关键词: 缓（控）释肥料, 双季稻, 产量, 经济效益

Abstract:

In order to reduce the use of chemical fertilizers and improve the economic benefits of rice, the slow（controlled） release fertilizers were applied on rice production to evaluate the effects on yield, nitrogen use efficiency and economic efficiency of double cropping rice. The results showed that, in early season rice, compared with the conventional fertilization treatment（C1）, the yield of controlled release fertilizer treatment（C5） increased by 4.49%, while the yield of lignin slow release fertilizer treatments （C3, C4） and slow release formulated fertilization treatment（C2） decreased by 0.60%~6.05%. In late season rice, compared with C1, the yields of C2, C3, C4 and C5 increased by 1.01%~3.59%. The nitrogen agronomic efficiency（NAE） of C3﹑C4 and C5 treatment were higher than that of C1 treatment. Compared with C1 treatment, the economic benefit of C5 treatment increased by 2.01% under the nitrogen fertilizer application reduced by 9.82%, while the economic benefits of C3 and C4 treatment were merely decreased by 0.67% and 1.07% under the nitrogen fertilizer application reduced by 19.44% and 21.44%, respectively. Comprehensive consideration of grain yield, fertilizer utilization efficiency and economic benefits, controlled release fertilizer and lignin fertilizer could still obtain higher grain yields and NAE while reducing the amount of nitrogen fertilizer, and achieve better ecological benefits without reducing economic benefits, which has good prospect of promotion and application.

Key words: controlled release fertilizer, double cropping rice, yield, economic efficiency