Crop growth response and dynamics of inorganic phosphorus fractions after application of reactive Arad phosphate rock in Oxisol with different land use histories

• Main Author: Lacerda, Julian Junio de Jesus
• Publication Date: 2013
• Other Authors: Furtini Neto, Antonio Eduardo, Resende, Alvaro Vilela de, Santos, Jose Zilton Lopes dos, Carneiro, Leandro Flavio, Oliveira, Cesar Henrique Caputo de
• Format: Article
• Language: eng
• Source: Repositório Institucional da UFLA
• Download full: http://repositorio.ufla.br/jspui/handle/1/12560
• topic: Soils – State of Goiás, Brazil – Cerrado; Plants – Effect of phosphorus; Phosphorus fertilization; Phosphorus fractionation; Solos – Goiás (Estado) – Cerrado; Plantas – Efeito do fósforo; Adubação fosfatada; Fracionamento de fósforo

Adsorbed or precipitated phosphorus can be susceptible to dissolution depending upon environmental conditions. This work evaluated both the partitioning and availability of the inorganic forms of P bound to Al, Fe and Ca in samples of a clayey Dystrophic Red Latosol (Oxisol) (DRL) with different land use history, fertilized with Arad reactive natural phosphate in Goias State, Brazil. The inorganic fractions of Al-P, Fe-P and Ca-P and the contents of Mehlich-1, ion-exchange resin, citric acid and Olsen extracted available P were determined in DRL. Plants grown in soil previously cultivated produce more beans than plants grown in soil not previously cultivated. The fractions Al-P and Fe-P represent the main inorganic forms in clayey DRL, being phosphorus availability closely related with the fraction Al-P. The distributions of the inorganic fractions of P in the soil fertilized with reactive phosphate were Fe-P = 45%, Al-P = 40% and Ca-P = 15%. The phosphorus content determined by alkaline extraction (Olsen Method) was closely related to levels of Al-P and Fe-P. On other hand, the concentrations determined by extracting acids (Mehlich-1 and citric acid) were more related to the Ca-P fraction. Fe-P and Al-P inorganic forms stocked over time with successive fertilizations in Oxisol with a history of cultivation in no-tillage may return to soil solution and provide the nutrient demand of plants.