The relationship between fertilization and yield of high-yield paddy field in middle and lower reaches of Yangtze River

According to the investigation on 19 high-yield paddy field with yield and fertilization and different cropping system and farmland management in Hunan,Jiangxi,Zhejiang,Anhui and Hubei Province,the relationship between fertilization and yield were studied.The results showed that the yield in double rice system and rape-rice rotation field were about 16 893 and 13 000 kg/hm2.The optimum amount of N,P2O5 and K2O fertilization in double rice system were about 461,130 and 430 kg/hm2,and the ratio of N∶ P2O5∶ K2O was about 1∶ 0.28∶ 0.85.The optimum amount of N,P2O5 and K2O fertilization in rape-rice rotation field were about 200,145 and 250 kg/hm2,and the ratio of N∶ P2O5∶ K2O was about 1∶ 0.72∶ 1.23.