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Effects of the Addition of Phosphorus and Inorganic Nitrogen on Carbon and Nitrogen Mineralization in Andepts From Colombia¹

ABSTRACT

This study tested the hypothesis that the level of available P in volcanic ash soils is a rate-limiting factor for organic matter mineralization. Additions of calcium phosphate to give levels of P of 1,200 and 2,400 ppm significantly increased the amount of N mineralized and CO₂ evolved as compared to soils not treated with P. Although the addition of glucose to these soils increased CO₂ evolved, there was significantly more CO₂ evolved in the presence of glucose and P than when glucose had been the only addition. Amendment of the soils with N did not have any significant affect on the rate of CO₂ evolution. Both N and P additions stimulated N mineralization. The PxN interaction was also significant for C and N mineralization. It was concluded that available P is a rate-limiting factor for organic matter mineralization in Andepts.

¹ Paper Number 5036 of the Journal Ser. of the North Carolina Agric. Exp. Stn., Raleigh, NC 27607 and a contribution of the Instituto Colombiano Agropecuario (ICA), Apartado Aereo 151123 Bogota, Colombia. Supported in part by contract AID/CSd 2806 with the U.S. Agency for International Development. This paper was presented before Div. A-6, Am. Soc. of Agronomy, Chicago, Ill., 14 Nov. 1974.

² Former Graduate Student at N. C. State Univ., now Tecnico Cientifico, Soils Program, Instituto Colombiano Agropecuario (ICA); and Associate Professor, Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27607, respectively.

Received for publication August 5, 1976. Accepted for publication December 29, 1976.

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