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应用Langmuir等温式解释土壤磷吸收附等温线,具有良好的适合性。在24个供试土壤中,有21个土壤的相关系数达到极显著水准,3个达显著水准。通过Langmuir等温式可获得土壤吸磷参数——最大吸磷量(Xm)和吸附平衡常数(K)。Xm值可以衡量土壤磷库的大小,K值反映了土壤吸磷反应自由能下降的程度。Xm和K与磷肥利用率呈极显著负相关,其相关系数分别为-0.7146、～0.6233。不同性质的土壤,适宜作物生长的土壤平衡溶液磷浓度差异不大。当土壤平衡溶液磷浓度为0.1ppm P时,水稻产量可达最高产量的95％以上。因此,可根据Langmuir方程计算出满足水稻正常生长所需要的磷肥施用量。
The application of Langmuir isotherm to explain the adsorption of soil phosphorus isotherms with good adaptability. Among the 24 tested soils, the correlation coefficient of 21 soils reached extremely significant level and 3 reached significant level. Soil P uptake parameters - maximum P uptake (Xm) and adsorption equilibrium constant (K) were obtained by Langmuir isotherm. Xm value can measure the size of soil phosphorus pool, K value reflects the degree of decline of soil phosphorus free energy. Xm and K showed extremely significant negative correlation with phosphorus utilization rate, and the correlation coefficients were -0.7146 and -0.6233, respectively. Different types of soil, suitable for crop growth in soil balance solution phosphorus concentration little difference. When the phosphorus concentration in soil balance solution is 0.1ppm P, the yield of rice can reach more than 95% of the highest yield. Therefore, according to the Langmuir equation can be calculated to meet the normal growth of rice required phosphate fertilizer application.