Soil microbial biomass phosphorus and activity of acid phosphatases during decline of soil available phosphorus

Authors

  • Luciano Colpo Gatiboni UDESC
  • João Kaminski UFSM
  • Danilo dos Santos Rheinheimer UFSM
  • Gustavo Brunetto UFSM

DOI:

https://doi.org/10.1590/S1678-3921.pab2008.v43.386

Keywords:

soil microbial biomass, phosphorus forms, organic phosphorus, labile phosphorus

Abstract

The objective of this work was to evaluate the content of phosphorus stored in the soil microbial biomass and the activity of acid fosfatases, during the decline of soil available phosphorus, caused by successive crops in pot experiment. Samples of Oxisol were utilized with previous addition of soluble phosphates (0, 180, 360, 540, and 720 kg ha-1 of P2O5), applied in six consecutive years. The soil samples were submitted to 15 successive crops in greenhouse, without replacement of absorbed phosphorus by plants. After each three successive crops, soil was sampled, and the following variables were determined: the available phosphorus by anion exchange resin, phosphorus stored in the soil microbial biomass and the activity of acid phosphatases. As a consequenceof the reduction of the soil available phosphorus, the amount of microbial phosphorus decreased, and the activity
of phosphatases increased. In soils with low phophorus content and no plant residues, the microbial P has little importance for plant nutrition.

Author Biographies

Luciano Colpo Gatiboni, UDESC

Professor da área de química e fertilidade do solo do Departamento de Solos e Recursos Naturais da UDESC

João Kaminski, UFSM

Professor do Departamento de Solos da UFSM

Danilo dos Santos Rheinheimer, UFSM

Professor do Departamento de Solos da UFSM

Gustavo Brunetto, UFSM

Aluno de Pós-graduação em Ciência do Solo da UFSM

Published

2008-10-29

How to Cite

Gatiboni, L. C., Kaminski, J., Rheinheimer, D. dos S., & Brunetto, G. (2008). Soil microbial biomass phosphorus and activity of acid phosphatases during decline of soil available phosphorus. Pesquisa Agropecuaria Brasileira, 43(8), 1085–1091. https://doi.org/10.1590/S1678-3921.pab2008.v43.386

Issue

Section

SOIL SCIENCE