Letteratura scientifica selezionata sul tema "Weeds Cultural control"
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Articoli di riviste sul tema "Weeds Cultural control"
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Gunsolus, Jeffrey L. "Mechanical and cultural weed control in corn and soybeans". American Journal of Alternative Agriculture 5, n. 3 (settembre 1990): 114–19. http://dx.doi.org/10.1017/s0889189300003416.
Testo completoAbstract (sommario):
AbstractMany farmers and consumers are reevaluating chemical weed control because of the environmental risks of herbicides and their influence on farm size and diversity. This paper reviews research of the last 35 years on mechanical and cultural weed control in corn(Zea maysL.)and soybeans(Glycine maxL.).Soybeans can better use the weed control advantages of late planting and narrow row spacing and are less affected by early stand losses from mechanical weed control. In Minnesota, delaying planting to early June allows early germinating weeds to be controlled by preplant tillage but reduces the maximum yield potential of corn by approximately 25 percent and soybeans by approximately 10 percent. Narrow rows allow the crop canopy to close earlier, preventing emerging weeds from developing. However, in a nonchemical weed control system, the row spacing should allow for inter-row cultivation to control weeds that emerge with the crop. Up to a 10 percent reduction in crop stand may be expected in fields that have been rotary hoed. In Minnesota, a 10 percent stand loss results in a 2 percent loss of corn yield potential and no loss of soybean yield potential. Successful mechanical weed control is directly related to the timeliness of the operation. Rotary hoeing is effective on weeds that have germinated but not yet emerged but not on weeds that germinate from deeper than 5 cm, on no-till fields, or on fields with more than 20 to 30 percent crop residue. Inter-row cultivation is most effective on weeds up to 10 to 15 cm tall. Successful nonchemical weed control requires highly refined management skills and is as much an art as a science.
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Nalewaja, John D. "Cultural Practices for Weed Resistance Management". Weed Technology 13, n. 3 (settembre 1999): 643–46. http://dx.doi.org/10.1017/s0890037x00046339.
Testo completoAbstract (sommario):
Cultural practices, such as delayed crop seeding, tillage, black fallow, crop rotation, hand weeding, and competitive crops, when used to replace herbicides, provide an opportunity to reduce the selection pressure that causes weeds to become resistant to herbicides. Herbicides on the other hand reduce the selection pressure that causes weeds to resist cultural practices. Rotation of the two systems should then delay resistance to both systems. Growers consider many factors in addition to weed resistance in selecting herbicide or cultural weed control, from associated convenience to economic potential. Rotation of different types of weed control practices would delay resistance, compared to a continuous single practice. The extent of the delay depends upon genetics of resistance, weed reproduction characteristics, weed seed survival, and fitness of resistant weed plants. An understanding of the basic aspects of weeds and herbicides, as well as their interaction with the environment, would help in predicting the delay in resistance to an herbicide from use of cultural practices in the rotation. A grower's final choice of a weed control practice will involve available equipment, time, markets, and soil erosion in addition to potential weed resistance. Weeds that develop resistance to a control practice still allow for reversion to preresistance practices, an important component of a grower's decision. The rate of resistance development is dependent upon the removal of susceptible genes from the population and fitness of the resistant plants. Resistance might be delayed for many years or be manageable when the resistance is genetically recessive or resistant weeds are poorly fit. Growers may not want to accept alternative cultural practices as long as there is the potential for development of another herbicide or reversion to cultural control after resistance occurs.
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Mohler, Charles L. "Ecological Bases for the Cultural Control of Annual Weeds". Journal of Production Agriculture 9, n. 4 (ottobre 1996): 468–74. http://dx.doi.org/10.2134/jpa1996.0468.
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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. 3 (gennaio 2005): 535–45. http://dx.doi.org/10.21273/horttech.15.3.0535.
Testo completoAbstract (sommario):
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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Johnson, W. Carroll. "A Review of Weed Management Challenges in Organic Peanut Production". Peanut Science 46, n. 1 (1 gennaio 2019): 56–66. http://dx.doi.org/10.3146/ps18-12.1.
Testo completoAbstract (sommario):
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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Moody, Keith. "Weed Control in Wet-Seeded Rice". Experimental Agriculture 29, n. 4 (ottobre 1993): 393–403. http://dx.doi.org/10.1017/s0014479700021116.
Testo completoAbstract (sommario):
SummaryIncreasing transplanting costs in southeast Asia have encouraged farmers to adopt labour-saving crop establishment techniques for rice, such as wet seeding. This practice has been accompanied by an increase in weed problems and a shift in the dominant species to grassy weeds. Other problems are encountered with wet seeding but weeds are the most severe and most widespread constraint. It is impossible to produce rice economically without a well-planned weed control programme. The problems caused by weeds in wet-seeded rice and ways of controlling them by preventive, ecological, managerial, physical and chemical means are discussed in this paper. Herbicides are the most cost-effective weed control method in wet-seeded rice but there is a need to reduce the almost total reliance on them for weed control; cultural practices need to be integrated with judicious herbicide use. Worldwide concerns over environmental issues also need to be addressed.Control de malezas en el arroz de siembra húmeda
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Anderson, Randy L. "A cultural system to reduce weed interference in organic soybean". Renewable Agriculture and Food Systems 30, n. 4 (25 aprile 2014): 392–98. http://dx.doi.org/10.1017/s1742170514000167.
