Nutritional Status and Soybean Productivity in Succession to Corn with Doses of Nitrogen and Molybdenum.

For the corn and soybean crops can express all their productive potential, they must be offered to them adequate conditions for normal development, in this sense, nitrogen is the nutrient that most limits the productivity of both. However, the fertilization with micronutrients is also needed for plant nutrition, including molybdenum, mainly soybeans crops. In this sense, the objective of this study was to evaluate the nutritional status and productivity of the soybean crop in succession corn in the second crop with nitrogen and molybdenum doses. The experiment was conducted at the Experimental area of UNESP – Ilha Solteira Campus, located in Selviria county, Mato Grosso do Sul State, Brazil. The first experiment with corn in experimental design was a randomized block design with split plot design, with four nitrogen rates (0, 90, 135 and 180 kg ha^-1) in the plot, having the urea as N source, and five doses of molybdenum (0, 10, 20, 30 and 40 g ha^-1) in the sub-plots. The crop was sown on 05/25/2013, in spaced 0.90 m. The second experiment was conducted with soybean in the summer crop on the same plots of the previous experiment. The crop was sown on of 11/13/2013, in spacing of 0.45 m. Soybeans were conducted without molybdenum and nitrogen application to evaluate the residual effect of the treatments used in the corn experiment. We evaluated the nutritional status of plants (leaf concentrations of N, P, K, Ca, Mg and S) and morphological components for soybeans (plant height, number of pods per plant, thousand grain weight and grain yield). Soybean yield and the leaf N content increases linearly as a function of residual nitrogen doses and there was a quadratic behavior with respect to the residual Mo doses and soybean yield, with a maximum point of 28.14 g Mo ha^-1.