Adensamento da beterraba no manejo de plantas daninhas
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Data
2008-03-01
Autores
Carvalho, L. B. [UNESP]
Guzzo, C. D.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
O objetivo deste trabalho foi verificar o efeito do adensamento da semeadura na capacidade de supressão da cultura da beterraba sobre a comunidade infestante. Os tratamentos constituíram-se de 12 períodos semanais crescentes de convivência e controle das plantas daninhas, a partir da segunda semana após a semeadura, submetidos a duas densidades populacionais da cultura (40 e 50 plantas m-2). Avaliou-se o acúmulo de massa seca pelas plantas daninhas em cada período e a estimativa da época e extensão dos períodos críticos de interferência das plantas daninhas em função da produtividade comercial da cultura. Observou-se menor acúmulo de massa seca pelas plantas daninhas quando a cultura foi adensada, sendo a diferença média no acúmulo de 17 e 30% para períodos de convivência e controle, respectivamente. O período crítico de prevenção à interferência foi menor na cultura adensada (11 dias) em relação à não-adensada (22 dias). O adensamento de semeadura da cultura da beterraba proporcionou aumento na capacidade de supressão da cultura sobre a comunidade infestante, afetando o crescimento e a época e extensão dos períodos críticos de interferência das plantas daninhas, podendo ser usado como ferramenta eficaz no manejo da flora invasora.
The aim of this research was to evaluate the effect of increased beet density on the capacity of beet plants to suppress weeds. The treatments were twelve weedy and weed-free increased periods submitted to two beet plant densities (40 and 50 plants m-2). Extension of weed interference was one week and time evaluation started in the second week after sowing. Weed dry mass accumulation for each period and estimate of time and extension of weed interference critical periods based on beet marketable yield were evaluated. Less weed dry mass accumulation was observed for increased beet density. The average percent difference of weed dry mass accumulation between densities was 17 and 30% under weedy and weed-free periods, respectively. The critical period of weed interference prevention was shorter for increased beet density (11 days) than for 40 plants m-2 beet density (22 days). Thus, increased beet density increased beet plant capacity to suppress weeds. Thus, weed growth and time and extension of weed interference critical periods were affected. Increased beet density can be used as an efficient tool for weed management.
The aim of this research was to evaluate the effect of increased beet density on the capacity of beet plants to suppress weeds. The treatments were twelve weedy and weed-free increased periods submitted to two beet plant densities (40 and 50 plants m-2). Extension of weed interference was one week and time evaluation started in the second week after sowing. Weed dry mass accumulation for each period and estimate of time and extension of weed interference critical periods based on beet marketable yield were evaluated. Less weed dry mass accumulation was observed for increased beet density. The average percent difference of weed dry mass accumulation between densities was 17 and 30% under weedy and weed-free periods, respectively. The critical period of weed interference prevention was shorter for increased beet density (11 days) than for 40 plants m-2 beet density (22 days). Thus, increased beet density increased beet plant capacity to suppress weeds. Thus, weed growth and time and extension of weed interference critical periods were affected. Increased beet density can be used as an efficient tool for weed management.
Descrição
Palavras-chave
Beta vulgaris, comunidade infestante, manejo cultural, Beta vulgaris, cultural management, weed community
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 26, n. 1, p. 73-82, 2008.