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Alelopatia de cultivos de cobertura vegetal sobre plantas infestantes = Allelopathy of cover crop on weed plants

Keywords: plantas daninhas , rota o de culturas , interferência , controle cultural , weed plants , plants rotation , interference , plant control

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Abstract:

O presente trabalho avaliou o potencial alelopático de cultivos de cobertura vegetal de trigo, aveia preta, milheto, nabo forrageiro e colza sobre o desenvolvimento de plantas infestantes e verificou qual das coberturas vegetais exerce maior controle sobre as mesmas. Os cultivos de cobertura vegetal foram implantados sob preparo convencional (uma ara o e uma gradagem) no Núcleo Experimental de Engenharia Agrícola (NEEA), da Universidade Estadual do Oeste do Paraná (Unioeste), Cascavel, Estado do Paraná. Mensalmente, realizou-se o acompanhamento e identifica o das plantas infestantes emersas nas áreas de cobertura vegetal no período de agosto de 2000 a agosto de 2001. Os resultados obtidos permitiram concluir que das espécies encontradas, o capim marmelada foi o que apresentou maior potencial alelopático e a erva-de-santa-maria o menor. As coberturasvegetais que apresentaram melhor controle do total de plantas infestantes presentes na área experimental, incluindo àquelas com reconhecido potencial alelopático, foram aveia preta, colza, nabo forrageiro e milheto. This work evaluated the cover crop allelopathic potential of wheat, black oat, pearl millet, turnip and rape on the development of weed plants. It also verified which cover crop has larger control on the weed plants. The cover crop was implanted under conventional tillage (one disk plowing plus one disk harrowing) in the Experimental Nucleus of Agricultural Engineering (NEEA), of the State University of the West of Paraná (Unioeste), Cascavel, Paraná State. Monthly (from August 2000 to August 2001), weed plants identification in the cover crop area was made. Results showed that from the found species, the alexander grass was the one that presented larger allelopathic potential, and, the mexican-tea was the one that presented smaller control. The vegetable coverings that presented larger control of the total of weed plants in the experimental area, including those with recognized allelopathic potential, was black oat, rape, turnip and pearl millet.

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