Avaliação do manejo agroecológico do fósforo não lábil e sua influência sobre outros atributos do solo e na cultura do milho

Abstract

An important alternative to increase soil P availability and reduce the use of soluble phosphates in agriculture is the selection of bacteria and plants that solubilize non-labile forms of this element in tropical soils. The efficiency of the non-labile P solubility for corn was evaluated as a function of the presence / absence of Pseudomonas fluorescens, grown on different types of winter straw. The treatments were distributed in a completely randomized design in a factorial arrangement 2 x 5, that is to say, 2 forms of inoculation with Pseudomonas fluorescens (with and without) associated with 5 types of straw (without straw, vetch, lupine, crotalaria and forage turnip) , with 6 replicates, in a controlled environment. The development / growth of maize was influenced mainly by straw types, except for ear length, dry grain yield and P content in the grains, which responded significantly to the interaction between the types of straw and inoculation modes . Likewise, most soil chemical attributes were also influenced only by the types of straw, except for P-Mehlich1 and relative phosphorus content, which responded to the interaction of the factors tested, justifying the recommendation of fodder turnip in winter and inoculation with Pseudomonas fluorescens in maize seeds in order to increase soil P availability and maize crop. The adoption of this low cost management provided the recovery of non-labile soil P and reduced dependence on the use of soluble phosphate fertilizers in maize cultivation.