ADUBAÇÃO N, P E K EM SORGO SILAGEM NA SAFRINHA, EM ARINOS - MG

Abstract

The present study aimed to evaluate the effects of nitrogen doses on morphological and productive attributes in the sorghum crop for silage, Nusil 426 variety. The experiment was installed in the 2020/21 crop in the municipality of Arinos - MG, in a Red Latosol. The experimental design wasstablished in randomized blocks, with four replications and five doses of N (0, 50, 100, 150 and 200 kg ha-1). Plant height (AP), stem diameter (DC), leaf area (AF), shoot dry mass productivity (PMS), grain dry mass (MSG), leaf nitrogen content (TN) were evaluated, nitrogen accumulation in shoot dry mass (AC) and nitrogen efficiency (EF). The data obtained were submitted to the SISVAR statistical software. And to the results obtained, regression analysis of variance was applied with a significance of P <0.05. Statistical analysis of data from DC, PMS, MSG, TN, AC and EF variablesshowed a significant effect for the linear model. On the other hand, the variables AP, AF and AC had no significant effect for any of the models tested. It is concluded that the doses of N applied did not determine the maximum point of the selected variables because they presented a linear result as a function of the vegetative development and for the production of sorghum silage in Arinos - MG, however, the development and production of sorghum silage were directly related to the application of N doses, when compared to the control.