1. A comparison of the solubility diagram of the phosphate compounds in soils with the measured curves showing the actual relationships between phosphate potentials and lime potentials and between phosphate potentials and aluminum (or ferric) hydroxide potentials reveals that there may exist two mechanisms of phosphate fixation.
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Hong Shun-shan, Zhu Zu-xiang. THE MECHANISM OF PHOSPHATE FIXATION AND AVAILABILITY OF PHOSPHORUS AS INTERPRETED BY PHOSPHATE POTENTIALS OF SOILS[J]. Acta Pedologica Sinica,1979,16(2):94-109.