NITROGÊNIO E MOLIBDÊNIO PARA MILHO IRRIGADO EM REGIÃO DE CERRADO DE BAIXA ALTITUDE
DOI:
https://doi.org/10.18512/1980-6477/rbms.v15n3p418-427Keywords:
doses, micronutriente, plantio direto, Zea mays L.Abstract
RESUMO – A maior parte do nitrogênio (N) é absorvida pela cultura do milho na forma de nitrato (NO3 -), que é reduzido na planta pela ação da enzima nitrato redutase, a qual tem o molibdênio (Mo) como um dos principais constituintes. O objetivo deste trabalho foi avaliar doses de N em conjunto com Mo na cultura do milho irrigado, cultivado em sistema plantio direto. O experimento foi desenvolvido no município de Selvíria, MS. O delineamento utilizado foi o de blocos casualizados em parcelas subdivididas com quatro doses de N (0, 90, 135 e 180 kg ha-1) e cinco doses de Mo (0, 10, 20, 30 e 40 g ha-1), com quatro repetições. Foram avaliados atributos morfológicos e produtivos da cultura. A maior produtividade de milho foi obtida com 180 kg ha-1 de N e com 25,6 g ha-1 de Mo.
Palavras-chave: adubação nitrogenada, micronutriente, plantio direto, Zea mays L.
NITROGEN AND MOLYBDENUM FOR IRRIGATED MAIZE IN THE BRAZILIAN SAVANNAH WITH LOW ALTITUDE
ABSTRACT – Most of nitrogen (N) is absorbed by maize as nitrate (NO3 -), that is reduced in the plant by the action of the nitrate reductase enzyme, which has molybdenum (Mo) as a major component. The objective of this study was to test N rates together with Mo for irrigated corn grown in no-tillage system. The experiment was conducted at the Selviria county, Mato Grosso do Sul State. The design was a randomized complete block with split plots, with four nitrogen rates (0, 90, 135 and 180 kg ha-1) and five doses of Mo (0, 10, 20, 30 and 40 g ha-1), with four replications. Morphological and productive attributes of corn crop were evaluated. The highest yield was obtained with 180 kg ha-1 N and 25.6 g ha-1 Mo.
Keywords – nitrogen fertilization, micronutrient, no-tillage, Zea mays L.
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