Studies on the interrelation between soil fertility and crop growth of five paddy soils collected from the southern part of Jiangsu province were conducted in pot egperiment.Rice,millet and soybean were used as first crop,each followed by bare-barley as the second crop,and the third crop was rice.The result obtained indicated that potential fertility of soils quite differed from their available fertility,and each soil had their own characteristics.Even though the yields of three crops were not alkali-hydrolyzable nitrogen,mineralizable nitrogen only correlated with total nitrogen,or available phosphorus content in soils,but also with the nitrogen content or phosphorus content extent,the results obtained were not significant statistically.in those plants to some Thus it seems that the yields of crops or nutrient composition of plants were determined by many factors.