Eficiência agronômica de tecnologias de fertilizantes na adubação fosfatada

Abstract

The low availability of phosphorus in acidic soils, such as those in the Cerrado, requires efficient management of phosphate fertilizers. The use of technologies that increase the efficiency of phosphorus use is an alternative that can be adopted, as long as the reality of Brazilian soils is considered. Therefore, the objective of this work was to evaluate the fixation of phosphorus (P) in the soil with the application of different types of phosphate fertilizers and in different dosages. The experiment was conducted in a laboratory on the Umuarama campus of the Federal University of Uberlândia, in Uberlândia, Minas Gerais State, Brazil. The experimental design was completely randomized, in a 4x4 double factorial scheme, with 4 replications. The first factor consisted of 4 sources of phosphorus: 1 - organomineral fertilizer with an organic base on crumbled cellulose waste (05-26-00); 2 - organic-based organomineral fertilizer on granulated cellulose waste (05-26-00); 3 – mineral coated with polymer and 4 – mineral. The second factor corresponded to 4 doses of P2O5 (0, 200, 400 and 800 kg ha-1 of P2O5). The results showed that, independently of the extractor used, the available phosphorus was higher in the treatments with organomineral fertilizer and polymerized mineral compared to conventional mineral fertilizer. Consequently, with phosphorus more available in the soil solution, there was less phosphorus fixation when organomineral fertilizers and polymerized mineral were used, which demonstrate the physical and chemical protection provided by these fertilizers.