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Phosphorus Solubility in Sludge-amended Calcareous Soils¹

ABSTRACT

Sludge additions to calcareous soils in New Mexico increased water soluble and NaHCO₃-extractable P as well as plant uptake of P, whereas inorganic fertilizer P has often been ineffectual. This paper describes attempts to explain sludge effects in terms of increased solubility of secondary Ca-P solid phases (e.g., tricalcium and octacalcium phosphate) in amended calcareous soils. Both greenhouse and field data, representing several croppings of amended soils were examined. Ancillary effects, primarily slight pH reductions, associated with sludge additions to the soils were apparently responsible for increased P solubility in amended soils.

Key Words: Ca phosphates • solubility diagrams • fertilization • soil amendments

¹ Journal article no. 1191. New Mexico Agric. Exp. Stn., Las Cruces, NM 88003.

² Professor, Research Specialist, and Technician, respectively. Crop and Soil Sci. Dep., New Mexico State Univ., Las Cruces.

Received for publication September 23, 1985.

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