USO DA CROTALÁRIA NA EFICIÊNCIA DA ADUBAÇÃO NITROGENADA EM CULTIVARES DE CANA

Abstract

Brazil is a reference in the sugarcane production and management, today the state of Goiás is the second largest national producer of the culture. In this way, to increase crop productivity it is need to adopt cultivation practices and financial interest. The use of sunn hemp as an alternative source of nitrogen fertilization, prior to sugarcane cultivation, is a growing trend in the face of fertilizer increases. The objective of this work was to evaluate the effect of nitrogen cycling by sunn hemp in three varieties with different development cycles (IAC91-1099, RB985476 and RB975242) cultivated in two managements of fertililizing: with and without nitrogen (10-00-40 and 00-00-60), in Edéia, Goiás. The experiment was installed in a completely randomized design in a 3x2 factorial scheme, with 3 varieties and 2 fertilization managements. There was no interaction between the types of fertilization and varieties for tons of cane per hectare (TCH) at the level of 5% of significance, so the factors were analyzed individually. Regardless of N complementation, there were no increases in TCH using KCL or formulated. Planting with KCL promotes the same results, that is, the sunn hemp completely supplied the demand for nitrogen fertilizers. It was concluded that an efficient planting of sunn hemp can be effective for the N needs of the sugarcane crop.