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Grain yield and nitrogen use efficiency of various modern rice cultivars grown at different nitrogen levels
- Li, Xiaokun, Xu, Zhengwei, Guo, Chen, Ren, Tao, Cong, Rihuan, Lu, Jianwei
- Journal of plant nutrition 2017 v.40 no.8 pp. 1125-1132
- cultivars, field experimentation, grain yield, nitrogen, nutrient use efficiency, planting, rice
- Field trials were conducted to study the responses of grain yield and nitrogen (N) use efficiency at five input rates (N ₀, N ₈₂.₅, N ₁₆₅, N ₂₄₇.₅, and N ₃₃₀ kg ha ⁻¹) in a set of nine of the most representative rice cultivars. Grain yields of rice across the nine cultivars were increased significantly by N level. All the cultivars contained a significant linear plus plateau or quadratic relationship between N levels and grain yields.The minimum yields (means of 2 years) at N ₀, N ₈₂.₅, N ₁₆₅, N ₂₄₇.₅, and N ₃₃₀ level all occurred in No. 2 cultivar. Compared with the grain yield of No. 2 at different N levels, those of the maximum cultivars increased by 37.1 (No. 8), 39.1 (No. 7), 48.4 (No.3), 43.3 (No. 4), and 43.9% (No. 3), respectively. In 2011, the highest average apparent nitrogen recovery efficiency (ANRE) in grain of the 4 N levels occurred in No. 3 cultivar (45.9%), followed by No. 4, No. 6, and No. 1, and the highest average agronomic efficiency (AE) in grain of the 4 N levels occurred in No. 9 cultivar [29.0 kg (kg N) ⁻¹], followed by No. 3, No. 1, and No. 4. For the second-season planting, the highest average ANRE occurred in No. 4 cultivar (28.4%), followed by No. 3, No. 5, and No. 6, and the highest average AE occurred in No. 5 cultivar [18.1 kg (kg N) ⁻¹], followed by No. 4, No. 3, and No. 7. Overall, No. 3 and No. 4 cultivars were the ideal ones that not only increased the grain yield but also improved the N use efficiency.