Abstract
The mineralization of organic forms of phosphorus (P) in soil contributes significantly to plant P uptake, although quantification of organic P mineralisation has been impeded by methodological difficulties. An isotopic dilution method, based on tracer kinetic theory, was used to study the organic P flux rates for unamended and green manure amended soil in an incubation experiment carried out over 35 days. Firstly, the specific activity (SA) between two points of time as affected by dominant biological processes (under conditions of constant soil respiration rates) was determined in a series of successive labelling incubation experiments. Secondly, the instantaneous specific activity (instSA) between two points of time was also determined by shaking an unlabelled soil with 33P, i.e. soil samples that were not labelled with 33P, but kept under conditions identical to the labelled soil samples. This gives the net size of the exchangeable inorganic P pool in the labelling experiments at two points of time during incubation. The SA dilution in the labelling experiments at a constant exchangeable inorganic P pool between two times was attributed to the release of non-labelled inorganic P from the organic P pool by mineralisation. The daily gross organic P mineralisation rates for the 21 days of incubation were 0.06 and 0.27 mg P kg−1 day−1 for unamended and green manure amended soils, respectively. The study demonstrated that green manure amendment contributed to an overall increase in soil P availability through enhanced organic P mineralisation.
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Abbreviations
- P:
-
phosphorus
- C P :
-
water-soluble inorganic P
- SA:
-
specific activity
- instSA:
-
instantaneous specific activity
- F in :
-
influx
- F out :
-
out-flux
- FR:
-
flux rate
- Q :
-
exchangeable inorganic P pool
- t :
-
time
- R :
-
total 33P introduced in the unlabeled soil
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Randhawa, P.S., Condron, L.M., Di, H.J. et al. Effect of Green Manure Addition on Soil Organic Phosphorus Mineralisation. Nutr Cycl Agroecosyst 73, 181–189 (2005). https://doi.org/10.1007/s10705-005-0593-z
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DOI: https://doi.org/10.1007/s10705-005-0593-z