Sistemas de preparo do solo e efeitos do tempo de nitrogênio no crescimento, manutenção da qualidade de grãos e verde no milho (Zea mays L.)
DOI:
https://doi.org/10.5433/1679-0359.2019v40n6Supl2p3007Palavras-chave:
Teor de clorofila, Razão Área foliar, Área foliar específica, Qualidade de grãos, Intervalos de aplicação de nitrogênio, Sistemas de manejo.Resumo
Nitrogênio (N), sendo móvel no solo, está exposto a várias perdas devido ao uso imprudente de fertilizantes nitrogenados e práticas convencionais de manejo do solo e das culturas, que podem ser minimizadas pela aplicação de nitrogênio temporal e diferentes práticas de preparo do solo. Este estudo foi realizado para elucidar o efeito de diferentes sistemas de preparo do solo e tempos de nitrogênio no crescimento, permanência e qualidade do grão verde no milho. Três sistemas de lavoura, viz. T1: preparo do solo com cultivador, T2: arado de aiveca + 2-cultivos, T3: escarificador + 2-cultivos; e cinco temporizações de azoto, viz. N1: todo na sementeira, N2: ½ na sementeira + ½ na V5 (fase de 5 folhas), N3: ½ na sementeira + ½ no pendoamento, N4: ½ na V5 + ½ na pompa, N5: 1/3 na sementeira + 1/3 em V5 + 1/3 no pendoamento). Sistemas de preparo do solo e aplicação de nitrogênio tiveram efeito significativo na área foliar por planta, área foliar específica e área foliar. Os sistemas de preparo do solo não tiveram efeito significativo na manutenção dos parâmetros de qualidade verde e de grãos, exceto para os teores de óleo. Entretanto, os tempos de nitrogênio tiveram efeito significativo sobre os teores de clorofila a, b e total, bem como parâmetros de qualidade de grãos. Os maiores teores de clorofila a, b e total foram observados com três fendas, isto é, 1/3 na semeadura + 1/3 em V5 + 1/3 no pendoamento comparado com outros tratamentos. Os resultados sugerem o cultivo do milho preparando o campo através do arado de cinzel e aplicando o N em três fendas para melhorar o seu crescimento, o teor de clorofila e a qualidade do grão.Downloads
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