African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

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

Julian Junio de Jesus Lacerda1*, Antonio Eduardo Furtini Neto1, Alvaro Vilela de Resende2, Jose Zilton Lopes dos Santos3, Leandro Flavio Carneiro4 and Cesar Henrique Caputo de Oliveira1
1Federal University of Lavras, P. O. Box 3037, 37200-000, Lavras, Minas Gerais, Brazil. 2Brazilian Agricultural Research Corporation, P. O. Box 285, 35701-970, Sete Lagoas, Minas Gerais, Brazil. 3Federal University of Amazonas, Avenue General R. O. J. Ramos, 3000, University Campus, Manaus, Amazonas, Brazil. 4Federal University of Goias, P. O. Box 131, 74001-970, Goiânia, Goiás, Brazil.
Email: [email protected]

  •  Accepted: 01 July 2013
  •  Published: 11 July 2013

Abstract

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.

 

Key words: Cerrado soil, phosphorus fertilization, phosphorus fractionation, inorganic phosphorus.