Changes in distribution of inorganic soil phosphorus forms with phosphate desorption by iron oxide‐impregnated paper strips
作者:
R. Indiati,
A. N. Sharpley,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1998)
卷期:
Volume 29,
issue 5-6
页码: 625-634
ISSN:0010-3624
年代: 1998
DOI:10.1080/00103629809369972
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The release of soil phosphorus (P) to solution has been described by extraction of soil with iron (Fe)‐oxide coated paper strips. Little information is available, however, on where this P is coming from. The effect of removal of reversibly adsorbed soil P on the distribution of inorganic P forms was investigated for 12 Italian soils. Phosphate was removed from these soils by Fe‐oxide strips after incubation with P (0 and 100 mg P kg‐1) for 90 days. With no applied P, 3 to 17% of the total soil active P [saloid‐P, aluminum‐phosphate (Al‐P), iron‐phosphate (Fe‐P), and calcium‐phosphate (Ca‐P) was removed by the Fe‐oxide strips. The change in strip‐P following P addition (100 mg kg‐1soil), ranged from 12.9 to 53.5 mg P kg‐1, with P coming almost entirely from the active P fractions. A close relationship between the changes in desorbed strip‐P after P equilibration and soil P sorption index (SI) was found for the studied soils (r2=0.96). Thus, the release of soil P for plant uptake or transport in runoff was a function of the amount of “actively”; sorbed P and an estimate of P sorption.
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