江苏里下河地区由于历史上低洼冷湿,土壤速效磷含量较低,到目前为止,全区还有50%左右的耕地面积速效磷含量在5ppm以下,不能满足水稻正常生长对磷素的需要.本试验采用~(32)P示踪技术,试图探明水稻对磷素吸收利用的特点及不同类型中籼品种对磷素吸收利用上的差异,为生产上合理施用磷肥提供理论依据. Due to the history of low-lying cold and wet in the Lixiahe area, the content of available phosphorus in the soil is low. So far, about 50% of available phosphorus in the cultivated land is below 5ppm in the region, which can not meet the requirement of normal growth of rice for phosphorus In this study, ~ (32) P tracing technique was used to explore the characteristics of phosphorus uptake and utilization by rice and the differences in absorption and utilization of phosphorus by different types of medium indica rice varieties, and provide a theoretical basis for the rational application of phosphate fertilizer in production.