CHANGES OF SOIL PHOSPHORUS POOL UNDER LOW-INPUT PHOSPHORUS FERTILIZATION SYSTEM Ⅱ.SOIL AVAILABLE PHOSPHORUS AND THE COMPOSITION OF SOIL INORGANIC PHOSPHORUS
The results from a nine-year field experiment on a carbonate cinnamon soil indicated that the continuous low-input of phosphorus fertilizer with 14.4 kg P/ha annually could slighty increase soil Olsen-P and labile-P to the level as "non-deficiency" of phosphorus but far from setting up a large available phosphorus pool. The application of phosphorus fertilizer combined with recycled phosphorus from pig manure every year seemed to be able to set up a large available phosphorus pool finally. The role of phosphorus in pig manure was similar to that of fertilizer phos-phorus in improving soil available phosphorus pool. However, the application of phos-phorus every year with low dose was much better in increasing soil Olsen-P,labile-P and Ca2-P than the treatment with high dose once every six years.
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Chen Xin, Yu Wantai, Shen Shanmin. CHANGES OF SOIL PHOSPHORUS POOL UNDER LOW-INPUT PHOSPHORUS FERTILIZATION SYSTEM Ⅱ. SOIL AVAILABLE PHOSPHORUS AND THE COMPOSITION OF SOIL INORGANIC PHOSPHORUS[J]. Acta Pedologica Sinica,1997,34(1):81-88.