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Processes governing phosphorus availability in temperate soils
Processes governing phosphorus availability in temperate soils
Frossard, E Condron, L Oberson, A Sinaj, S Fardeau, J
Frossard, E
Condron, L
Oberson, A
Sinaj, S
Fardeau, J
Date
2000
Type
Journal Article
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Abstract
Phosphorus losses from agricultural soil to water bodies are mainly related to the excessive accumulation of available P in soil as a result of long-term inputs of fertilizer P. Since P is a nonrenewable resource, there is a need to develop agricultural systems based on maximum P use efficiency with minimal adverse environmental impacts. This requires detailed understanding of the processes that govern the availability of P in soil, and this paper reviews recent advances in this field. The first part of the review is dedicated to the understanding of processes governing inorganic P release from the solid phase to the soil solution and its measurement using two dynamic approaches: isotope exchange kinetics and desorption of inorganic P with an infinite sink. The second part deals with biologically driven processes. Improved understanding of the abiotic and biotic processes involved in P cycling and availability will be useful in the development of effective strategies to reduce P losses from agricultural soils, which will include matching crop needs with soil P release and the development of appropriate remediation techniques to reduce P availability in high P status soils.
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Copyright © 2000 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America