在浙江、江西、广西等地进行肥料试验和长期定位试验,并对早、晚稻不同生育时期体内氮、磷、钾、钙、镁等养分元素进行了分析测定,最后比较了连作早、晚的产量.结果表明,连作早稻产量高于连作晚稻,这与早稻吸收养分元素较多有关. Fertilizer experiment and long-term experiment were carried out in Zhejiang, Jiangxi, Guangxi and other places, and the nutrient elements such as nitrogen, phosphorus, potassium, calcium and magnesium in different growth stages of early and late rice were analyzed and determined. Finally, Yield.The results showed that the yield of continuous cropping early rice was higher than that of continuous cropping late rice, which was related to the nutrient elements uptake by early rice.