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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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.
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 |
silva2006pesquisadessecao
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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
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