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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 101
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A Dynamic Optimisation Model of Weed Control AgEcon
Cacho, Oscar J.; Jones, Randall E..
It is argued in this paper that static approaches to weed management, where the benefits and costs are only considered within a single season, are inappropriate for assessing the economic benefits of weed control technologies. There are carryover effects from weed management as weeds that escape control in one season may reproduce and replenish weed populations in following seasons. Consequently, it is appropriate to view weed control in the context of a resource management problem where the goal is to determine the optimal inter-temporal level of weed control that maximises economic benefits over some pre-determined period of time. A dynamic optimisation model for weed control is presented. Using the tools of comparative static analysis and Pontryagin's...
Tipo: Working or Discussion Paper Palavras-chave: Weed control; Resource economics; Optimal control; Dynamic programming; Wild oats; Farm Management.
Ano: 2000 URL: http://purl.umn.edu/12902
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Activities and Novel Applications of Secondary Metabolite Coumarins Planta Daninha
HUSSAIN,M.I.; QAMAR ABBAS,S.; REIGOSA,M.J..
ABSTRACT: This review covers biological activity of secondary metabolites, coumarin and their derivatives on different organisms (pests, pathogens, weeds), as well as their applications in agriculture as eco-friendly pesticides and weed control agents. Naturally occurring coumarins have shown biological and allelopathic potential on a broad range of organisms. Coumarin inhibits seed germination, root growth, morphology, histology, water uptake, respiration, photosynthesis, cell elongation, cell división and differentiation. Coumarin demonstrate excellent insecticidal potential against eggs, larvae and adult insects. Coumarin showed antifeedent responses in a wide range of memebers from invertebrates to vertebrates. The information provided in this review...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coumarin; Secondary metabolites; Multifunctionality; Herbivory; Allelopathy; Phytotoxicity; Weed control.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100220
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Agronomic studies of corn and sorghum during 1977 Thai Agricultural
Supot Faungfupong; Wasana Wongyai; Kittima Montranon; Surapol Chowchong.
12 tables
Palavras-chave: Corn; Maize; Sorghum; Growth; Nitrate reductase; Agronomic characters; Dry weight; Nitrogen fertilizers; Weed control; Yields; ข้าวโพด; ข้าวฟ่าง; การเจริญเติบโต; การแข่งขันกับวัชพืช.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3921
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Allelopathic Activity of Crop Residue Incorporation Alone or Mixed Against Rice and its Associated Grass Weed Jungle Rice (Echinochloa colona [L.] Link) Chilean J. Agric. Res.
Khaliq,Abdul; Matloob,Amar; Ata Cheema,Zahid; Farooq,Muhammad.
Weed suppression is one of the several benefits achieved by soil incorporation of crop residues and such suppression is believed to be allelopathic in nature. The allelopathic potential of different crop residues: viz. sorghum (Sorghum bicolor [L.] Moench), sunflower (Helianthus annuus L.), brassica (Brassica campestris L.) was evaluated in rice (Oryza sativa L.) and jungle rice (Echinochloa colona [L.] Link). Chopped crop residues were soil-incorporated alone and mixed at 6 g kg-1 soil (12 t ha-1) and compared with a control without residues. Soil incorporation of residues substantially delayed germination of jungle rice. The time to start germination, time to 50% emergence, mean emergence time, emergence index, and final germination percentage were all...
Tipo: Journal article Palavras-chave: Residues; Allelopathy; Sorghum; Sunflower; Brassica; Weed control.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300012
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Allelopathic research in Brazil Acta Botanica
Reigosa,Manuel; Gomes,Anabele Stefânia; Ferreira,Alfredo Gui; Borghetti,Fabian.
In this article, we review allelopathy studies conducted in Brazil or involving plant species that occur in the country. Conceptions and misconceptions associated with allelopathy, as well as some international criteria to be applied in allelopathic research, are presented and discussed. We observed a sharp increase in the number of papers on this subject conducted in Brazil between 1991 and 2010. However, most studies are conducted under laboratory conditions, lack a clear hypothesis or a solid justification, and typically make use of target species that do not co-exist with the donor species under natural conditions. We also found that most studies do not take the additional steps in order to purify and identify the bioactive molecules. We recommend that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allelopathy; Allelochemicals; Competition; Interference; Phytotoxicity; Weed control.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400001
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Alternaria alternata f. sp. sphenocleae, a potential mycoherbicide of gooseweed (Sphenoclea zeylanica Gaertner) International Rice Research Institute
Masangkay, Rhomela Favila.
xxi, 195 l. : ill. Thesis (Ph.D.) -- McGill University
Tipo: Thesis Palavras-chave: Rice; Weed control; Weeds; Biological control; Mycoherbicides; Alternaria alternata; Sphenocleaceae.
