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Hydrolysis and Availability of Pyrophosphate in Tropical Soils¹

ABSTRACT

Hydrolysis and retention of pyrophosphate were studied in selected Nigerian soils. Hydrolysis proceeded readily in the surface soils with half-lives ranging from 4 to 14 days. Rate of hydrolysis was much slower in the subsoils when compared with their corresponding surface soils. The pyrophosphate halflives in these subsoil samples ranged from 16 to more than 64 days. It was also found that the subsoil samples retained more pyrophosphate resistant to hydrolysis than associated surface soil.

Soils retained greater amounts of pyrophosphate than orthophosphate against 1N NH₄Cl extraction although the relative amounts retained by the soils studied followed the same trend.

A short-term P uptake experiment showed that pyrophosphate could be considered as equally effective as orthophosphate as sources of P for plants.

¹ Contribution from the Interantional Institute of Tropical Agriculture, P.M.B. 5320, Ibadan, Nigeria. Journal Paper No. 2.

² Soil Chemist and Research Assistant, respectively.

Received for publication July 31, 1972. Accepted for publication November 15, 1972.