EFFECT OF NATURAL PHOSPHATE, HIPERPHOSPHATE AND TRIPLE SUPERPHOSPHATE USING LED AGRONOMY UNIT, OXISOL IN THE PRODUCTION OF Glycine max (L) Merril (SOYBEAN)

Abstract

The hiperphosphate was used with efficiency in soils under vegetation of savana “cerrado” but due to the difficulties on its import, it has been substituted by other products, among them the hiperfosfago, tested in experiment realized by the authors of this work. The sources of P compared were: natural phosphate thinner crushed (FN), hiperfosfago (H), hiperfosfago (HM) having fertilization of maintenance same own hiperfosfago, and the triple superphosphate (ST) used in band seeded as fertilization in three different treatments, had not been used in one of the treatments with hiperfosfago (HM). The soil was a LED Agronomy, Unit, oxisol, that showed for the depth of “O” to l7cm and 17 to 34cm, the following values: pH = 5.1 and 4.8;Ca++ = 2.4 and 2.0 me./ 100 ml; P = 0.6 and 0.3 ppm; K =49 and 39 ppm and ";O"; me./100 ml of Al++³ permutable. The doses used were: “O”, 200, 400 and 600 kg of P2O5 by hectare. Soybean planted showed response for the different doses of phosphorus, although for the natural phosphate had not been significant. The different sources of P showed increase percentual of producfion over respective witnnes: FN = 20.06%, H = 40.6%; Hm = 123.2% and ST = 43.2%.