Manejo químico deChemical management of Digitaria insularis in the no-tillage system area AB S TR ACTThe objective of this study was to evaluate the chemical control of Digitaria insularis adult plants in the period of autumn-winter, in an area of no-tillage system. Two experiments were carried out using randomized blocks experimental design, in a 4x3 factorial, with four replications. The experiment was developed, under field conditions. In the first experiment the studied treatments were: four doses (0, 0.72; 1.44 and 2.16 kg ha -1 of acid equivalent) of glyphosate and three (0, 30 and 60 g ha -1 ) of haloxyfop -methyl. In the second experiment, the treatments were: four doses (0, 0.72; 1.44 and 2.16 kg ha -1 of acid equivalent) of glyphosate and three (0, 184 and 368 g ha-1), of sethoxydim. The results showed that the control of Digitaria insularis was unsatisfactory for all combinations of glyphosate, don't reaching 50% of efficiency. The addition of methyl haloxyfop or sethoxydim to glyphosate did not contribute to the control of the weed. In larger doses of glyphosate, there was synergistic effect of the mixture with sethoxydim.
O glyphosate possui amplo espectro de ação de plantas daninhas, porém, o uso exclusivo deste herbicida, em áreas de soja geneticamente modificada (transgênica), pode apresentar limitações. Algumas ABSTRACT RESUMOespécies podem requerer doses mais elevadas de glyphosate, aplicação sequencial ou, ainda, a adição de outro herbicida, para controle adequado (Ateh & harvey 1999). Além disto, o uso contínuo de herbicidas com o mesmo mecanismo de ação pode aumentar a pressão de seleção de biótipos de plantas daninhas 1. Trabalho recebido em fev./2010 e aceito para publicação em jun./2011 (n° registro: PAT 8807/
Dessecação de Crotalaria juncea no outono RESUMOObjetivou-se com este trabalho avaliar a ação do glyphosate em aplicação isolada e em misturas com 2,4-D ou metsulfuron methyl, na dessecação de plantas adultas de Crotalaria juncea no outono, em área de plantio. Foram instalados dois experimentos, sendo utilizado o delineamento experimental em blocos ao acaso, num esquema fatorial 4 x 3, com quatro repetições. Os tratamentos estudados no primeiro ensaio foram: quatro doses (0,00; 0,54; 1,08 e 1,62 kg ha -1 ) de glyphosate, associadas a três (0,00; 0,806 e 1,209 kg ha -1 ) de 2,4-D. No segundo ensaio foram estudadas as mesmas doses do glyphosate, associadas a três (0,0; 4,0 e 8,0 g ha -1 ) de metsulfuron-methyl. Foram realizadas avaliações visuais de fitointoxicação, contagem do número de plantas com rebrota e matéria seca de plantas. Concluiu-se que o glyphosate, em aplicação isolada ou em associações com o 2,4-D ou metsulfuron-methyl, independentemente das doses utilizadas, foi ineficaz na dessecação de plantas adultas de Crotalaria juncea. Palavras-chave:Adubo verde, controle de plantas daninhas, herbicida. Desiccation of Crotalaria juncea in the autumn season ABSTRACTThe objective of this study was to evaluate the effect of glyphosate applied alone and in mixtures with 2.4-D or metsulfuron methyl in the desiccation of mature plants of Crotalaria juncea during the fall season, in a field crop. Two experiments were carried out using a randomized experimental block design, in a 4 x 3 factorial scheme, with four replications. Treatments in the first experiment were formed by four doses (0.00, 0.54, 1.08 and 1.62 kg ha -1 ) of glyphosate, associated with three doses (0.00, 0.806 and 1.209 kg ha -1 ) of 2 ,4-D. In the second experiment the same doses of glyphosate were studied associated with three doses (0.0 4.0 and 8.0 g ha -1 ) of metsulfuron-methyl. Visual evaluations of plant poisoning, score number of plants with regrowth and dry matter of plants were determined. It was concluded that glyphosate applied alone or in association with 2.4-D or metsulfuron-methyl, regardless of the applied doses, was ineffective in the desiccation of mature plants of Crotalaria juncea.
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