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采集代表性土壤样本7个,用Fox和Kamparth提出的方法进行磷的等温吸降研究,最后以Langmuir,Freundlich和Temkin公式描述。结果表明,要保持平衡液磷(P)浓度0.3ppm时土壤吸磷量在24～94μg/kg土,平均为55.9μg/kg土,再应用作物反应参数,在土壤标准需磷量和土壤有效磷含量之间建立预测模型。高钙土吸附磷的主要形态是Ca-P,低钙土则为Al-P和Fe-P。土壤对磷既有化学吸附,也有物理吸附,NaHCO_3液浸提出的磷,则以化学吸附为主;水浸提磷可能是物理和化学吸附二者兼有。
Seven representative soil samples were collected and studied for the isothermal desorption of phosphorus using the method proposed by Fox and Kamparth and finally described by the Langmuir, Freundlich, and Temkin equations. The results showed that in order to maintain the balance of phosphorus (P) concentration of 0.3ppm soil P uptake in the range of 24-94μg / kg soil, an average of 55.9μg / kg soil, and then the application of crop response parameters in soil standard phosphorus demand and soil available Phosphorus content between the establishment of a predictive model. The main form of phosphorus uptake by high-calcium soil is Ca-P, while the lower-soil calcium is Al-P and Fe-P. Soil chemical adsorption of both phosphorus, but also physical adsorption, NaHCO_3 liquid leaching of phosphorus, the main chemical adsorption; phosphorus may be the physical and chemical adsorption of water both.