Changes in Inorganic and Organic Soil Phosphorus Fractions Induced by Cultivation Practices and by Laboratory Incubations
- 1 September 1982
- journal article
- research article
- Published by Wiley in Soil Science Society of America Journal
- Vol. 46 (5) , 970-976
- https://doi.org/10.2136/sssaj1982.03615995004600050017x
Abstract
Changes in inorganic and organic phosphorus (P) fractions resulting from 65 years of cropping in a wheat‐wheat‐fallow rotation were studied using a sequential extraction technique. Total P content of the cultivated soil was 29% lower than that of the adjacent permanent pasture; the major loss of P (74% of total P lost) was organic P and residual P. Of the total P lost, 22% was from the extractable organic P forms, whereas 52% originated from stable P.Incubation studies were used to study seasonal P transformations during simulated fallow with and without residue incorporation and P fertilization. Nine monthly additions of cellulose (765 µg C · g−1 soil) with and without P (9 µg · g−1 soil) significantly altered levels of total extractable organic P and inorganic P in incubated soils. Evidence is provided for microbial activity playing a major role in redistributing P into different forms in the soil.Keywords
Funding Information
- Natural Science and Engineering Research Council of Canada
- Post Doctorate Fellowship
- Western Cooperative Fertilizer Ltd.
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