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AbstractOrganic producers are seeking alternative tactics for weed control, so that they can reduce their need for tillage. In this study, we examined cultural strategies for controlling weeds during the transition from a cool-season crop to soybean. The study was arranged as a two-way factorial, with factors being choice of cool-season crop and tillage treatments. The cool-season crops were either spring wheat harvested for grain or an oat–pea mixture harvested for forage. Five tillage treatments, ranging from intensive tillage to no-till, were established following each cool-season crop. Two tillage treatments included the cover crops, oat plus oilseed radish. Soybean was planted the following growing season. Each soybean plot was split into two subplots: weed-free and weed-infested. A cultural system comprising oat/pea as a preceding crop with no-till and cover crops reduced weed biomass in soybean 63% compared to intensive tillage. Reduced weed biomass resulted because of delayed weed emergence and lower weed community density. Consequently, soybean yielded 14% more in this treatment than with the intensive tillage treatment when weeds were present. Weed community composition also differed between the two systems; horseweed and field dandelion were prominent in no-till, whereas common lambsquarters, redroot pigweed and buffalobur were prevalent in the tillage control. Other treatments did not control weeds better than intensive tillage. A cultural system approach may minimize the need for tillage during the interval between cool-season crops and soybean.
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Knezevic, Stevan Z., e Avishek Datta. "The Critical Period for Weed Control: Revisiting Data Analysis". Weed Science 63, SP1 (febbraio 2015): 188–202. http://dx.doi.org/10.1614/ws-d-14-00035.1.
Testo completoAbstract (sommario):
There is an ever-larger need for designing an integrated weed management (IWM) program largely because of the increase in glyphosate-resistant weeds, not only in the United States but also worldwide. An IWM program involves a combination of various methods (cultural, mechanical, biological, genetic, and chemical) for effective and economical weed control (Swanton and Weise 1991). One of the first steps in designing an IWM program is to identify thecritical period for weed control(CPWC), defined as a period in the crop growth cycle during which weeds must be controlled to prevent crop yield losses (Zimdahl 1988).
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Abernathy, John R., e David C. Bridges. "Research Priority Dynamics in Weed Science". Weed Technology 8, n. 2 (giugno 1994): 396–99. http://dx.doi.org/10.1017/s0890037x00038999.
Testo completoAbstract (sommario):
For this presentation we would like to discuss some history of weeds and their control, the evolution of weed science, the development of herbicides and the changing dynamics of weed science research. As mentioned by previous speakers, weeds cause great loss to almost every crop production enterprise in the United States and around the world. Man has sought to control weeds by various methods including cultural practices, cultivation, hoeing, and with herbicides. Pioneer weed scientists were individuals trained in the areas of physiology, botany, and agronomy. They applied their knowledge and training to the understanding of growth, development, and control of weeds in the late 1800's and early 1900's.
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Propsom, Faye, e Emily Hoover. "Weed Seed Banks in Established Strawberry Fields". HortScience 33, n. 3 (giugno 1998): 459f—460. http://dx.doi.org/10.21273/hortsci.33.3.459f.
Testo completoAbstract (sommario):
Weed control in strawberries, either in a new planting or one that is established, is a major source of problems for growers in Minnesota. To control weeds, growers need to know which weeds are a problem, which weeds are deleterious, and which weeds have the potential to become a problem. Weeds present, soil type, and weed seed bank information are needed in order to predict potential weed problems. With different weed control practices applied between and within the rows, we assumed weed seed bank populations would vary. In addition, we were interested in seeing if the seed banks differed between soil types and individual farmer's cultural practices. Soil samples were collected from 13 commercial strawberry fields located around the Twin Cities metro area. In 1996, samples were taken after renovation and before mulch was applied. In 1997, they were taken after mulch was removed and prior to renovation. The soil samples for each date, treatment, and farm were dried, and organic matter was separated from inorganic. The weed seeds were removed from the remaining organic matter, identified and counted. Soil types and cultural practices were used to compare the differences among the farms.
Tesi sul tema "Weeds Cultural control"
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Tripp, Timothy A. "Cultural control of broadleaf weeds in turfgrass swards". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ27549.pdf.
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Mkhonta, Vusumuzi Meshack. "The biology and cultural control of grass-weeds in smallholder maize cropping systems". Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430913.
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Gaongalelwe, Motlhasedi Olebile. "Effect of delayed sowing and increased crop density on weed emergence and competition with wheat". Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09AFM/09afmg2118.pdf.
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Lacroix, Mireille 1958. "Cropping to suppress yellow nutsedge (Cyperus esculentus L.)". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65450.
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Neeser, Christophe. "Rhizome bud production and growth characteristics of clonal colonies in two biotypes of quackgrass (Elytrigia repens (L.) Nevski)". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56676.
