Abstract:

This study aimed to assess the effects of slow-release fertilizer quota application on yield, nitrogen accumulation and nitrogen use efficiency of double-cropping late rice. This paper would provide a theoretical basis for the popularization and application of slow-release fertilizer quota fertilization technology in late rice in southern Zhejiang. Five treatments were set up simultaneously in Feiyun and Mayu Town of Ruian City: no nitrogen fertilizer (CK), conventional fertilization (CF1), conventional reduced nitrogen application (CF2), formula fertilizer quota application (PF) and slow-release fertilizer quota application (SF). The results showed that compared with CF1 treatment, CF2 treatment increased the yield of late rice by 2.65%-4.88%. Compared with CF1 treatment, the yield of PF and SF increased by 8.00%-9.76% and 10.20%-12.70%, respectively. Compared with CF2 treatment, the yield of PF and SF increased by 4.65%-5.20% and 7.34%-7.45%, respectively. The synergistic effect of SF treatment was better than that of PF treatment. Compared with CF1 and CF2 treatments, SF treatment improved the apparent nitrogen fertilizer utilization, agronomic efficiency and partial productivity of late rice, while the nitrogen fertilizer utilization rate of late rice treated by PF treatment was different in the two experimental sites. In summary, for the production of double-cropping late rice in southern Zhejiang, the application of slow-release fertilizer quota system has the effect of saving labor and increasing efficiency, and has positive promotion and application value.

Key words: late rice, quota fertilization, slow-release fertilizer, yield, nitrogen use efficiency