APLICAÇÃO CONJUNTA DE MICRONUTRIENTE (Mn) E FUNGICIDA EM CULTIVO DE SOJA

Objetivou-se com o presente estudo avaliar os efeitos da aplicacao de manganes misturado ao fungicida, em plantas de soja. O experimento foi realizado na fazenda Beija-flor, municipio de Jaciara, estado de Mato Grosso. O delineamento utilizado foi o de blocos casualizados em esquema fatorial com parcela adicional (3x2+1) e quatro repeticoes. Foram aplicadas tres doses de manganes (50, 100 e 150 g ha-1), com duas caldas de aplicacao (manganes e manganes + fungicida), quando as plantas encontravam-se em estadio vegetativo e apresentavam 9 trifolios completamente desenvolvidos (v10). Na parcela adicional (controle) foi aplicado apenas fungicida, tambem no estadio fenologico v10. As caracteristicas avaliadas foram altura de plantas, massa de mil graos, produtividade e teor de manganes foliar. Nao ocorreram interacoes significativas entre os fatores avaliados. A produtividade nao foi alterada pelas misturas realizadas, porem, apresentou diferencas significativas em funcao das doses de manganes, sendo a melhor dose equivalente a 100 g ha-1. A parcela adicional diferiu estatisticamente dos tratamentos que receberam as doses de 50 e 150 g ha-1 (sem fungicida) para a variavel massa de mil graos, e do tratamento que recebeu a dose de 100 g ha-1 de manganes misturado ao fungicida, para a produtividade de graos. Conclui-se que a aplicacao de manganes em mistura com fungicida nao influenciou nas caracteristicas agronomicas das plantas de soja avaliadas, apresentando-se como uma alternativa para diminuicao de custos operacionais de aplicacao em cultivos comerciais.Palavra-chave: Glycine max (L.) Merrill, antagonismo, produtividade, sinergismo. COMBINING MICRONUTRIENT (MN) AND FUNGICIDE APPLICATIONS IN SOY BEAN PRODUCTIVE SYSTEMS ABSTRACT: The objective of this study was to evaluate the effects of the application of manganese together with fungicide in soybean plants. The experiment was carried on Beija-flor farm, in municipality of Jaciara, Mato Grosso state. The experimental design used was randomized block design in a factorial arrangement with an additional plot (3x2+1) and four replications.  Three manganese doses were applied (50, 100 and 150 g ha-1), with two application mixtures (manganese and manganese + fungicide), at vegetative stage, when the plants had 9 leafs (v10). On the aditional plot (control) only fungicide was applied, also phenological stage v10. The plant height, the mass of a thousand grains, the manganese content in the leaf and the yield, were the variables used to evaluate the effect of the applications. There were no significant interactions between the evaluated factors. Productivity was not altered by different mixtures, but there were found significant differences due to manganese doses. The best dose observed was the equivalent to 100 g ha-1 of manganese. The additional plot differed statistically from the treatments that received doses of 50 and 150 g ha-1 (without manganese) for the mass of thousand grains, and the treatment that received the dose of 100 g ha-1 manganese mixed with fungicide for grain yield. According to these results, the application of manganese and fungicides combined, do not influence the agronomic characteristics of soybean plants evaluated, that way is a valid alternative to reduce operating costs in soy bean production systems.Keywords: Glycine max (L.) Merrill, antagonism, productivity, synergism.