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Temporal Relations of Phosphorus Fractions in an Oxisol Amended with Rock Phosphate and Thiobacillus thiooxidans

Dep. de Biologia Geral

J. J. Muchovej

Dep. de Fitopatologia

V. H. Alvarez V.

Dep. de Solos; 36570, Viçosa, MG, Brazil

*Corresponding author.

ABSTRACT

Low-grade phosphate rock plus elemental S were added to an oxisol in combination with organic matter (OM) and/or Thiobacillus thiooxidans to study the change in P fractions with time and then study availability of P solubilized. The addition of any amendment caused a significant increase in Al-bound P. These values remained stable during the 7-wk incubation period. Soluble P and OM-bound P peaked within 3 wk and then decreased during the remaining period. The addition of T. thiooxidans plus S caused a rapid drop in soil pH to levels below 4.0 and a concurrent increase in P levels in the soil. After incubation, lime was added to the soils and sorghum grown for 30 d; even though, no additional P was incorporated. Solubilized P was sufficient for plant growth and dry matter produced by plants in soil amended with T. thiooxidans plus OM was similar to that of plants grown in soil amended with superphosphate.

Contribution from Universidade Federal de Viçosa, Viçosa, Brazil.

Received for publication July 20, 1988.