Combining Controlled-Release Urea and Normal Urea to Improve the Yield, Nitrogen Use Efficiency, and Grain Quality of Single Season Late japonica Rice

Controlled-release urea (CRU) is widely adopted to improve yields and nitrogen use efficiencies (NUEs) in rice. However, there are few studies on the effects of mixed application CRU normal (at different N ratios) rice yield, efficiency, grain quality. A series simplified fertilization modes (SFMs) were set up 2018–2019. with release periods 80 days 120 at ratios 7:3, 6:4, 5:5, 4:6, 3:7 applied during rice-growing season. We determined dry matter accumulation, NUEs, The SFM_80_6/4 (CRU 6:4) SFM_120_5/5 5:5) 3.69% 4.39% higher than that fractionated (FU), respectively, across 2018 2019. Combining controlled-release improved uptake rate when compared FU. SFMs processing quality appearance grains did not reduce cooking eating a one-time mode high good quality, which worthy further promotion application.