不同施肥制度对红壤耕层磷的吸持特性影响的研究

试验以耕型红壤上12年长期肥力监测定位试验不同处理土壤为材料，研究了长期定位不同施肥制度对耕型红壤磷的吸持特性的影响。研究结果表明，在0～50mg／L加磷浓度范围内，用Langmuir，Temkin和Freundlich三种恒温吸附方程都能对供试土壤磷的恒温吸附曲线加以拟合，结果均达极显著水平。各处理土壤中施用磷肥和有机肥均能提高土壤磷的解吸率，其中以OM NPK处理的土壤吸附磷的解吸率最高。

Effects of different fertilizer system in long-term stationary experiment on the sorption characteristics of phosphate by arable layer red-soils

The long-term stationary experiment was conducted to investigate the effects of different conducts on phosphate sorption of arable red soil for 12 years. Results showed that the contents of phosphate are from zero to fifty mg per liter.The adsorbed curves of the Langmuir equation,Temkin equation,Freundlich equation and phosphate isothermal adsorption of the differently treated soils are at a significance level of 1.0. Above all , the Freundlich equation is the best one and its correlation coefficient is above 0.98 . Both applying organic manure and the fertilizer of phosphate significantly increase the phosphate absorption capacity and efficiency of the differently treated soils . In the treated OM+NPK, the absorption content phosphate is the best one on the sorption phosphate of arable red soil.