The difference in response of nine rice varieties to nitrogen,phosphorus and potassium nutrient

Field trial was conducted to study the effect of fertilization on the yield,nutrient uptakes and nitrogen use efficiency of 9 rice varieties,and to compare the differences in response of different varieties of rice to nutrients in order to provide evidence for scientific fertilization of rice. The results showed that the grain yields of each variety of rice were 5 312 ~ 7 473 kg /hm2 with the coefficient of variation of 10%,and the average was 6 444 kg / hm2 for all the CK treatments. Fertilization( NPK)improved the yield significantly by 3 240 ~ 5 578 kg / hm2 for each variety of rice than CK,and the average yield increased was4 262 kg / hm2. The increase rates of yield were 47. 2% ~ 91. 3%,and the average was 66. 1%. Under the test conditions,nitrogen( N) application improved significantly the grain yield and N uptakes of different varieties of rice,which were increased by 39. 6% ~ 90. 9% and 59. 4% ~ 157. 8%,respectively. Phosphorus and potassium fertilizer application had no significant effect on the yield of rice. There were also great differences of N use efficiency among different varieties of rice,which were 23. 2% ~ 53. 8%.