用pH7.0的2%磷酸铵溶液,测定江苏省徐州地区不同土壤的磷酸吸收系数.多元回归分析表明,吸收系数与物理粘粒的偏相关系数达极显著水平(r=0.8319);与有机质含量、pH和CaCO_3含量则未达显著水平.根据当地化肥网试验结果和禾谷类作物年耗磷量等参数,提出以磷酸吸收系的S%为“维持”施磷量. The phosphoric acid absorption coefficients of different soils in Xuzhou, Jiangsu Province were determined by using 2% ammonium phosphate solution at pH 7.0.The multiple regression analysis showed that the partial correlation coefficient between absorption coefficient and physical clay reached an extremely significant level (r = 0.8319) Content, pH and CaCO_3 content did not reach the significant level.According to the local fertilizer net test results and annual phosphorus consumption of cereal crops and other parameters, it is proposed to use phosphoric acid absorption S% as “maintain” the amount of phosphorus.