Summary
The effect of organic amendments (cow manure and green manure) on monthly variations of soluble P in a volcanic-ash-derived soil was studied. Soluble P (Truog's method) showed minimums at the beginning of August and at the beginning of January. Cow manure produced a remarkable increase of soluble P and removed the January minimum. In soils treated with legume green manure, soluble SP markedly decreased during the first and second month. Data for organic P suggested that the summer decreases of soluble P were partly due to microbial immobilization. In soil treated with mineral fertilizers only, more than half of the P added as superphosphate was found as Al and Fe phosphate after one month. Organic amendments, especially cow manure, decreased the immobilization of superphosphate P.
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Felleca, D., Ramunni, A. & Scialdone, R. Monthly variations of soluble P in a volcanic ash derived soil as affected by organic and mineral fertilizers. Plant Soil 74, 67–74 (1983). https://doi.org/10.1007/BF02178741
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DOI: https://doi.org/10.1007/BF02178741