Influência do molibdênio e do nitrogênio na produção de Brachiaria brizantha cv. Marandu

Abstract

Because of depletion of the soils in south-east Brazil, Brachiaria sp. has increased its importance among cattle farmers, since it can tolerate soils with low nutrient levels. The hypothesis of this study took into account that, since Mo is a co-factor of nitrate reductase activity affecting nitrogen metabolism, different concentrations of this micronutrient could support an increase in B. brizantha growth. Therefore, the objective of this study was to verify the effects of different concentrations of Mo on physiology and yield of Brachiaria brizantha cv. Marandu, and the interaction with different N concentrations in Presidente Prudente SP, Brazil. Under simulated graze in greenhouse conditions, percentage of gross protein, dry matter production, number of shoots, and nitrate reductase activity was evaluated. Our results didn t show an expected dose-response curve in relation to Mo concentrations. However, the results indicated that Mo supplies for B.brizantha should be carried out plus nitrogen supplementation.