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黔东30个各类型低产田对磷的吸附与释放的研究结果表明:磷吸持容量和Lang-muir等温吸附方程式都能很好反映土壤吸磷特征。磷吸持容量与Langmuir方程计算的最大吸附量之间相关极显著（r=0.9826）。不同类型低产田磷吸持容量差别很大。其中以黄大泥田最高（平均232mg P/100g土）,砂泥田类最小（平均不到100mg P/100g土）。土壤的磷吸持容量与磷释放率呈负相关关系。影响磷吸持容量的因素主要有:粘粒、有机质、游离铁和碳酸钙含量。其中以游离铁含量的影响最显著。土壤游离铁含量每亩增加1％,磷吸持容量增加约30mg P/100克±。
The results of the adsorption and release of phosphorus by 30 low-yielding fields in eastern Guizhou showed that the phosphorus uptake capacity and the Langmuir isotherm equation can well reflect the characteristics of phosphorus uptake by soils. The correlation between phosphorus sorption capacity and the maximum sorption capacity calculated by Langmuir equation was significant (r = 0.9826). Different types of low-yielding phosphorus adsorption capacity varies widely. Among them, Huangda muddy field had the highest (average 232mg P / 100g soil) and the lowest sand mud field (average less than 100mg P / 100g soil). Soil phosphorus holding capacity and phosphorus release rate was negatively correlated. Affect the phosphorus adsorption capacity of the main factors are: clay, organic matter, free iron and calcium carbonate content. Among them, the effect of free iron content is the most significant. Soil free iron content increased by 1% per mu, phosphorus uptake capacity increased by about 30mg P / 100g ±.