Estabelecimento de normas DRIS para a diagnose nutricional Brachiaria brizantha cv. Marandú visando a produção de sementes

Abstract

Field two experiment were conduted with the aim of establishing DRIS norms for Brachiaria brizanha cv. marandú look at seeds production in the west of the state of São Paulo as an alternative for the nutritional diagnosis of plants. Experiment were conduted in the Modelo Farm of group Fachili,, in the districts of Santo Anastacio, locate in the coordinates UTM a 421.799 Easting e 7555.148 Northing, from November 2003 to October, 2004. The first experiment, answer under NPK in a factorial scheme 4 x3 x 4 being N (30, 130, 230 e 330 Kg N.ha-1), P (0, 75 e 150 Kg de P2O5.ha) e K (0, 100, 200 e 300 kg de K2O.ha-1), appliing urea, simple superphosphate and potássium chloride with nutrients font. The second experiment an test of this doses of Bore was the objective, being 0, 0,5 e 1 KgB.ha-1. The program of collect establishment, the die were subdivide different production (>200; 170-140; 140-110; 110-70; 70-50; < 50 kg seeds pure.ha-1). In the all, the die of bank contemplate 152 observation. The diagnosis by means of system DRIS in the experiment of this doses of bore indicated the diminution DRIS index Bore and the increase of production. The fertilization of potássium chloride generated the readuction DRIS index calcium e magnesium. At the NPK variation, the aplication of this elements when deficient increase the production