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Effects of Long-Term Fertilization on the Form of Inorganic Phosphorus and the Characteristic of Adsorption and Desorption in Black Soil
- Lv, Haiyan, Yang, Hongtao
- Communications in soil science and plant analysis 2019 v.50 no.6 pp. 763-771
- adsorption, desorption, energy, equations, inorganic phosphorus, phosphates, soil, sorption isotherms
- Changes of inorganic phosphorus forms and the characteristics of phosphorus adsorption and desorption were studied under a long-term fertilization experiment in black soil. Results showed that the forms of inorganic phosphorus ranged as O–P < Ca₂–P < Ca₈–P < Al–P < Ca₁₀–P < Fe–P. Therefore, Fe–P was the main inorganic phosphorus form in this study. The capacity of phosphorus adsorption with phosphate treatments was higher than with no-phosphorus treatments. The optimal fitted equation was the Langmuir equation. Phosphorus desorption was related to the binding energy. Positive correlation between phosphorus adsorption and desorption without phosphorus addition was found; however, negative correlations among the phosphate treatments had been observed.