Abstract: This experiment was carried out to study the effect of fertilization on yield and nutrients absorption in japonica rice variety Zhejing 22. The results showed that rational combination of chemical fertilizers and manure showed better effect on rice yield, and the efficiency of fertilizers and absorption of nutrients increased. There was a sharply increase in rice yield and economic benefits in the MNPK treatment compared to the control, the single M and combination of chemical fertilizer NK. Compared to the control, the rice yield increased by 53% in the MNPK treatment，38% in the NP treatment, 32.3% in the MNPK’, 27% in the NPK treatment, respectively. The combination of chemical fertilizer and manure could increase the fertilizer efficiency. The absorption amount of N, P, K in grain in the MNPK treatment were 126.66 kg·hm-2, 26.91 kg·hm-2 and 45.59 kg·hm-2. And the absorption amount of nitrogen, phosphorus, potassium were 184.51 kg·hm-2，33.57 kg·hm-2 and 198.40 kg·hm-2 in the MNPK’ treatment. The highest nitrogen, phosphorus harvest index was 43.85% and 36.64% in M treatment, and the highest potassium harvest index was 54.52% in NPK treatment. According to the fertilizer input, nitrogen efficiency in all nitrogen treatments was lower than M treatment, and phosphorus efficiency in phosphorus treatment was lower than M treatment. But potassium efficiency in potassium treatment was higher than M treatment.

Key words: Zhejing 22, yield, nutrients absorption, harvest index, fertilizer use efency