Ano: 1996 URL: http://hdl.handle.net/123456789/610
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Application of herbicides in corn Thai Agricultural
Somchart Kanjanajirawong; Maneesa Teerawatsakul.
1 table
Palavras-chave: Corn; Maize; Herbicides; Weed control; Atrazine; Alachlor; ข้าวโพด; การควบคุมวัชพืช; อาทราซีน; อะลาคลอร์.
Ano: 1976 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3857
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Applying search theory to determine the feasibility of eradicating an invasive population in natural environments AgEcon
Cacho, Oscar J.; Hester, Susan M.; Spring, Daniel.
The detectability of invasive organisms influences the feasibility of eradicating an infestation. Search theory offers a framework for defining and measuring detectability, taking account of searcher ability, biological factors and the search environment. In this paper, search theory concepts are incorporated into a population model, and the costs of search and control are calculated as functions of the amount of search effort (the decision variable). Simulations are performed on a set of weed scenarios in a natural environment, involving different combinations of plant longevity, seed longevity and plant fecundity. Results provide preliminary estimates of the cost and duration of eradication programs to assist in prioritising weeds for control. The...
Tipo: Article Palavras-chave: Bioeconomics; Invasive species; Operations research; Population dynamics; Weed control; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/118522
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Basic studies for weed control of cultural fields in cerrado. Infoteca-e
YAMAMOTO, H..
bitstream/item/178533/1/ID09932-CRI1786.pdf
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Planta daninha; Brasil; Japão; BIBJICACPAC.; Cerrado; Controle Cultural; Cooperação Internacional.; Pesquisa; Weed control.
Ano: 1981 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/552990
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Biological control of Echinochloa species with pathogenic fungi International Rice Research Institute
Zhang, Wenming.
xxii, 167 p. ill. Thesis (Ph.D.) -- McGill University
Tipo: Thesis Palavras-chave: Echinochloa; Biological control; Rice; Weed control; Plant pathogenic fungi.
Ano: 1996 URL: http://hdl.handle.net/123456789/595
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Comparative Efficacy of Different Weed Management Strategies in Wheat Chilean J. Agric. Res.
Ehsan Safdar,Muhammad; Asif,Muhammad; Ali,Amjed; Aziz,Ahsan; Yasin,Muhammad; Aziz,Mudassir; Afzal,Muhammad; Ali,Asghar.
Weed management programs should focus on environmental safety along with benefits to the farmer. We evaluated the effects of various weed control methods: ‘daab’ practice (stale seed bed technique), manual hoeing, and the chemical method (mixture of Buctril Super 60EC [bromoxynil + MCPA]0.45 kg ai ha-1 and Puma Super 75EW [fenoxaprop-P-ethyl] 0.75 kg ai ha-1) in combination with different planting geometries: 22.5 cm apart single row, 22.5 cm apart crisscross double row, 30 cm apart single row and broadcast sowings on weed control and grain yield of spring wheat (Triticum aestivum L.) var. Sehar 2006 at the University College of Agriculture, University of Sargodha, Pakistan, during the winters of 2009 and 2010. The chemical method, manual hoeing and ‘daab’...
Tipo: Journal article Palavras-chave: Weed control; Sowing pattern; ‘daab’ practice; Crisscross sowing; Yield components.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200003
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Comparison of response of legumes on previously atrazine treated soil with that of untreated and newly treated soils Thai Agricultural
Dad, Chaudhry Allah.
Palavras-chave: Legumes; Soybeans; Mungbeans; Atrazine; Herbicides; Soil treatment; Weed control; ข้าวโพด; อาทราซีน; พืชตระกูลถั่ว; การจัดการดิน.
Ano: 1971 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3781
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Conservation Agriculture in Trouble? Estimating the Economic Impact of an Eventual Glyphosate Prohibition in Spain Planta Daninha
PARDO,G.; MARTÍNEZ,Y..
ABSTRACT: Weed control is a crucial aspect in many conservation agriculture systems given that costs and time savings from avoiding tillage are closely linked to the use of effective and environmental friendly herbicides. This has led to the widespread use of glyphosate in farms, as it is a broad-spectrum, easily degradable, low- cost herbicide. The recent debate on the safety of glyphosate and on the excessive use of chemical herbicides in food production has caused concern on farmers about the possible economic effects of a virtual ban on glyphosate. The aim of this paper is to estimate the costs associated with an eventual prohibition of glyphosate in Spanish conservation agriculture areas. The costs of different alternative weed control strategies for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation systems; Conventional tillage; Economic evaluation; Weed control.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100166
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Control of ALS- and EPSPS-Resistant Amaranthus palmeri by Alternative Herbicides Applied in PRE- and POST-Emergence Planta Daninha
GONÇALVES NETTO,A.; NICOLAI,M.; CARVALHO,S.J.P.; MALARDO,M.R.; LÓPEZ-OVEJERO,R.F.; CHRISTOFFOLETI,P.J..