Testo completoAbstract (sommario):
This study examined the effect of density on rhizome bud production in quackgrass (Elytrigia repens (L.) Nevski). The treatments consisted of two biotypes (L8 and L9), and nine density levels ranging from 1 to 22 plants m$ sp{-2}$. The results showed that bud production per plant diminished with increasing density in both biotypes. However, biotype L8 was less productive at low densities, but almost equal to L9 at higher densities. A second experiment was undertaken to measure the expansion of clonal colonies and the distribution of shoots within these colonies. For both biotypes the growth rate was highest in late summer and early fall, but colonies of L9 grew more rapidly. Biotype L9 had 59% of its total biomass located within 40 cm of the centre as compared with 81% in L8. Overall, Biotype L9 produced more rhizome buds, responded more strongly to intraspecific interference, and grew more rapidly as a colony.
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Bradley, Kevin Wayne. "Characterization of the Mechanism of Resistance of a Johnsongrass (Sorghum halepense) Biotype to Selected Graminicides in Virginia and Response of Mugwort (Artemisia vulgaris) to Specific Herbicidal and Cultural Control Strategies". Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27343.
Testo completoAbstract (sommario):
Johnsongrass [Sorghum halepense (L.) Pers.] and mugwort (Artemisia vulgaris L.) are both rhizomatous perennial weeds that are capable of rapidly colonizing a variety of different environments. Separate experiments were conducted throughout Virginia from 1996 to 1999 to determine more effective methods for reducing infestations of these perennial weeds in the future. Field and greenhouse experiments conducted on a resistant johnsongrass population discovered in New Kent County, Virginia revealed that this biotype exhibits low levels of resistance to the aryloxyphenoxypropionate (APP) herbicides quizalofop-P and fluazifop-P and the cyclohexanedione (CHD) herbicide sethoxydim. Additional laboratory experiments revealed that resistance is not due to differential absorption, translocation, or metabolism of the APP and CHD herbicides in the resistant vs. the susceptible biotype. However, acetyl-coenzyme A carboxylase (ACCase) assays revealed that resistance to the APP and CHD herbicides is conferred by an overproduction of the ACCase enzyme in the resistant compared to the susceptible johnsongrass biotype. In field experiments conducted on mugwort infestations discovered in several counties throughout Virginia, 100% mugwort control was achieved with standard application rates of picloram at 4 months after treatment (MAT), and also greater than 70% mugwort control was achieved with the higher application rates of clopyralid, glyphosate, and dicamba at 4 MAT. However, all other herbicides evaluated in these experiments provided less than 65% mugwort control at 4 MAT, even at exceptionally high use rates. Additionally, the results from these trials revealed that sequential herbicide applications and sequential mowings prior to herbicide application are both effective mugwort control strategies.Ph. D.
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Oliveira, Odiluza Maria Saldanha de. "Capacidade competitiva de cultivares de feijão-caupi (Vigna unguiculata (L.) Walp) combinada com espaçamento na supressão de plantas daninhas". Universidade Federal do Amazonas, 2014. http://tede.ufam.edu.br/handle/tede/4360.
Testo completoAbstract (sommario):
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FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas
The weed interferencein in crop areas of cowpea reduces their yield of cowpea at 90%, varying in intensity that depends on factors related to weeds community Among the options for weed management, is the cultural method in which the use of cultivars with high competitive ability coupled with narrow row spacing provides conditions for the culture to be established effectively on the soil surface. However, in order not to compromise the yield of cowpea proper use of plant density, which depends on the intrinsic characteristics of the cultivar as size, growth habit, plant architecture and management system used is required. Analysis of the correlation coefficient is a complementary tool to assess the contribution of each factor in the productivity of cowpea under this stress situation. The objective of this experiment was to evaluate the competitiveness of cowpea cultivars at different spacings in upland soil in the state of Amazonas. The experimental design was a randomized complete block with three replications, arranged in sub-subplots. In the plots was used the row spacings of 0,50 m (recommended); 0,40 m and 0,30 m; in the subplots two system of control of weeds, and in sub-subplots cultivars of cowpea caupi BR8 Caldeirão, IPEAN V69, BRS Guariba e BR 17 Gurguéia. Were evaluated: leaf area, dry weight of leaves and of the aerial part, size of pods, number of pods per plant, number of pods, number of seeds per pod, harvest index, one hundred seed weight and yield, leaf area ratio, specific leaf area and leaf area index. Weed evaluation was carried at intervals of 7 days with the use of a square of 0.25 m2 that was carried out with in the useful area subplot for identification, counting and collecting weeds bounded by the square to verify the dry weight of shoots. The phytosociological parameters of frequencies, densities and abundances relative and absolute indices and importance value of species were calculated. It was used the path analysis to decompose the different correlations and their direct and indirect effects. The cv. BR8 Caldeirão had the highest values for measured characteristics followed in order of decreasing values for BRS Guariba, BR 17 Gurguéia IPEAN V69 viii respectively. The yield of cvs. showed a similar trend to the other variables analyzed. The spacing between rows of plants was not significant for productivity, but the cultivars differed from each other between different linear arrangements. The weeds highest IVI in row spacing of 0,5 e 0,4 m were Croton glandulosus and Mimosa pudica for 0,3 m. The most important species for the quantity cvs. were Paspalum multicaule for BR8 Caldeirão, Elephantopus mollis to BRS Guariba and Cleome affinis to IPEAN V69 and BR 17 Gurguéia. IPEAN V69 was the most susceptible to weed competition for dry matter production.The number of pods per plant and leaf area were the features most correlated with productivity. These features showed to be efficient for indirect selection to obtain genetic gains on the productivity of grains. Moreover, these features are also important on the indirect effects of the number of seeds per pod, plant height and dry weight of the aerial parts.
