Rendimento, teor de proteínas nas sementes e características agronômicas das plantas de soja em resposta à adubação foliar e ao tratamento de sementes com molibdênio e cobalto

Abstract

The molybdenum and cobalt are essential to nitrogen simbiotic fixation in leguminous and to other physiologic processes in superior plants. Micronutrients application to solve nutritional deficiency can be done through foliar fertilization, seed treatment or directly in the soil, together with conventional fertilization. In this context, an experiment was carried out to evaluate grain yield, protein content of seeds and agronomic traits of soybean plants after foliar fertilization and seed treatment with molybdenum (Mo) and cobalt (Co). For this, a BRS 133 cultivar was submitted to different treatments, consisting in a combination of seed treatment with and without Mo and Co (Comol) and foliar fertilization in different stages of developtment with the following commercial products: Comol (V 4 ), Bas-Citrus (V 4 ), Bas-Citrus + Fetrilon (V 4 ), Bas-Citrus + Fetrilon (R 4 ). There was also a control without fertilization. The characteristics evaluated were: grain yield, protein content of seeds, number of days for maturation, plant density, plant height, degree of the plants layering and height of the first pods insertion. The molybdenum and cobalt seed treatment and the foliar fertilization with Comol (Co + Mo) in V 4 stage of development promoted significant increases in grain yield. The seed treatment with Mo and Co increased the protein content of soybean seeds. The foliar fertilization with Bas-Citrus + Fetrilon in V 4 stage of development increased the plants height and the degree of plants layering. The molybdenum and cobalt seed treatment and foliar fertilization of soybean had no effects on the rest of plant agronomic traits evaluated.