ABSTRACT: The emergence of resistant biotypes of the Amaranthus palmeri species in cotton production areas of the state of Mato Grosso, Brazil, generated the need for correct identification of this species and information on viable herbicidal tools for their management. Thus, greenhouse experiments were conducted to evaluate the efficacy of alternative herbicides applied to A. palmeri in pre and post emergence. A randomized block design with four replications was used. The efficacy of herbicides applied in pre emergence was evaluate in two experiments, one in a clayey and other in a sandy soil; 9 herbicide treatments (8 with herbicide application and a control without application) were applied on each soil. Subsequently, two experiments with different...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caruru; Weed control; Resistance; Phenology; Soil texture.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100193
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Control of purple nutsedge in corn plantings Thai Agricultural
Suwunnamek, U..
1 ill., 1 table
Palavras-chave: Corn; Maize; Purple nutsedge; Herbicides; Weed control; Yields; ข้าวโพด; แห้วหมู; สารกำจัดวัชพืช.
Ano: 1979 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3974
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Control of weedy rice by early submergence and variety choice : impact on competitive balance and yield loss International Rice Research Institute
de Ponti, Tomek.
38 p. : ill. Thesis (M.S.) -- Wageningen University
Tipo: Thesis Palavras-chave: Rice; Weed control; Submergence; Varieties; Crop-weed competition; Yields.
Ano: 2002 URL: http://hdl.handle.net/123456789/444
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Controle de plantas daninhas com herbicidas aplicados via herbigacao, na cultura do feijao, em plantios direto e convencional. Infoteca-e
FONTES, J. R. A.; SILVA, A. A. da; VIEIRA, R. F.; RAMOS, M. M..
bitstream/CPAC-2009/24717/1/doc_55.pdf
Tipo: Documentos (INFOTECA-E) Palavras-chave: Planta daninha; Zero tillage; Herbigation.; Controle Químico; Feijão; Herbicida; Phaseolus Vulgaris; Plantio Direto; Solo.; Herbicides; Beans; Chemical control; Conventional tillage; Fomesafen; Metolachlor; Soil; Weed control; Weeds..
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546461
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Controle de plantas daninhas na cultura da seringueira na microrregião Alto Purus- Acre. II. Em condições de seringal em formação. Infoteca-e
CASTRO, F. de A.; CAMPOS, I. S..
O controle eficiente e econômico de plantas daninhas é um dos principais fatores de alta produção em todas as culturas. Na cultura da seringueira, não será exagero afirmar que, em sua fase inicial é este o problema técnico mais difícil de resolver, muito especialmente na região Amazônica, onde as condições climáticas favorecem o desenvolvimento de uma flora infestante cuja composição é extraordinariamente variada, exigindo, por conseguinte, um maior número de capinas para manter o cultivo em boas condições de vegetação. Neste trabalho procurou-se estudar o efeito de diferentes doses de misturas de herbicidas, aplicados em pré e pós-emergência, objetivando maior eficiência no controle das plantas daninhas, na cultura da seringueira, nas condiç3es...
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Ruber tree; Alto Purus; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Hevea spp; Control de malezas.; Seringueira; Erva daninha; Defensivo; Herbicida; Caucho.; Herbicides.; Weed control.
Ano: 1979 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492289
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Controlled release formulations of herbicides based on micro-encapsulation Ciencia e Investigación Agraria
Sopeña,Fátima; Maqueda,Celia; Morillo,Esmeralda.
Annual worldwide losses to weeds are estimated to comprise approximately 10-15% of attainable production among principal food sources. Worldwide consumption of herbicides represents 47.5% of the 2 million tons of pesticide consumed each year. However, the heavy use of herbicides has given rise to serious environmental and public health problems. It is therefore important to develop new herbicide formulations that are highly effective, that are safer (for the worker and for the environment), and that involve a low cost/production ratio. In this sense, Controlled release formulations of herbicides have become necessary in recent years, since they often increase herbicide efficacy at reduced doses. The present work reviews in detall the components of various...
Tipo: Journal article Palavras-chave: Adjuvant; Contamination; Control; Delivery system; Formulations; Herbicide; Micro-encapsulation; Weed control.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100002
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Crop production and soil management practices for improving yield of corn Thai Agricultural
Owaht Jootanon; Supot Faungfupong; Rachain Thiraporn.
18 tables
Palavras-chave: Corn; Maize; Varieties; Plant population; Thinning; Weed control; Tassel removal; Leaf angle; Plant densities; Crop production; Soil management practices; ข้าวโพด; การผลิต; การจัดการดิน.
Ano: 1971 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3759
Registros recuperados: 101
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