasses and some small-seeded broadleaf weeds. Metolachlor is the only herbicide currently labeled for nursery crops that is effective in preemergence nutsedge (Cyperus) control. Fluazifop-butyl, sethoxydim, and clethodim are selective postemergence herbicides used for grass control. Glyphosate, paraquat, and glufosinate are nonselective postemergence herbicides used in directed spray applications for broad-spectrum weed control. Bentazon, halosulfuron, and imazaquin are effective postemergence nutsedge herbicides. These herbicides are discussed with respect to their chemical class, mode of action, labeled rates, and current research addressing their effectiveness in nursery crops.
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Masabni, Joseph G., e Dwight E. Wolfe. "RESIDUAL WEED CONTROL WITH FALL HERBICIDE APPLICATION IN APPLE AND PEACH". HortScience 40, n.º 3 (junho de 2005): 880c—880. http://dx.doi.org/10.21273/hortsci.40.3.880c.
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Flumioxazin (Chateau 51WG) is an herbicide for the preemergence and early postemergence control of broadleaves and grasses. Chateau was recently labeled for use in non-bearing fruit trees and bearing grapes. Long-term weed control in apple, peach, and blueberry was investigated following fall application of herbicides. Treatments consisted of simazine 2.8 kg a.i., norflurazon 2.24 kg a.i., napropamide 2.24 kg a.i., and oryzalin 2.24 kg a.i. were applied on 11 Nov. 2003. Flumioxazin was also applied at 0.1 and 0.43 kg ai on apple and peach. All treatments included glyphosate 1 lb a.i. for burndown control of preexisting weeds. Weed control evaluation in mid-April or 4 months after application showed that flumioxazin-treated plots had no weeds present and no weed regrowth. Plots treated with napropamide, norflurazon, and oryzalin showed significant regrowth of dandelion, common ragweed, and chickweed. Simazine plots had fewer weeds germinating than the other herbicides. By early June or 6 months after application, no differences in residual weed control were observed for all treated plots when compared to the control. All plots were equally weedy and required immediate floor management measures. It appears that flumioxazin weed control benefit was exhausted by 6 months after application, compared to 4 months for all other herbicides. Fall application of flumioxazin can eliminate the need for early spring weed control. This time saved can be spent on other important activities such as pruning and disease and insect control.
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Adewale Osipitan, O. "Weed Interference and Control in Cowpea Production: A Review". Journal of Agricultural Science 9, n.º 12 (15 de novembro de 2017): 11. http://dx.doi.org/10.5539/jas.v9n12p11.
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In spite of the great economic potential of cowpea as both domestic and commercial crop, a number of constraints, which include insect pests, diseases and weeds, limits its production in West and many parts of Africa. Weeds reduced cowpea yield and value by competing for light, water and nutrients. Cowpea suffers from weeds particularly when the crop is in the early growth stages before ground cover. Yield losses cause by weeds alone in cowpea production can be as high as 76% depending on the cowpea cultivar, environment and weed management practices. A timely weed removal at the critical period, which falls within the first 40 days of cowpea growth, would help to prevent an unacceptable yield. Weed management in cowpea has been with low technology. Hand weeding is the most widely used weed control method in cowpea but they are usually expensive and labour intensive. Cultural practices such as narrow row spacing and planting of early maturing varieties are also used for weed control in cowpea. Herbicides, which are relatively easy to use and less expensive, have not been widely adopted for weed control in cowpea. There are limited number of selective herbicides with wide spectrum for weed control in cowpea. However, an integrated practices that involved pre-emergence weed control using herbicides or physical weeding, and a supplementary weed removal that would ensure weed control up to 40 days after cowpea emergence could substantially prevent yield losses associated with weed interference.
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Johnson, W. Carroll. "A Review of Weed Management Challenges in Organic Peanut Production". Peanut Science 46, n.º 1 (1 de janeiro de 2019): 56–66. http://dx.doi.org/10.3146/ps18-12.1.
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ABSTRACT Organic peanut production is a high-risk cropping system, largely due to difficulties in managing weeds using methods acceptable for certified-organic production. In contrast with conventional peanut production that relies heavily on synthetic herbicides, organic peanut production must use an integrated system to manage weeds. The foundation for an integrated weed management system is cultural weed control which is a system of production practices that promote uniform peanut growth to suppress weeds. Cultural weed control includes practices that promote vigorous early-season peanut growth and lessen chances for weed escapes. Mechanical weed control is based on repeated cultivation using a tine weeder and sweep cultivator to control weeds before they emerge. However, weed control consistency from cultivation is affected by rainfall that can delay scheduled cultivations and hinder implement function. Handweeding is also a form of mechanical weed control that is used to supplement other weed control efforts by controlling escapes. Herbicides derived from natural products and thermal weed control using propane flaming have limited value in organic peanut production due to limited weed control spectra, specifically poor control of annual grasses and perennial weeds. Successful weed management in certified organic peanut production will depend on an integrated system, not a single form of weed control.
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زكى, محمد. "مكافحة الحشائش Control Weed". مجلة الفلاحة 84, n.º 1 (1 de janeiro de 2008): 51–83. http://dx.doi.org/10.21608/mflaha.2007.234468.
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