Phosphorus Fraction in Soil Oxidic after Application of Traditional and Potential Phosphate Fertilizer.

PHOSPHORUS FRACTION IN SOIL OXIDIC AFTER APPLICATION OF TRADITIONAL AND POTENTIAL PHOSPHATE FERTILIZER

Leonardo Theodoro BŸll, Aline da Silva Sandim, Nat‡lia Rodrigues Ferreira Eloy, Chad Penn

Acidulated phosphate fertilizers fully are the main sources of phosphorus (P) in world agriculture. However, there are materials that currently are considered industry wastes which have phosphorus in their composition and therefore have the potential to be used as fertilizers. The objective was to integrate chemical methods to assess the dynamics of P and potential fertilizer phosphatic reaction products in typical Brazilian soils. In this work, the P fractions were evaluated in two textures of soil and maximum adsorption capacity of different P, a Oxisoil clayey and a sandy texture Quartzarenic fertilized with different reactivity of phosphates. The experiment was conducted in the in petri plates under temperature controlled 25 ¡ C and the soil remained incubated for 5 weeks. After this period each petri dish was sampled in the form of concentric rings, aiming at observing the match traversal provided in each fertilizer. Subsequently in each petri dish section was performed soil P fractionation according to the method described by Hedley et al. (1982), to assess how each reacted fertilizer in the soil and which are the fractions of P were provided by the same. It was found that FTS was fertilizer providing the highest match move on the ground, but only to the second section, distant 10 mm from the center section, probably due to the formation of labile compounds in other sources in general P remained in region where the bead was applied. The FP1 source was the alternative source that showed very similar behavior and even higher than the source of SFT reference, even as a fertilizer that has a lower solubility in water. He gave high levels of P in P total labile fraction and a fertilizer demonstrating the potential to be used.