Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/88500
Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 21-Jun-1999
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: TUESCA, D.
PURICELLI, E.
NISENSOHN, L.
FACCINI, D.
PAPA, J.
Título: Decision criteria for optimizing postemergence Johnsongrass control in soybean crops in Argentina.
Edição: 1999
Fonte/Imprenta: Pesquisa Agropecuaria Brasileira, Brasilia, v.34, n 5, p.749-53, maio 1999.
Idioma: en
Palavras-chave: Herbicide
Planta daninha
Herbicidas.
Conteúdo: Field studies were established in Zavalla and Oliveros, Argentina, during four years in order to optimize Johnsongrass (Sorghum halepense (L.) Pers.) chemical control by means of the thermal calendar model in comparison with other criteria (weed height or days after sowing). The effect of three application dates of postemergence herbicides was determined by visual control, density of tillers originated form rhizome bud regrowth, and from crown and shoot bud regrowth, and soybean yield. Following the thermal calendar model criterion, applications during the second date afforded the best control. Weed height for the first date showed little variability between experiments but was highly variable in the second and third application dates, achieving in some cases values greater than 120 cm. For all years, no significant differences were detected for crop yield between the first and second application dates, and yields were always lower for the third date. The greatest rhizome bud regrowth was observed for the earliest application date and the highest crown and shoot bud regrowth was determined for the last application date. Parameters associated with control efficiency showed the best behaviour for the second date. However, plant height at this moment may interfere with herbicide application and variability exhibited by this parameter highlights the risk of determining control timing using only one decision criterion.
Thesagro: Época de Aplicação.
NAL Thesaurus: application timing
weeds.
Ano de Publicação: 1999
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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