Exploring the utilization of different fraction of P by different plants which could secrete different LMWOA under the condition of P-deficiency.
栽种能够分泌不同有机酸的植物，考察不同植物对土壤不同组分无机磷的活化利用情况；
The feasible mass fraction of organic activation agent is 3% for hard-soluble P but 14% for water-P.
有机活化剂的用量，用于难溶性磷促释时其质量分数为3%，用于水溶性磷控释时其质量分数约为14%。
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