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Mineralization of Phosphorus in Sludge-Amended Soils Monitored by Phosphorus-31-Nuclear Magnetic Resonance Spectroscopy

Soil Science Dept., 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611

A. C. Chang

Dep. of Soils and Environmental Sciences, Univ. of California, Riverside, CA 92521

R. W. K. Lee

Chemistry Dep., Univ. of California, Riverside, CA 92521

*Corresponding author.

ABSTRACT

The purpose of the experiment was to observe the changes occurring in the different phosphorus (P) pools in sludge-amended soils during incubation using ³¹P nuclear magnetic resonance spectroscopy (³¹P NMR) to qualitatively and quantitatively register P transformations. An acid and an alkaline soil were each incubated with sludges that underwent different digestion processes. The ³¹P NMR spectra of those soils after 1, 28, 70, and 140 d of incubation showed that P diesters completely hydrolyzed after 28 d of incubation in both soils, irrespective of the type of sludge incorporated. After 140 d of incubation, P monoesters were still detected in the acid soil while they had completely hydrolyzed in the alkaline soil. Pyrophosphates were detected after 70 d of incubation in the alkaline soil and 140 d of incubation in the acid soil. The study suggested that acidity has an adverse effect on the microbial degradation of P monoesters and pyrophosphates in sludge-amended soils.

Contribution from the Dep. of Soil and Environmental Sciences and the Dep. of Chemistry, Univ. of California, Riverside, CA 92521.

Received for publication November 9, 1987.

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