Plantas daninhas em área de cultivo de feijão-caupi causam interferência que pode reduzir a obtenção de grãos em até 90%, o que dependerá de fatores ligados à comunidade infestante. Dentre as opções de manejo das plantas daninhas, encontra-se o método cultural em que o uso de cultivares com elevada capacidade competitiva aliado à redução do espaçamento entrelinhas fornece condições para que a cultura se estabeleça eficazmente na superfície do solo. Entretanto, para não comprometer a produtividade da cultura de feijão-caupi é necessária a utilização adequada da densidade das plantas, o que depende das características intrínsecas da cultivar como porte, hábito de crescimento, arquitetura de planta e do sistema de manejo utilizado. Para quantificar a contribuição de cada fator na produtividade do feijão-caupi nesta situação de estresse competitivo é realizada complementarmente a análise de coeficiente de correlação. O objetivo deste experimento foi avaliar a capacidade competitiva de cultivares de feijão-caupi em diferentes espaçamentos em solo de terra firme no estado do Amazonas. O experimento foi delineado em parcelas sub-subdivididas em blocos casualizados com três repetições. Na parcela foram usados os espaçamentos de 0,50 m (recomendado); 0,40 m e 0,30 m; nas subparcelas os dois sistemas de manejo das plantas daninhas com e sem capina e nas sub-subparcelas as cultivares de feijão-caupi IPEAN V69, BR8 Caldeirão; BRS Guariba; BR 17 Gurguéia. Foram determinadas a área foliar, massa seca das folhas e da parte aérea, tamanho das vagens, número de vagens por planta, número total de vagens, número de sementes por vagem, índice de colheita, peso de cem sementes e produtividade, razão da área foliar, área foliar especifica e índice de área foliar. A avaliação da infestação de plantas daninhas foi realizada em intervalos de 7 dias com a utilização de um quadrado de 0,25 m2, lançado aleatoriamente na área útil da sub-subparcela não-capinada para identificação, contagem e coleta das plantas daninhas delimitadas pelo quadrado para verificar a massa seca da parte aérea. Foram calculados os parâmetros fitossociológicos das espécies. Estimou-se as vi correlações genotípicas entre pares de caracteres e seus efeitos diretos e indiretos considerando os componentes de produção. A cv. BR8 Caldeirão apresentou os maiores valores para as características avaliadas, seguida respectivamente em ordem decrescente de valores por BRS Guariba, BR 17 Gurguéia e IPEAN V69. A produtividade das cvs. seguiu tendência similar às demais variáveis analisadas. Os espaçamentos entre linhas não foram significativos para a produtividade, mas as cultivares diferiram entre si dentro de cada espaçamento. As plantas daninhas com maior IVI foram Croton glandulosus nos espaçamentos de 0,5 e 0,4 m, Mimosa pudica para 0,3m e Paspalum multicaule para BR8 Caldeirão, Elephantopus mollis para BRS Guariba e Cleome affinis para IPEAN V69 e BR 17 Gurguéia. A cultivar IPEAN V69 foi a mais susceptível aos problemas de competição com a flora infestante quanto à produção de matéria seca. O número de vagens.planta-1 e a área foliar foram os caracteres mais correlacionados com a produtividade e se mostram eficientes em praticar-se seleção indireta, com o intuito de obter ganhos genéticos sobre o rendimento de grãos. A cultivar BR8 Caldeirão foi a que demonstrou maior habilidade competitiva com base nos parâmetros avaliados.
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Brak, Bastiaan. "Modelling weed population dynamics : impact of cultural control and climate change". Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2743/.
Testo completoAbstract (sommario):
Over the last three decades, concern about food safety and the management of natural resources has increased. Instigated by the previous EU pesticide review, (EU 91/414) carrot growers in particular have been hit by the revocation of several post-emergence herbicides. There is real concern among growers that this may impair profits. To identify alternative weed control strategies, a modelling framework capable of simulating the impact of alternative weed management strategies on long-term weed population dynamics, was proposed. Scentless mayweed (Tripleurospermum inodorum) was chosen as model weed species. The system represented in ECOSEDYN (Effects of Cultural control and climate On SEedbank DYN For each component model in ECOSEDYN the literature was reviewed to identify the best mathematical representation and then the model was parameterised. To improve accuracy of model projections and address gaps in knowledge, field experiments were conducted in two areas: soil cultivation, and plant growth and reproduction. The results of the cultivation experiments revealed that key assumptions in models for weed seed re-distribution are incorrect. The experiments focusing on plant growth and reproduction resulted in a novel approach to the modeling of biomass increase, flowering and seed shedding where the different processes were quantitatively and temporally linked using Beta functions. amics), comprises a six-year crop rotation: one year of carrot and five years winter wheat and repeated four times. The weed management strategies consist of combinations of cultural control measures (sowing time and crop maturity time). In addition, the interaction of climate with the cultural control measures was assessed by implementing two future climate scenarios, (‘No change’ vs ‘Heating up’) based on weather data over the last 18 years. The results of the ECOSEDYN simulations showed that, regardless of the prevailing climate, choosing a fast maturing carrot cultivar is by far the most important factor in maintaining the weed seedbank low. In addition, the risk for higher seedbank levels in the long-term under ‘Heating up’ climate is largest if carrot is continuously sown late.
