Determinação dos períodos de interferência de plantas daninhas na cultura do girassol
Carregando...
Data
2012-03-01
Autores
Silva, J.I.C.
Martins, D. [UNESP]
Pereira, M.R.R. [UNESP]
Rodrigues-Costa, A.C.P.
Costa, N.V
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
O objetivo deste estudo foi determinar o período anterior à interferência e o período total de prevenção à interferência da comunidade infestante sobre a cultura do girassol (híbrido M 734). O delineamento experimental utilizado foi o de blocos casualizados, com quatro repetições. Os tratamentos foram compostos por parcelas constituídas por períodos de controle e de presença de plantas daninhas. Para os períodos de controle, o girassol foi mantido livre das plantas daninhas pelos períodos crescentes de 7, 14, 21, 28, 35, 42, 49 e 125 dias após a sua emergência (DAE). Quanto a convivência, a cultura foi mantida na presença da comunidade infestante pelos mesmos períodos. Foram avaliados a densidade e o peso da matéria seca das plantas daninhas e, no girassol, a altura de plantas, o diâmetro de capítulos e a produtividade de aquênios e de óleo. Para a produtividade de aquênios, o período anterior à interferência foi de 15 DAE da cultura, e o período total de prevenção à interferência, de 39 DAE. O período crítico de prevenção à interferência abrangeu 24 dias do ciclo da cultura. Quanto à produtividade de óleo, o período anterior à interferência foi de 32 DAE, e o período total de prevenção à interferência, de 28 DAE.
The aim of this study was to determine the period prior to interference and the total period of prevention against interference of weeds in sunflower (hybrid M 734). The experiment was arranged in a complete randomized block design, with four replications. The treatments consisted of plots constituted by periods of control and presence of weeds. For the control periods, the sunflower plants were kept wedd free during increasing periods of 7, 14, 21, 28, 35, 42, 49 and 125 days after emergence (DAE). During cohabitation, the sunflower culture was maintained in the presence of the weed community during the same periods. Total density and dry weight of the weeds and plant height, chapter diameter, seed yield and oil of the sunflower plants were evaluated. For seed yield, the period before interference was 15 DAE of the culture, and the total period of prevention against weed interference was 39 DAE. The critical period of weed interference covered 24 days of the sunflower cycle. As for oil yield, the period before interference was 32 DAE, while the total period of prevention against weed interference was 28 DAE.
The aim of this study was to determine the period prior to interference and the total period of prevention against interference of weeds in sunflower (hybrid M 734). The experiment was arranged in a complete randomized block design, with four replications. The treatments consisted of plots constituted by periods of control and presence of weeds. For the control periods, the sunflower plants were kept wedd free during increasing periods of 7, 14, 21, 28, 35, 42, 49 and 125 days after emergence (DAE). During cohabitation, the sunflower culture was maintained in the presence of the weed community during the same periods. Total density and dry weight of the weeds and plant height, chapter diameter, seed yield and oil of the sunflower plants were evaluated. For seed yield, the period before interference was 15 DAE of the culture, and the total period of prevention against weed interference was 39 DAE. The critical period of weed interference covered 24 days of the sunflower cycle. As for oil yield, the period before interference was 32 DAE, while the total period of prevention against weed interference was 28 DAE.
Descrição
Palavras-chave
matocompetição, Helianthus annuus, plantas infestantes, weed competition, Helianthus annuus, weeds
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 30, n. 1, p. 27-36, 2012.