柠檬酸对土壤磷释放与吸附的影响

Effects of Citric Acid on the Release and Absorption of Soil Phosphorus

本文研究了柠檬酸对土壤磷释放和吸附的影响。结果表明:柠檬酸对土壤磷素的释放有促进作用,土壤磷释放量与柠檬酸浓度之间的关系可用数学模型定量表示。在柠檬酸浓度较低时,外源加入磷量对平衡液中磷浓度起主导控制;当柠檬酸浓度较高时,柠檬酸起主导作用。柠檬酸处理后,平衡液中磷含量与土壤磷吸附量之间可以用肥力—产量模型来表示。

The effects of citric acid on the release and absorption of phosphorus in soil experiment were studied by isothermal adsorption. The results showed that the citric acid promoted the release of the soil phosphorus, and their relation could be expressed by a mathematical formula. When the citric acid concentration was low, the concentration of phosphorus added in the balance liquid played a main role in controlling the phosphorus concentration in the balance liquid. When the citric acid concentration was high, it was the main factor controlling the phosphorus concentration. When the soil was added citric acid, the relation between the phosphorus concentration of the soil balance liquid and the amount of soil phosphorus adsorbed could be expressed with fertility-output formula.