Aplicação foliar de molibdênio e cobalto na cultura da soja : rendimento e qualidade de sementes

Abstract

This study aimed to evaluate the effect of molybdenum and cobalt different doses applied by foliar fertilization in the soybean crop, aiming at increasing the yield components and physiological seed quality. The essay was carried out at Sucupira farm, city of Sorriso, in Mato Grosso State. The experimental design was a randomized block with four replications and six treatments with different doses. Product used in the application was the Nectar (cobalt and molybdenum) of Microquímica Company, applied with a backpack sprayer at a flow rate of 160 L.ha-1. Spraying occurred in the V5 growth soybean stage. Six treatments were conducted (0, 100, 200, 300, 400 and 500 commercial product mL.ha-1). It was analyzed the yield components (thousand seed weight, grain yield, number of pods per plant and number of seeds per pod) Physiologic seed quality (first count of germination, standard germination test, accelerated aging, field seedlings emergence and tetrazolium test) and health test (fungi and bacteria). Foliar spraying of cobalt and molybdenum up to 240 mL.ha-1 influences positively the number of seeds per pod culture, there was no significant increase in soybean yield. The doses of molybdenum and cobalt has a positive effect on physiological quality.