于2019年在浙东单季稻区2种不同类型土壤中开展了不同减氮模式下甬优1540产量和氮素利用率差异的田间试验。结果表明,与人工撒施肥处理相比,机械侧深施处理每穗粒数显著提高,稻谷平均增产3.0%~8.2%;氮肥减量20%（192 kg/hm²）,撒施条件下会导致水稻一定程度减产,但侧深施方式下可以保证水稻稳产并大幅提高氮肥利用率,平均产量达11.8 t/hm²,氮肥当季回收率、农学利用率和偏生产力分别达36.9%、15.0 kg/kg和61.7 kg/kg。因此,在浙东地区籼粳杂交稻甬优1540宜推广应用氮肥减量侧深施模式,肥料可为基肥和穗肥2次施用。

In order to compare the yield and nitrogen use efficiency of Yongyou 1540 under different nitrogen reduction modes, a filed experiment was carried out in two sites representing different soil type in east Zhejiang single-season rice area in 2019. The results showed that compared with the artificial spreading fertilization treatment, the number of grains per panicle was significantly increased by the mechanized side-deep fertilizer treatment, and the average yield of rice increased by 3.0%~8.2%. Under the condition of reducing nitrogen fertilizer by 20% （192 kg/hm²）, the artificial spreading fertilization mode reduced grain yield of rice. However, the mechanized side-deep fertilizer mode could ensure grain yield and significantly increase N use efficiency. Its average yield reached 11.8 t/hm², moreover, the N recovery efficiency （NRE）, N agronomy efficiency （NAE） and N partial factor productivity （NPFP） reached 36.9%, 15.0 kg/kg and 61.7 kg/kg, respectively. Therefore, the indica-japonica hybrid rice Yongyou 1540 should be popularized and applied in the mechanized side-deep fertilizer mode with nitrogen fertilizer reduction in eastern Zhejiang, nitrogen could be used as basal and panicle fertilizer.