AVALIAÇÃO DE FONTES DE ENXOFRE E DAS FORMAS DE MICRONUTRIENTES REVESTINDO O NPK NA CULTURA DO MILHO
DOI:
https://doi.org/10.18512/1980-6477/rbms.v15n1p20-29Keywords:
zea mays, fertilizantes, enxofre elementar, boro, zincoAbstract
RESUMO - No Brasil, com o uso constante de adubos concentrados em NPK com baixos teores de enxofre, além de outros fatores, o Enxofre (S) passou a ser limitante ao desenvolvimento das plantas. Com o objetivo de avaliar a eficiência agronômica de fertilizantes na cultura do milho associados a duas fontes de enxofre e a duas formas de micro-nutrientes, foram conduzidos dois experimentos sob plantio direto em novembro 2008. Um experimento foi semeado em Ijaci, MG e o outro em Lavras, MG. Os delineamentos experimentais foram de blocos casualizados com quatro repetições em esquema fatorial 3 x 2, sendo três fertilizantes, um sem enxofre e os outros dois com diferentes fontes de enxofre (enxofre elementar ou sulfato de amônio), associados a duas formas de micronutrientes (granulado ou grânulo revestido). Não foram constatadas diferenças para fontes de enxofre e para formas de fornecimento dos micronutrien-tes. As diferentes fontes de enxofre afetaram as características estudadas de modo semelhante e independeram da forma usada dos micronutrientes. A substituição do enxofre proveniente do sulfato de amônio pelo enxofre elementar em fertilizantes NPK ou até mesmo a ausência deste nos fertilizantes não comprometeu a eficiência dos fertilizantes avaliados pela produtividade.
Palavra-chave: Zea mays, enxofre elementar, sulfato de amônio.
EVALUATION OF SULFUR SOURCES AND FORMS OF MICRONUTRIENTS COATED ONTO NPK FERTILIZER IN MAIZE
ABSTRACT- In Brazil, as a result of the constant use of concentrated NPK fertilizers, besides some other factors, sulfur became a limiting nutrient for plant development. Two experiments were performed under no till system in November 2008 aiming to evaluate the agronomic efficiency of fertilizers associated to two sulfur sources and two micronutrients forms in corn crops,. one in Ijaci-MG and one in Lavras-MG. The experimental design was randomized blocks with four replications in a 3 x 2 factorial scheme, with three fertilizers, one without sulfur and the other two with different sources of sulfur (elemental sulfur or ammonium sulfate), associated to two forms of micronutrients (granular or coated granule). No differences were observed for sulfur sources and forms of supplying micronutrients. The different sulfur sources affected the characteristics in a similar way and did not depend on the form of the micronutrients. The replacement of sulfur originated from ammonium sulfate by the elemental sulfur in NPK fertilizers or even the absence of this in fertilizers did not affect the efficiency of fertilizer evaluated by productivity.
Keys words: Zea mays, elemental sulfur, ammonium sulfate.
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