关键词: 水稻, 缓控释肥, 减肥, 氮肥偏生产力, 氮肥贡献率

Abstract:

In order to explore the effects of different fertilization methods on fertilizer reduction and yield increasing, a comparative study on the application of slow-release fertilizer and conventional quick-effect fertilizer was carried out in this paper. The results showed that, the maturity stage of rice with fertilization was delayed by 3 days compared with the control without fertilization, and there was no difference among different fertilization treatments. Tillers mainly occurred in single cropping rice from 23 d to 38 d after transplanting, which could be promoted by fertilization. There was little difference in tiller number between conventional fertilization treatment and slow-released fertilization treatments. Compared with the conventional fertilization treatment, the average partial productivity of nitrogen fertilizer and nitrogen contribution rate of slow-released fertilizer treatments were increased by 26.1% and 34.4% respectively, nitrogen fertilizer was reduced by 19.3%, and the yield was increased by 1.7%. “Haolegeng” organic slow-released fertilizer and “Daojianqiang” slow-released fertilizer performed the higher rice yield and nitrogen use efficiency. Compared with the conventional fertilization treatment, the economic benefits of slow-released fertilizer treatments （treatment 2, 3 and 4） were increased by 236.10 yuan, 138.80 yuan and 89.20 yuan per 667 m2 respectively.

Key words: rice, slow-released fertilizer, fertilizer reduction, partial productivity of nitrogen fertilizer, contribution rate of nitrogen fertilizer