Teores de proteína em leguminosas sob doses de molibdênio

Abstract

The greater productivity in legumes are associated to absorption of N in the soil-plant-atmosphere system, being this the principal macronutrient responsible of greater pro-ductions. The absorption of N has values potentialized with the application of Mo, where the micronutrient is a component of enzymes which catalyze diverse reactions that result in a higher N absorption. The Mo acts directly on the activity of nitrogenase and nitrate reductase, acting on the atmospheric N breaking and the absorption of N in the form of NO3 increasing the protein contents in the legumes in their shoot and in the stage of grain filling. In this way, the present work had as objective to evaluate the effect of application of Mo doses in green manure species Crotalaria juncea and Ca-navalia ensiformis in the assimilation of N through protein production. Were evaluated the concentrations of protein contained in the leaves of the species, through the method of Bradford. The experiment was carried out in the laboratory, where were evaluated samples of two species of green manure submitted to four doses of Mo (0, 40, 80, 120 g ha-1) in triplicate. ANOVA was performed, followed by regression analy-sis. Interaction between green manure species and Mo doses was observed. No ad-justment of regression models was observed for sunn hemp green manure as regards of protein content. Jack beans presented a quadratic response to the application of Mo in protein synthesis, with a maximum point of 52.31 g ha-1 of Mo (9.78 mg g-1 of protein). There was an increase in the protein content in the jack beans species under doses of Mo, however, an excess toxicity effect of the micronutrient could have occurred at the highest dose applied.