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| Registros recuperados: 72 | |
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| 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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| KHAN,I.A.; KHAN,R.; HASSAN,G.; WAQAS,M.; SHAH,S.M.A.; KHAN,S.A.. |
| ABSTRACT: Three-year field studies were undertaken at Agricultural Research Institute, Dera Ismail Khan, Khyber Pakhtunkhwa Province, Pakistan from 2010-11 to 2012-2013 with the aim of assessing the efficacy of different management techniques on weed growth and yield of chickpea under rain-fed conditions on residual moisture of a previous rice crop. Treatments of the experiment consisted of recommended full and half doses of three herbicides, i.e., Stomp 330E, Dual Gold 960EC and Isoproturon 500EW and the plant extract of Parthenium hysterophorus. Hand weeding treatment was kept as positive control whereas weedy check was included as negative control treatment. The experiment was laid out in a Completely Randomized Block (CRB) design replicated thrice.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicides; Stomp 330E; Parthenium extract; Residual moisture; Weed control; Seed yield. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100339 |
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| Correia,Núbia Maria. |
| Abstract Background: Fleabane plants (Conyza spp.) resistant to glyphosate herbicide are found infesting areas in the Central-West and Southeast regions of Brazil, but its management is not a concerning problem for summer crops in these regions as in the South region of Brazil. Objective: To evaluate the management of adult fleabane plants at the summer soybean crop and off-season (autumn-winter), monitoring new emergences to assess the dynamics of plants from November 2018 to March 2020, and the residual effect of herbicides applied at the end of the rainy season in the Cerrado biome, in Brasília, DF, Brazil. Methods: Four field experiments were developed from November 06, 2018 to April 02, 2020; all under randomized block design, with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Conyza spp.; Residual herbicide; Weed control; Soybean. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100340 |
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| 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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| OBRADOR-OLÁN,J.J.; GARCÍA-LÓPEZ,E.; ALMEYDA-SANTOS,L.E.; CASTELÁN-ESTRADA,M.; CARRILLO-ÁVILA,E.. |
| ABSTRACT: Cover crops play an important role in sustainable agriculture, as they decrease soil erosion, promote the incorporation of nitrogen into the soil and reduce or modify weed communities. Aiming at evaluating the changes related to the cultivation and incorporation of sunn crotalaria (Crotalaria juncea L.1753) in a weed community of a soil cultivated with sugarcane, an agro-industrial crop of vital importance to La Chontalpa region, Tabasco, Mexico, an experiment encompassing the cultivation cycle and the incorporation of the dry phytomass of this cover crop was carried out. The treatments included three levels of fertilization and two controls, the plots of the first control were interspersed with those of the treatments, while the second control... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sunn crotalaria; Saccharum; Weed control; Cover crop. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100202 |
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| JAVAID,M.M.; ZIA,A.U.H.; WAHEED,H.; NARGIS,J.; SHAHID,A.; AZIZ,A.; WASAYA,A.. |
| ABSTRACT: Among various weed management strategies, chemical weed control is considered the most effective method. However, optimum dose and suitable combination of herbicide with adjuvants play a vital role in controlling weeds at an acceptable level and produce maximum crop yield. A field study was conducted to investigate the effect of post-emergence herbicide isoproturon alone or with combination of adjuvants on winter wheat and its associated weeds. The treatments were isoproturon at 175 g a.i. ha-1, 140 g a.i. ha-1 and 105 g a.i. ha-1 applied alone or with adjuvants Ad-500 or Bio-enhancer at 400 mL ha-1 each and weedy check as a control treatment. Isoproturon at 175 g a.i. ha-1 + Bio-enhancer at 400 mL ha-1 was most effective treatment for control of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fresh and dry weight; Gas exchange traits; Growth and yield; Herbicide doses; Triticum aestivum L.; Weed control. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100224 |
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| RAMÍREZ,J. G.; PLAZA,G.. |
| ABSTRACTThe weed communities of agricultural systems are dynamic and respond to changes in agronomic practices. This study aimed to evaluate the effect of post-emergence herbicide control programs made by farmers on weed communities and commercial lots of rice. The evaluations were carried out in 96 commercial lots located in the Centro, Meseta and Norte zones of the department of Tolima. In each lot, 1 ha was marked off, in which the evaluations were carried out by randomly throwing a 0.2 x 0.2 m sampling-square 5 times. Samples were taken before the first post-emergence application, after the first post-emergence application, after the second post-emergence application, and once the post-emergence applications were finished. The evaluated variables... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed control; Pendimethalin; Propanil; Bispyribac sodium. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000300499 |
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| SILVA,A.A.P.; OLIVEIRA NETO,A.M.; GUERRA,N.; HELVIG,E.O.; MACIEL,C.D.G.. |
