SUPERFICIAL FERTILIZATION WITH PHOSPHORUS AND POTASSIUM IN THE SOY CROP (GLYCINE MAX (L.) MERRILL ) AT DIFFERENT SOWING TIMES IN PRE SOWING UNDER A NO-TILLAGE SYSTEM INPLANTATION

Abstract

The experiment was carried out at the Capim Branco Farm, which belongs to the Federal University of Uberlândia, city of Uberlandia, Minas Gerais state, in the period from June 1999 through April 2002. It had as objective to evaluate the anticipated application of the fosfated and potassic fertilizer, the throwing, in presowing, under no-tillage, in the soy crop, cv. MG/BR-46 Conquista, during trhee cropping seasons. The used delineation was randomized blocks with five treatments (application times) and five replications. The fertilizations (100 kg.ha-1 of P2O5 and 100 kg. ha1 of K20) had been applied the throw, superficial, anticipated, carried through every year in the months of July, August, September, October and November (together with the sowing). The evaluated variables had been: productivity, ratio of P and K in the soil and leaves, first pod height in relation to the soil and weight of 100 seeds. The fertilization with match and potassium in the installation of the no-tillage system, the throwing, anticipated up to 5 months before the sowing also it does not influence statistically the soy grain production, the accumulation of P and K in the leaves, the weight of 100 seeds and the first pod height related to the soil. It was observed a significant increase for all the evaluated characteristics indicating P and K accumulation in the soil with the successive croppings.