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Kolo, Musa G. Matthew. "A comparative study of the biology of Cirsium arvense (L.) Scop. and Equisetum arvense L. in relation to their cultural control". Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262613.
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Adoryan, Marcio Luiz. "Efeitos de densidades de Aeschynomene rudis Benth e seu controle com o herbicida Ethoxysulfuron em duas épocas de aplicação na cultura do arroz (Oryza sativa L.) irrigado". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-14012005-082507/.
Testo completoAbstract (sommario):
Com o objetivo de avaliar os efeitos de densidades de Aeschynomene rudis Benth. na cultura do arroz irrigado e a eficiência do herbicida ethoxysulfuron aplicado em duas épocas como pós-emergente, foi instalado um experimento no município de Taubaté, região do Vale do Paraíba-SP, no ano agrícola de 2001/2002. O cultivar de arroz Epagri 109 e a planta daninha A. rudis foram semeados em 30/10/2001 em solo drenado. Os tratamentos foram constituídos de quatro densidades de A. rudis (3, 6, 12 e 24 plantas por metro quadrado) e duas épocas de aplicação do herbicida ethoxysulfuron dentro de cada densidade (estádio de 4 e 6 folhas do A. rudis), e cinco parcelas testemunhas com densidades de 0, 3, 6, 12 e 24 plantas de A. rudis por metro quadrado sem a aplicação do produto, constituindo 13 tratamentos com 4 repetições, delineados em blocos ao acaso. O herbicida foi aplicado na dose de 80 g.ha-1, sendo adicionado à calda o adjuvante lauril éter sulfato de sódio na dose de 0,3 % base volume, e as pulverizações efetuadas nos dias 27/11/2001 e 04/12/2001. Os parâmetros avaliados foram: número de plantas, colmos e panículas por metro, altura das plantas de arroz, comprimento de panículas, número de espiguetas por panícula, número de grãos formados por panículas, rendimento de grãos, eficiência do herbicida no controle de A. rudis e fitointoxicação à cultura. Considerando-se os resultados obtidos pode-se concluir que: a) densidades de 3, 6, 12 e 24 plantas de A. rudis por metro quadrado, influenciam negativamente de forma linear, o número de colmos e de panículas por metro, o comprimento das panículas, o número de espiguetas e de grãos formados por panícula, o rendimento de grãos e o índice para colheita mecânica e não afetam o número de plantas por metro e a altura das plantas de arroz. b) o herbicida ethoxysulfuron é eficiente no controle de A. rudis nos estádios de 4 e de 6 folhas, nas densidades de 3, 6, 12 e 24 plantas por metro quadrado. c) ethoxysulfuron na dose de 80 g.ha-1, quando aplicado em pós-emergência precoce e mediana em densidades de 3, 6, 12 e 24 plantas de A. rudis por metro quadrado é seletivo para o cultivar de arroz Epagri 109, não interferindo nos parâmetros avaliados.During the season 2001/2002, an experiment was conducted in Taubaté city, area of the Paraíba-SP valley, to evaluate the effect of Aeschynomene rudis Benth. densities on paddy rice, and the efficacy of the herbicide ethoxysulfuron applied in early and mid post emergence. The rice variety Epagri 109 and A. rudis were planted October 30, 2001 in dry soil. The treatments were four A. rudis densities (3, 6, 12 and 24 plants per square meter) and two application timings of the herbicide ethoxysulfuron in each density. The two application timings were at the 4 and 6 leaf stage of A. rudis. There were also untreated densities of 0, 3, 6, 12 and 24 plants of A. rudis per square meter without the herbicide application, resulting in 13 treatments with 4 replications delineated in randomized blocks. The herbicide was applied at 80 g.ha-1, with the adjuvant laurel ether sulfate of sodium at .3% v/v. The applications were made on November 27 and December 4, 2001. The assessed crop parameters were: number of plants, stems and panicles per meter, height of the plants, panicle length, number of spikelets by panicle, number of grains formed by panicles, income of grains, A. rudis control and crop damage. We can conclude from the results that A. rudis densities of 3, 6, 12 and 24 plants per square meter influence the crop negatively, in a linear way, the number of stems and panicles per meter, the length of the panicles, the number of spikelets and grains formed by panicles, the mechanical harvest index, and rice yield. There were no effects on the number of rice plants per meter or the height of the rice. Also, ethoxysulfuron was effective in controlling A. rudis at both the 4 and 6 leaf stage, in densities of 3, 6, 12 and 24 plants per square meter. Ethoxysulfuron at 80 g.ha-1, when applied early post or mid post emergence in densities of 3, 6, 12 and 24 plants per square meter was selective to the rice variety Epagri 109, not affecting the assessed parameters.
Libri sul tema "Weeds Cultural control"
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Walters, Charles. Weeds--control without poisons. Kansas City, Mo: Acres U.S.A., 1991.
