According to the results obtained from field experiments laid on phosphatic fertilizer and from the fractionation of soil phosphorus,the writers classified the important soil types of Kiangsu Province into three groups:(1) Soils rich in phosphatic nutrients gave no response to superphosphate by all crops.Soils of this type include neutral grey-brown loamy clay derived from Hsiashu loam of Nanking district,calcareous sandy loam derived from alluvial deposits of lower Yangtze plain and neutral clayly paddy soil from lacustsine deposits of Su-Chou district.