Absorção de NPK na cultura do inhame (Dioscorea cayennesis Lam) em três densidades de plantio

Abstract

It was analyzed the tenors of NPK on the parts of yam, grow it “Boca Funda” and its production in the different densities of planting. The experiment was installed on a small country in São José, São Félix – Bahia, between March and December 2007, on Solodic Euforic Planosol, the driving of the plants was in tutorial system with espalier. The treatments were arranged in design blocks (DBC), with five repetitions. The experimental plot was by 63m2 and were analyzed three spacing between planting (30; 40 and 50cm) it was kept the space of 1,20cm between lines. The evaluations were made in the middle of 90 to 210 days and the plantation 240 days. The most demand of NPK was in the middle of 90 and 130 days after the planting. After analyze tuber production in function of tenor of nitrogen it was evident that between treatments exist an opposite relation, in other words, as much as it increases the space, it also increases the concentration of nitrogen, which is following occurs a reduction of production, yet, to the phosphorus match and potassium the biggest tenors of were observed on a space of 40cm which corresponds to the treatment that it was conferred more production. To the parameter of total evaluation it was effectuated the plantation when the air part of the plants was in advanced state of senescence, this way, it was observed that the trade production was less with the reduction of planting density. Been that the space of 40cm between plants reached out the most productivity with 19,15 t ha -1. in relation to accumulation of dry raw to 240 days, it was observed that the plants behaviorism coincided as the same space that it had been found to the productivity, yet, the space of 40cm between plants presented, numerically, the biggest quantity of dry raw, following the same tendency gotten to the productivity of tubers.