Revista Agrogeoambiental (Feb 2022)

Phosphorus adsorption capacity in sandy textured soils with built fertility

  • Ademir Fontana,
  • Marcos Gervasio Pereira,
  • Jaqueline Jesus Santana dos Santos,
  • Guilherme Kangussu Donagemma,
  • Otavio Augusto Queiroz dos Santos

DOI
https://doi.org/10.18406/2316-1817v13n320211639
Journal volume & issue
Vol. 13, no. 3

Abstract

Read online

The specific adsorption of phosphorus in minerals from the clay fraction of the soil, such as Fe and Al oxyhydroxides, is responsible for the decrease in the availability of this element for plants. In Brazil, this condition is studied substantially in medium to very clayey textured soils, whose adsorption activity is expressive. The aim of this study was to evaluate the maximum phosphorus adsorption capacity (CMAP) in sandy-textured soils with fertility built in the Cerrado biome. Areas with representative soils were selected in the cities Luís Eduardo Magalhães (LEM / BA) and Guaraí (TO), with the following vegetation cover: a) LEM: natural vegetation and cotton; b) Guaraí: natural vegetation and soybean. Soil samples were collected in the 0-20 cm and 60-80 cm layers, in which chemical and physical analyzes were performed periodically, as well as analyzes related to phosphorus adsorption such as Prem and CMAP and PESN. Prem contents are higher in the 0-20 cm layer for the LEM region. The CMAP is not very expressive in the soils of the two studied regions, with the Guaraí soils having higher relative adsorption potential due to the higher values of the CMAP/clay ratio.

Keywords