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MacLean, Jayne T. Cultural or mechanical weed control: January 1979 - April 1991. Beltsville, Md: National Agricultural Library, 1991.
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Gold, Mary V. Cultural and mechanical weed control: January 1991 - April 1994. Beltsville, Md: National Agricultural Library, 1994.
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MacLean, Jayne T. Cultural and mechanical weed control, January 1979 - January 1990. Beltsville, Md: National Agricultural Library, 1990.
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Hansen, Edward A. Weed control using herbicides in short-rotation intensively cultured poplar plantations. [Saint Paul, Minn.]: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station, 1985.
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Ryan, una s. endothelial cells: Vol. 1. Boca Raton, FL: CRC Press, 1995.
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Walters, Charles. Weeds, Control Without Poisons. 2a ed. Acres U.S.A., 1996.
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R, Durgan B., e Minnesota Extension Service, a cura di. Cultural & chemical weed control in field crops. St. Paul, MN: Minnesota Extension Service, University of Minnesota, College of Agriculture, 1995.
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Craig, Cramer, a cura di. Controlling weeds with fewer chemicals: How to cut your herbicide costs and protect the environment. Emmaus, PA: Rodale Institute, 1991.
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Mendes, Kassio Ferreira. Atualidades no manejo de plantas daninhas em hortaliças fruto. Brazil Publishing, 2020. http://dx.doi.org/10.31012/978-65-5861-174-5.
Testo completoAbstract (sommario):
An integrated weed management system is perfectly aligned with the aim of producing healthy and environmentally sustainable vegetables. This integrated management is fundamental for vegetables, more than in other crops, due to its high commercial value, intensive culture, lack of competitiveness and low availability of registered herbicides. The integration of available weed control methods with a long-term strategy based on preventive and agronomic (cultural) practices is necessary to obtain a desired level of control, decrease the accumulation of the weed seed bank, increase weed diversity and decrease herbicide dependence and minimize their negative impacts. Thus, this book provides essential and updated subjects of information regarding the general characteristics of fruit vegetables, critical periods of control, main weeds in the crop, integrated management methods (preventive, cultural, physical, mechanical, biological and chemical); and it is intended for professors, researchers, extensionist, undergraduate and graduate students, rural producers and other professionals involved in the area of weed science.
Capitoli di libri sul tema "Weeds Cultural control"
1
Zonneveld, Norbert, e Hans Van Zon. "The Biology and Culture of Grass Carp (Ctenopharyngodon Idella), with Special Reference to Their Utilisation for Weed Control". In Recent Advances in Aquaculture, 119–91. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-8736-7_4.
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Kaur, Tamanreet, e Mandeep Kaur. "Integrated Pest Management: A Paradigm for Modern Age". In Pests, Weeds and Diseases in Agricultural Crop and Animal Husbandry Production. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92283.
Testo completoAbstract (sommario):
Integrated pest management is an effective and environmentally sensitive approach for pest management. It plays an important role in sustainable agriculture and quality of food production by providing maximum economic yield to the farmer and also improving human health and environment. Recent developments in agricultural technology, modern communication tools, changing consumer trends, increased awareness for sustainably produced food systems, and globalization of trade and travel, have necessitated the need for the IPM paradigm as appropriate for modern times. Although the concept of integrated pest management originated almost 60 years ago, currently integrated pest management is a robust paradigm of pest control around the globe. This chapter reviews the history of integrated pest management, its main principles, and components of integrated pest management such as host plant resistance, cultural control, behavioral control, mechanical/physical control, biological control, and chemical control.
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"Environmental Aspects of White Amur Culture". In Weed Control Methods for Public Health Applications, a cura di Edward O. Gangstad, 181–86. CRC Press, 2018. http://dx.doi.org/10.1201/9781351077699-16.
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Paspatis, E. A. "Chemical, cultural and biological control of Oxalis pes-caprae in vineyards in Greece". In Weed Control on Vine and Soft Fruits, 27–29. CRC Press, 2021. http://dx.doi.org/10.1201/9781003211419-6.
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Opuszynski, Karol, e Jerome V. Shireman. "Utilization of Grass Carp for Aquatic Weed Control". In HERBIVOROUS FISHES: Culture and Use for Weed Management, 135–58. CRC Press, 2019. http://dx.doi.org/10.1201/9780429266461-5.
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Zonneveld, Norbert, e Hans Van Zon. "The Biology and Culture of Grass Carp (Ctenopharyngodon Idella), with Special Reference to Their Utilisation for Weed Control". In Recent Advances in Aquaculture, 119–91. Routledge, 2019. http://dx.doi.org/10.4324/9780429303937-4.
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Fox, Michael H. "About Those Accidents". In Why We Need Nuclear Power. Oxford University Press, 2014. http://dx.doi.org/10.1093/oso/9780199344574.003.0017.
