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Published in Soil Sci Soc Am J 37:60-63 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Persistence of Manure Phosphorus Availability in Calcareous Soil1

J. L. Abbott and T. C. Tucker2

ABSTRACT

Reappraisal of animal manure as fertilizer has shown manure to be an effective P source in calcareous soils. Correlations for data from cotton (Gossypium hirsutum) and barley (Hordeum vulgare) experiments indicated manure benefits to be largely the result of providing available P to the crop. Residual effects of manure P were measured by alfalfa (Medicago sativa) P uptake, yield and soil analyses following 4 years of cropping to cotton and 1 year of barley. Soluble P in Mohave clay loam manured at 22 metric tons/ha 4 years before sampling was above that of unmanured soil. Manuring at 2- or 3-year intervals at 22 metric tons/ha appears to assure adequate P availability, while P availability from phosphate fertilizers may be negligible over the same period. The stable nature of manure organic matter, stimulation of microbiological activity and association of P with organic components of the soil may account for the resistance of manure P to processes removing phosphate fertilizer P from available forms.

NOTES

1 Contribution from the Dep. of Soils, Water, and Engineering, Arizona Agr. Exp. Sta., Tucson, Arizona 85721. Published with the approval of the Director as Journal Article No. 1872.

2 Assistant Agricultural Chemist, Professor and Soil Scientist, Department of Soils, Water, and Engineering, Univ. of Arizona, respectively.

Received for publication April 19, 1972. Accepted for publication October 16, 1972.






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Copyright © 1973 by the Soil Science Society of America.