| ABSTRACT One of the factors that can influence soybeans yield is the interference imposed by weeds. This research has aimed to determine the critical period of weed interference on cv. INT 6100 RRTM soybeans. The experiment was conducted under field conditions at Campo Mourão County, Parana State, in the 2013/2014 harvest, using randomized blocks, arranged in a 2 x 8 factorial, with four replications. In the first factor, the coexistence (period before weed interference) and control (total period of weed interference prevention) periods were assessed. The second factor consisted of management times of weed species (0, 7, 14, 28, 35, 49, 56 and 130 days after emergence - DAE). The evaluations performed were density and shoot dry matter of the weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coexistence; Weed control; Competition; Glycine max. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400707 |
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| Cacho, Oscar J.; Wise, Russell M.; Hester, Susan M.; Sinden, Jack A.. |
| When a weed invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. Ideally, these decisions should be based on a complete benefit-cost analysis, but this is often not possible. A partial analysis, combining knowledge of the rate of spread, seedbank longevity and economic-analysis techniques, can assist in making the best decision. This paper presents a model to decide when immediate eradication of a weed should be attempted, or whether weed control should be attempted at all. The technique is based on identifying two 'switching points': the invasion size at which it is no longer optimal to attempt eradication, and the invasion size at which it becomes optimal not to apply any form of control. It... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Invasive species; Eradication; Containment; Economics; Weed control; Switching point; Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/12908 |
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| 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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| 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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| Coelho,Maria Eliani Holanda; Freitas,Francisco Cláudio Lopes de; Cunha,Jorge Luiz Xavier Lins; Medeiros,José Francismar de; Silva,Márcio Gledson Oliveira da. |
| This study aimed to evaluate the effect of no-tillage and conventional planting systems, and of weed-management strategies on water-usage efficiency in capsicum crops. The experiment was carried out at the Universidade Federal Rural do Semi-Árido in Mossoró, Rio Grande do Norte, using a split-plot layout in a randomized block design with four replications. The tillage systems were evaluated in the plots, and three weed-management strategies evaluated in the subplots (soil cover with polyethylene film, and with and without weeds). The density and dry mass of the weeds, the commercial and total productivity, and the daily water consumption were all evaluated. It was found that the no-tillage system reduced the density and dry mass of the weeds in comparison... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chili; Plant and water; Mulch; Weed control. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400010 |
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| Guareschi,André; Cechin,Joanei; Bianchi,Mario Antonio; Maldaner,Ivan Carlos; Machado,Sergio Luiz de Oliveira. |
| ABSTRACT: Italian ryegrass (Lolium multiflorum Lam.) is a troublesome weed widely found in temperate Brazilian fields with several herbicide-resistant populations. Soil seed bank is the main source of future infestations and can be strongly affected by agricultural practices, such as crop rotation and tillage system. Therefore, this study evaluated the long-term effects of different crop rotation and tillage systems on the seed bank of Italian ryegrass. Data were collected in 2012 and 2013 in a field managed since 1985 under conventional-tillage and no-tillage and subjected to three cropping systems (monoculture, total, and partial rotation) compared to the control plot. The samples were collected at three soil depths (0-5, 5-10, and 10-20 cm) using a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum Lam.; Dynamic population; Cultural methods; Mechanical practices; Weed control. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500601 |
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| Melo,Alessandra Morais; Reis,Cristiano Rodrigues; Martins,Bruno Ferraz; Penido,Tamires Mousslech Andrade; Rodriguez,Luiz Carlos Estraviz; Gorgens,Eric Bastos. |
| ABSTRACT In eucalyptus plantations, the presence of understory increases the risk of fires, acts as an obstacle to forest operations, and leads to yield losses due to competition. The objective of this study was to develop an approach to discriminate the presence or absence of understory in eucalyptus plantations based on airborne laser scanning surveys. The bimodal canopy height profile was modeled by two Weibull density functions: one to model the canopy, and other to model the understory. The parameters used as predictor in the logistic model successfully discriminated the presence or absence of understory. The logistic model composed by ℽ canopy, ℽ understory, and ℽ understory showed higher values of accuracy (0.96) and kappa (0.92), which means an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: LiDAR; Remote sensing; Weed control; Understory vegetation. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101001 |
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| Registros recuperados: 72 | |
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