A dual radiotracer study of transformations of organic, inorganic and plant residue phosphorus in soil in the presence and absence of plants [oats].
1988
Friesen D.K. | Blair G.J.
Equilibration of 33P-labelled phosphate solution added to soil reached a steady state with soil Al-P and Fe-P pools within 1 day after addition. The Fe-P pool was much more stable than the Al-P pool since it was not depleted by cropping. This non-labile pool 'fixed' over 30 percent of the 33P added and similar amounts of the 32P released from plant residues. About 50 percent of the 32P from plant residues was found in inorganic P pools 11 days after addition. This rapid release was attributed to the presence of soluble inorganic P in the residues. A further 10 percent was released slowly over the remainder of the experiment. Cropping only marginally slowed rates of transfer of inorganic and released residue P into non-labile pools. Cropping had no effect on the rates of release of P from crop residues.
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