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Phosphorus Fertilizer as a By-product of Energy Production from Agricultural Wastes¹

ABSTRACT

Three pot experiments were conducted to test the utilization of ash from different kinds of animal manures and vegetative crop residues as source of phosphorus fertilizer. Corn (Zea mays L.) yield grown on phosphorus-deficient soil (Aiken loam), treated with acidified ash at rates equivalent to 200, 400, 800, and 1,200 ppm P, responded almost like concentrated super phosphate (CSP) at the same rates.

Yields from pots treated with ash acidified at 50% of its base equivalent were slightly less than those at 100% acidification. The leached acidified ash of agricultural waste materials proved to be a comparable source to CSP fertilizer.

Key Words: alkalinity of agricultural waste ash • phosphorus content of agricultural waste ash • P uptake by corn plants

¹ Contribution from the Soils and Plant Nutrition Section, Dep. of Land, Air, & Water Resour., Univ. of California, Davis, CA 95616. This work was made possible through special funds provided by the Western Regional Research Funds W-124.

² Formerly, Postgraduate Research Scientist, Research Assistant, Postdoctoral Research Scientist, and late Professor of Soil Science at the Univ. of California, Davis, respectively.