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A nuclear power plant is undergoing an emergency shutdown procedure known as a “scram” when there is an unusual vibration and the coolant level drops precipitously. Subsequent investigation by a shift supervisor reveals that X-rays of welds have been falsified and other problems exist with the plant that could potentially cause a core meltdown that would breach the containment building and cause an explosion. However, the results of the investigation are squelched and the plant is brought up to full power. The shift supervisor takes the control room hostage but is then shot by a SWAT team as the reactor is scrammed. A meltdown does not actually occur. No, this did not really happen, but these events—portrayed in the movie The China Syndrome —evoked a scenario in which a nuclear core meltdown could melt its way to China and contaminate an area the size of Pennsylvania. It also exposed a nuclear power culture that covered up safety issues rather than fixing them. It made for a compelling anti-nuclear story that scared a lot of people. And then a real core meltdown happened, 12 days later. The worst commercial nuclear power reactor accident in US history began on Three Mile Island, an island in the Susquehanna River three miles downstream from Middletown, Pennsylvania (hence its name). Two nuclear reactors were built on this island, but one of them (TMI-1) was shut down for refueling while the other one (TMI-2) was running at full power, rated at 786 MWe. At 4:00 a.m., what should have been a minor glitch in the secondary cooling loop began a series of events that led to a true core meltdown, but no China syndrome occurred and there was little contamination outside the plant. Nevertheless, it caused panic, roused anti-nuclear sentiment in the country, and shut down the construction of new nuclear power plants in the United States for decades. The nuclear reactors at Three Mile Island were pressurized water reactors (PWR), the type of reactor that Admiral Rickover had designed for power plants in US Navy nuclear submarines.
Atti di convegni sul tema "Weeds Cultural control"
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Takagi, Yuta, Toshihiko Shiraishi, Shin Morishita, Ryohei Takeuchi, Tomoyuki Saito e Yuko Mikuni-Takagaki. "Effects of Mechanical Vibration on Matrix Production and Proliferation of Three-Dimensional Cultured Chondrocytes". In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66805.
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This paper describes the effects of vibration stimulation on chondrocytes in three-dimensional culture in relation to the production of regenerative cartilage tissue, using collagen artificial skin as a carrier and supplementation with hyaluronic acid (used in the conservative treatment of osteoarthritis), and the mechanism of the adaptive response of chondrocytes to mechanical loading. The experimental condition imitates an environment of articular cartilage in vivo that chondrocytes are completely surrounded by the extracellular matrix and receives mechanical stimulation for the weight-bearing mechanics. Chondrocytes were isolated from articular cartilage of porcine metatarsophalangeal joints. Experiments were performed under four different culture conditions: control condition, in which chondrocytes were cultured with atelocollagen gel and collagen artificial skins, and no vibration (HA−Vib−); HA−Vib+, in which chondrocytes were cultured in atelocollagen gel and collagen artificial skins with vibration treatment for 2 weeks; HA+Vib−, in which chondrocytes were cultured in medium containing 0.1% hyaluronic acid; and HA+Vib+, in which chondrocytes were cultured in medium containing 0.1% hyaluronic acid with vibration treatment for 2 weeks. Histologic analysis was conducted at 14 days of culture. The proliferation of chondrocytes was obtained by counting the number of cells with a hemocytometer after 3, 7, 10, and 14 days of culture. The expression of Sox 9 and β-catenin was detected by western blotting analysis. Sox 9 has been reported of involvement in transcription of type IX collagen that binds cartilage-specific type II collagen fibrils. β-catenin plays an important role of signaling pathways of cell proliferation although the relationship between β-catenin and mechanical vibration stimulation has not been clarified yet. The obtained results are as follows. The mechanical vibration enhanced the thickness of extracellular matrix of chondrocytes in histologic section at 14 days of culture and increased the expression of Sox 9. In addition, the mechanical vibration significantly increased the number of chondrocytes after 10 days of culture and promoted the expression of β-catenin. These results show that mechanical vibration promotes the matrix production and proliferation of chondrocytes and that a part of important signaling pathways in relation to mechanical vibration stimulation and proliferation of chondrocytes has been revealed.
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Popchenko, M. I. "Legal regulation of crop seed with weed seeds in Canada". In Растениеводство и луговодство. Тимирязевская сельскохозяйственная академия, 2020. http://dx.doi.org/10.26897/978-5-9675-1762-4-2020-151.
Testo completoAbstract (sommario):
The quality control of crop seed lots for the content of weed seeds for sale in Canada, export or import is carried out the basis of two legislative acts: the Seed Regulations and the Weed Seeds Order. The Seed Regulations contain information about sampling of various crops and requirements for seeds depending on the culture and crop seeds class. The Weed Seeds Order contains list of divided into classes of noxious weed species, whose seeds are counted in seed lots of agricultural crops.
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Grimm, Brian A., Brooke A. Lahneman, Peter B. Cathcart, Robert C. Elgin, Greg L. Meshnik e John P. Parmigiani. "Autonomous Unmanned Aerial Vehicle System for Controlling Pest Bird Population in Vineyards". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89528.
