侧渗水稻土磷吸附与解吸特性的研究

目的]为太湖地区侧渗水稻土经济施用磷肥提供理论依据。方法]研究太湖地区侧渗水稻土在等温条件下不同土层磷的吸附和饱和吸附后的解吸特性。结果]侧渗水稻土对磷的吸附特性和饱和吸附后的解吸特性与简单Langmuir等温吸附方程和等温解吸方程基本吻合,但不同土层对磷的吸附和饱和吸附后解吸特性表现出较大的差异,导致各土层最大解吸量占最大吸附量的百分比也有所不同。结论]太湖地区侧渗水稻土应该重点关注40~60 cm土层。

Research on Phosphorus Adsorption and Desorption Traits in Side Bleaching Paddy Soil

Objective] The study aimed to provide theoretical basis for applying phosphate fertilizer economically in the side bleaching paddy soil in the Taihu area.Method] The phosphorous adsorption trait and desorption trait after saturated adsorption in different soil layers of the side bleaching paddy soil were studied under the isothermal condition in Taihu area.Result] The phosphorous adsorption trait and desorption trait after saturated adsorption in the side bleaching paddy soil confirmed to the simple isothermal adsorption equation and isothermal desorption equation of Langmuir.But the phosphorous adsorption trait and desorption trait after saturated adsorption in different soil layers showed bigger difference,causing that the percentage of maximum desorption accounted for maximum adsorption were different.Conclusion] The emphasis attention should be put on the soil layer with depth of 40～60 cm in the side bleaching paddy soil in Taihu area.