Abstract:

In order to investigate the effects of slow-release fertilizer on double-cropping rice yield and fertilizer utilization rate in central Zhejiang, a field trial was conducted in 2022, and 8 treatments were set. In the early rice season, the grain yields of ZNK, ZNP and ZHLG treatments increased by 45.42%, 43.59% and 70.33%, respectively, compared with ZPK treatment. The fertilizer utilization efficiency of nitrogen, phosphorus and potassium in ZHLG treatment was 40.94%, 27.10% and 72.50%, respectively. In the late rice season, the grain yield of 667 m² of rice treated with WHLG was the highest, which was 536.3 kg, 6.81% higher than that of WPK treatment. The fertilizer utilization efficiency of nitrogen, phosphorus and potassium in WHLG treatment was 41.00%, 21.50% and 73.50%, respectively. In conclusion, the application of slow-release fertilizer in the production process of double cropping rice in central Zhejiang can effectively improve rice yield and nitrogen fertilizer use rate, which is a more scientific and reasonable fertilization method.

Key words: slow release fertilizer, double cropping rice, rice, yield, fertilizer utilization rate