【摘要】 研究了徐淮地区石灰性土壤中磷肥（过磷酸钙）不同用量（０，１１２５，２２５０，３３７５ｋｇ／ｈｍ２）对土壤供磷和作物生长的影响．结果表明：石灰性土壤肥料残留磷的形态主要为磷酸二钙、磷酸八钙，前者对作物有效性大于后者；施用磷肥有明显的残效，磷肥的增产效果受到磷肥残效的影响；而Ｏｌｓｅｎ－Ｐ，Ｃｏｌｗｅｌｌ－Ｐ，Ｒｅｓｉｎ－Ｐ，均能较好地反映土壤中残效磷的状况。更多还原

【Abstract】 Experiments were carried out in Huaiyin County with different rates of phosphate application(0,1 125,2 250,3 375kg/hm2)on calcarcous oils.The results were as follows:1.The forms of residual phosphate were octocaicium phosphate(OCP)and dicalcium phosphate dihydratc(DCPD)which could release phosphorus to some extent for plant uptake.The Availability of DCPD was higher than that of OCP.2.Response of plants to the application of phosphate fertilizers depended on residual phosphate avail ability.3.Both Olsen-P and Resin-P,Colwcll-P could be used to evaluate the residual phosphate in calcareous soils.Colwell-P and Resin-P reprcsented the pool of available phosphorus and correlated with the degree of staturation of various phosphate.更多还原