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NITROGEN SIDEDRESS ON SILAGE MAIZE INTERCROPPED WITH MARANDU GRASS
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ABSTRACT - The method used for the establishment of an intercropping system may interfere in the optimal timing of nitrogen sidedress fertilization on maize for silage. Due to this, the aim of this study was to evaluate the effects of nitrogen sidedress timing on the development and yield of silage maize and Marandu grass grown under irrigation in an intercropping. A split plot randomized blocks design with four replications was used. The plots corresponded to the nitrogen sidedress timing on silage maize (0, 15, 30, 45 and 60 days after sowing, corresponding to the phenological stages V3, V5, V7 and R1, respectively). The subplots consisted of two consortium establishment methods, Marandu Grass simultaneously sowed with the maize crop and 30 days after. The simultaneous sowing of silage maize and Marandu grass intercropped, and irrigated favors the grass development and dry mass yield, reducing the yield of maize ear green mass and maize total dry mass. The nitrogen fertilization after corn sowing reduced maize silage yield and favored the forage production of the intercropped Marandu grass.Keywords: Zea mays; Urochloa brizantha cv. Marandu; interspecific competition; integration crop-livestock.ADUBAÇÃO NITROGENADA DE COBERTURA PARA O MILHO SILAGEM CULTIVADO EM CONSÓRCIO COM CAPIM MARANDURESUMO - O método de introdução da forrageira no sistema de consórcio pode interferir no momento ideal para a realização da adubação nitrogenada em cobertura na cultura do milho silagem. Em função disto, objetivou-se avaliar os efeitos de diferentes épocas de adubação nitrogenada em cobertura no desenvolvimento e produtividade da cultura do milho silagem e do Capim Marandu, cultivados em consórcio sob irrigação. Utilizou-se delineamento experimental de blocos ao acaso em parcelas subdivididas, com quatro repetições. As parcelas corresponderam à época de adubação nitrogenada em cobertura no milho silagem (0, 15, 30, 45 e 60 dias após semeadura do milho, equivalendo à semeadura, V3, V5, V7 e R1, respectivamente). Nas subparcela, foram testados dois métodos de implantação do consórcio: Capim Marandu semeado simultaneamente à cultura do milho e 30 dias após. A semeadura simultânea do milho silagem e do Capim Marandu, em sistema de consórcio, favoreceu o desenvolvimento e a produção de massa seca do capim, reduzindo a produtividade de massa verde de espigas de milho e massa seca total de plantas. A adubação nitrogenada de cobertura realizada após a semeadura prejudicou a produção de milho silagem e beneficiou o desenvolvimento do capim Marandu cultivado em consórcio.Palavras-chave: Zea mays; Urochloa brizantha cv. Maradu; competição interespecífica; integração lavoura-pecuária.
Revista Brasileira de Milho e Sorgo
Title: NITROGEN SIDEDRESS ON SILAGE MAIZE INTERCROPPED WITH MARANDU GRASS
Description:
ABSTRACT - The method used for the establishment of an intercropping system may interfere in the optimal timing of nitrogen sidedress fertilization on maize for silage.
Due to this, the aim of this study was to evaluate the effects of nitrogen sidedress timing on the development and yield of silage maize and Marandu grass grown under irrigation in an intercropping.
A split plot randomized blocks design with four replications was used.
The plots corresponded to the nitrogen sidedress timing on silage maize (0, 15, 30, 45 and 60 days after sowing, corresponding to the phenological stages V3, V5, V7 and R1, respectively).
The subplots consisted of two consortium establishment methods, Marandu Grass simultaneously sowed with the maize crop and 30 days after.
The simultaneous sowing of silage maize and Marandu grass intercropped, and irrigated favors the grass development and dry mass yield, reducing the yield of maize ear green mass and maize total dry mass.
The nitrogen fertilization after corn sowing reduced maize silage yield and favored the forage production of the intercropped Marandu grass.
Keywords: Zea mays; Urochloa brizantha cv.
Marandu; interspecific competition; integration crop-livestock.
ADUBAÇÃO NITROGENADA DE COBERTURA PARA O MILHO SILAGEM CULTIVADO EM CONSÓRCIO COM CAPIM MARANDURESUMO - O método de introdução da forrageira no sistema de consórcio pode interferir no momento ideal para a realização da adubação nitrogenada em cobertura na cultura do milho silagem.
Em função disto, objetivou-se avaliar os efeitos de diferentes épocas de adubação nitrogenada em cobertura no desenvolvimento e produtividade da cultura do milho silagem e do Capim Marandu, cultivados em consórcio sob irrigação.
Utilizou-se delineamento experimental de blocos ao acaso em parcelas subdivididas, com quatro repetições.
As parcelas corresponderam à época de adubação nitrogenada em cobertura no milho silagem (0, 15, 30, 45 e 60 dias após semeadura do milho, equivalendo à semeadura, V3, V5, V7 e R1, respectivamente).
Nas subparcela, foram testados dois métodos de implantação do consórcio: Capim Marandu semeado simultaneamente à cultura do milho e 30 dias após.
A semeadura simultânea do milho silagem e do Capim Marandu, em sistema de consórcio, favoreceu o desenvolvimento e a produção de massa seca do capim, reduzindo a produtividade de massa verde de espigas de milho e massa seca total de plantas.
A adubação nitrogenada de cobertura realizada após a semeadura prejudicou a produção de milho silagem e beneficiou o desenvolvimento do capim Marandu cultivado em consórcio.
Palavras-chave: Zea mays; Urochloa brizantha cv.
Maradu; competição interespecífica; integração lavoura-pecuária.
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