Incubation and pot experiments were conducted to study changes in organic-P fractions in calcareous soils after application of pig slurry and monopotassium phosphate (MPP) and their contributions to Puptake by rye grass.The results indicated that: (1) Liable, moderately liable and moderately stable organic-P of soils increased markedly after the application of pig slurry and MPP, with the middle one being mostly increased; (2) The liable and moderately liable organic-P made greater direct contribution to the total amount of P uptake by rye grass and all the three organic-P fractions had some indirect contribution; (3) Based on their comprehensive effects on the amount of P uptake by rye grass, the three organic-P fractions ranked in such order: liable organic-P > moderately liable organic-P > moderately stable organic-P.
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Yin Jin-lai, Shen Qi-rong, Zhou Chun-lin, Hong Li-zhou, Wang Kai, Ding Jin-hai, Wang Mao-wen. EFFECTS OF PIG SLURRY AND PHOSPHATIC FERTILIZER ON ORGANIC-P FRACTIONS AND THEIR AVAILABILITIES[J]. Acta Pedologica Sinica,2001,38(3):295-300.