Testo completoAbstract (sommario):
Pest birds have long been a significant source of crop loss for grape growers, especially during the critical weeks leading up to harvest when grape sugar levels are high. In Oregon’s Willamette Valley, vineyards have seen a marked increase in crop loss in the last few years despite widespread use of intrusive gas cannons/shotguns and expensive netting systems. In order to deter this pest bird population, we have created an Unmanned Aerial Vehicle (UAV) package capable of autonomous flight, which incorporates common pest bird scare tactics into this dynamic platform. The system has been designed to launch, complete its mission waypoints, and land completely under autonomous control. By using this autonomous guidance system, we are able to employ visual, auditory, and predator mimicry pest bird control techniques in such a way as to discourage habituation. While radio controlled UAVs have been used for bird control in airport settings for many years, these systems require a trained operator to constantly guide the aircraft. The autonomous UAV system was designed for operation by an existing vineyard employee with minimal training. To capture widely accepted pest bird control techniques and management culture of Willamette Valley vineyards and gain information for design, implementation, and industry acceptance of this UAV project, we surveyed the owners of 225 local vineyards. Survey results indicated that vineyard owners are open to implementing innovative pest bird control methods that do not affect the terroir of their vineyards and that could replace the use of netting, which they do not view favorably despite its being the most effective pest bird control method to date. Results also indicated that pest birds are most damaging to a vineyard’s perimeter and that many vineyards employ someone to patrol this perimeter with a shotgun loaded with cracker shells. The UAV system is able to traverse the airspace above this perimeter without interfering with neighboring homes or beneficial predators in the area. By using proven pest bird control methods in an autonomous UAV system, we designed a device that brings an innovative solution to vineyard owners.
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Baker, Brendon M., Amy M. Silverstein, Roshan P. Shah e Robert L. Mauck. "Engineering the Functional Maturation of Nanofiber-Based Human Meniscus Tissue". In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19685.
Testo completoAbstract (sommario):
The meniscus is a fibrous tissue essential to healthy knee mechanics. It functions to redirect vertical forces laterally, converting compressive into tensile loads which are taken up by an array of highly organized collagen fibers. Load transmission is not only the operative mode of the meniscus, but is also required for normal development and homeostatic maintenance [1]. With injury, disruption of the aligned collagen fiber architecture impairs function, altering joint loading and initiating osteoarthritis. Toward engineering replacement meniscus tissue, we have investigated scaffolds of aligned electrospun nanofibers that direct cell orientation and provide a suitable microenvironment for the deposition of organized extracellular matrix (ECM) (Fig 1) [2]. In previous work, human meniscus fibrochondrocytes (MFCs) seeded on such scaffolds formed robust ECM with commensurate increases in tensile properties [3]. After 10-weeks of static, free-floating culture, however, mechanical properties still fell short of native tissue values. Over this time course, full-thickness MFC colonization was not observed due to the tight packing of nanofibers, although better infiltrated constructs revealed larger improvements in tensile properties. To accelerate cell ingress, we next explored composite scaffolds containing slow eroding poly(e-caprolactone) (PCL) fibers and water-soluble poly(ethylene oxide) (PEO) fibers that augment pore size when removed (Fig 4A-D) [4]. Based on this precedent, the current study explored two strategies for improving the maturation of MFC-laden nanofibrous constructs: dynamic tensile loading mimicking the in vivo mechanical environment and inclusion of sacrificial PEO fibers to enhance cell infiltration. We hypothesized that dynamic control of the mechanical and material microenvironment would improve matrix production and lead to enhanced mechanical properties.
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Wha Lin, Shu, J. Ware, H. Roberts, N. McGraw, W. McAllister e D. Stafford. "EXPRESSION OF HUMAN FACTOR IX IN MAMMALIAN CELLS". In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643567.
Testo completoAbstract (sommario):
Human factor IX has been expressed in mammalian cells. A cloned factor IX cDNA missing the first 15 nucleotides of the 5’ end was modified by in vitro mutagenesis to restore the missing codons and add the translation consensus sequence, CCACC, proposed by Kozak to be optimal for translational initiation. Additionally, Bgl II and BamHI sites were added immediately upstream of the CCACC sequence for ease of portability of the fragment. This modified cDNA was inserted into a bovine papillomavirus (BPV) vector under the control of a mouse met alio thionein promoter. The constructed plasmid pBPV-IX was used to transfect a mouse fibroblast cell line C127. After 3 weeks, the transformed foci were isolated and the established cell lines were grown in the presence or absence of vitamin K. Media was collected at 3 day intervals and assayed for factor IX activity in a one stage clotting assay. A standard curve was constructed using purified human factor IX. Cells grown in the presence of vitamin K (3 mg/L) exhibited an activity equivalent to 350 ng/ml of factor IX in the cell media; no (less than 3 ng/ml) activity was detectable in the absence of vitamin K. A monoclonal antibody column specific for the Ca++ dependent form of human factor IX allowed the isolation of approximately 7 ug of purified factor IX from approximately 100 ml of culture medium. Western blot analysis of the purified factor IX revealed 2 protein bands which reacted with a goat anti-human factor IX antibody as well as a human specific monoclonal antibody. One of the immunoreactive bands migrates with authentic human factor IX and the other migrates slower. This expression system provides a convenient way to produce suitable amounts of factor IX and mutated factor IX protein for functional analyses.
Rapporti di organizzazioni sul tema "Weeds Cultural control"
1
Hansen, Edward A., e Daniel A. Netzer. Weed control using herbicides in short-rotation intensively cultured poplar plantations. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1985. http://dx.doi.org/10.2737/nc-rp-260.
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