Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids |
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Authors: | Xu Ren-kou Zhu Yong-guan Chittleborough David |
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Institution: | 1. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China 2. Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3. Soil and Land System, School of Earth and Environmental Sciences, The University of Adelaide, SA 5005, Australia |
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Abstract: | Low-molecular-weight(LMW) organic acids widely exist in soils, particularly in the rhizosphere. A series of batch experiments were carried out to investigate the phosphorus release from rock phosphate and iron phosphate by low-molecular-weight organic acids. Results showed that citric acid had the highest capacity to solubilize P from both rock and iron phosphate. P solubilization from rock phosphate and iron phosphate resulted in net proton consumption. P release from rock phosphate was positively correlated with the p K _a values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with p K _a. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearly. Addition of phenolic compounds further increased the P release from iron phosphate. Initial solution pH had much more substantial effect on P release from rock phosphate than from iron phosphate. |
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Keywords: | organic acid phosphate release rhizosphere rock phosphate iron phosphate |
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