Abstract:

In order to explore the effect of slow-release nitrogen fertilizer on winter wheat production, a field experiment was conducted in Daishan County, Zhejiang Province from 2020 to 2022 using Yangmai 16 as the material. The effects of slow-release nitrogen fertilizer at different release periods on wheat yield, nitrogen accumulation, apparent nitrogen use efficiency, agronomic efficiency and partial productivity were studied. The results showed that compared with conventional fertilization, the slow-release and controlled-release nitrogen fertilizer at the two release stages significantly increased the yield of wheat. From 2020 to 2021, slow-release nitrogen fertilizer significantly increased nitrogen uptake in wheat compared with conventional fertilization, but there was no significant difference in total nitrogen uptake between CF, CRU60 and CRU90 treatments in 2021-2022. Compared with CF treatment, the apparent nitrogen use efficiency, agronomic efficiency and partial productivity of wheat treated with slow-release nitrogen fertilizer increased by 3.4-6.0 percentage points, 10.4%-19.8% and 3.9%-7.5%, respectively. In conclusion, the last basic application of slow-release nitrogen fertilizer with a slow-release period of 90 days in wheat production can achieve the effects of increasing efficiency, saving labor and saving costs.

Key words: wheat, yield, nitrogen accumulation, nitrogen use efficiency