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在黄棕壤和棕红壤上施用磷肥，经三年室内湿润条件下培养，用石灰性土壤无机磷分级方法测定各形态磷含量.各形态用增量的分配比例表明，Fe-P居首位，其次为Al-P和O-P.三级Ca-P之和在20％以下.经培养的土壤种植黑麦草，其生物量和吸磷量与各形态磷量的相关系数除Ca10-P外，均达到极显著水准.土壤有效磷与各形态磷的相关性表明，Ca2-P是土壤有效磷的直接给源（r=0.992），Fe-P、Al-P是有效磷的重要潜在性给源（r分别为0.982和0.914），O-P、Ca10-P为无效态磷（r=-0.168）.
Phosphorus fertilizers were applied to yellow-brown soil and brown-red soil, and after three years of indoor humid conditions, the content of phosphorus in various forms was determined by calcareous soil inorganic phosphorous fractionation method. , Followed by Al-P and OP.The third grade Ca-P is less than 20% .The ryegrass planted in cultivated soils, the correlation coefficient of biomass and P uptake and the content of phosphorus in all forms except Ca10-P, Reached the extremely significant level.The correlation between soil available phosphorus and various forms of phosphorus showed that Ca2-P was the direct source of soil available phosphorus (r = 0.992), and Fe-P and Al-P were the important potential of available phosphorus Source (r = 0.982 and 0.914, respectively). OP and Ca10-P were inactive phosphorus (r = -0.168).