dessecação pré-colheita de soja e brachiaria brizantha consorciadas com doses reduzidas de graminicida pre-harvest desiccation of soybean intercropped with brachiaria brizantha under reduced doses of graminicide

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ID: 176748
2006
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Ranked #53 of 193 articles by views in proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006

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Abstract
O objetivo deste trabalho foi avaliar os efeitos da dessecação pré-colheita de soja consorciada com Brachiaria brizantha cv. Marandu, com doses reduzidas de graminicida, na viabilização de colheita mecânica de soja e na capacidade de rebrota e formação de palha de B. brizantha. Foi utilizado esquema fatorial 5x3, com cinco doses do graminicida fluazifop-p-butil - 0, 15, 30, 45 e 60 g ha-1 - e três manejos de dessecação do consórcio - sem dessecação e com dessecação nos estádios R7 ou R8 da soja -, em delineamento de blocos casualizados, com quatro repetições. Foram avaliadas duas testemunhas, soja e B. brizantha em monocultivo, capinadas manualmente. A braquiária foi altamente suscetível à ação do graminicida. O consórcio entre soja e B. brizantha, submetido a 15 g ha-1 de graminicida e dessecado no estádio R7 da soja, permitiu a colheita mecânica da soja e a produção de grãos semelhante à alcançada no monocultivo, proporcionando acúmulo de matéria seca de B. brizantha de 4,6 t ha-1, 60 dias depois da colheita da soja. A B. brizantha consorciada com soja, sem aplicação de graminicida, acumulou 6 t ha-1 de matéria seca na colheita da soja e 9,3 t ha-1 60 dias depois da colheita da soja, e o acúmulo de matéria seca de B. brizantha em monocultivo, nessas duas épocas, foi de 13,3 e 21,6 t ha-1, respectivamente.
The objective of this work was to evaluate the effects of pre-harvest desiccation of soybean and Brachiaria brizantha cv. Marandu, treated with reduced doses of graminicide under intercropping system on soybean mechanical harvest as well as forage regrowth and straw yield. A 5x3 factorial scheme was used, consisting of five rates of fluazifop-p-butyl (0, 15, 30, 45 and 60 g ha-1) and three intercropping desiccation managements, without desiccation or desiccated at R7 or R8 soybean stage, in a randomized complete block, with four replications. Two control treatments were included; soybean and B. brizantha under monocrop kept clean by hand hoeing. B. brizantha was highly susceptible to herbicide. Soybean and B. brizantha intercropped at 15 g ha-1 of graminicide and desiccated at R7 soybean stage allowed soybean mechanical harvest and grain yield similar to those achieved under monocrop, providing dry mass accumulation of B. brizantha of 4.6 t ha-1, 60 days after soybean harvest. B. brizantha intercropped with soybean, without graminicide application, accumulated 6 t ha-1 of dry mass at soybean harvest and 9.3 t ha-1, 60 days after, with mass accumulation of B. brizantha under monocrop being 13.3 and 21.6 t ha-1, respectively.
Reference Key
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Authors ;Andréia Cristina da Silva;Francisco Cláudio Freitas;Lino Roberto Ferreira;Rogério Soares Freitas
Journal proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006
Year 2006
DOI
10.1590/S0100-204X2006000100006
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000100006
Keywords
glycine max manejo

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