| Cite this article: | 王英,刘景辉,武俊英,等.控释氮肥减量对糜子干物质积累、光合特性及产量的影响[J].灌溉排水学报,2023,():-. |
| WANG Ying,LIU Jinghui,WU Junying,et al.控释氮肥减量对糜子干物质积累、光合特性及产量的影响[J].灌溉排水学报,2023,():-. |
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| Effect of controlled-release N fertilizer reduction on dry matter accumulation, photosynthetic characteristics and yield of millets |
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WANG Ying1, LIU Jinghui1, WU Junying2, MI Junzheng1, SUN Mengyuan1, ZHANG Lanying1, FENG Xueying1
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1.College of Agronomy,Inner Mongolia Agricultural University;2.Vocational and Technical College,Inner Mongolia Agricultural University,Salaqi Town
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| Abstract: |
| To address the problem of single type of N fertilizer and low fertilizer utilization rate of millets in the dry crop area of Loess Plateau, this experiment set up controlled-release N fertilizer N 120kg/hm2 (T1), 108kg/hm2 (T2), 96kg/hm2 (T3), 84kg/hm2 (T4), 72kg/hm2 (T5) and no fertilizer (T0) as the control. T5) and no fertilizer (T0) to investigate the changes of dry matter accumulation distribution, photosynthetic characteristics of flag leaf, SPAD, NBI and yield of millets after different N fertilizer treatments, in order to provide theoretical basis and technical support for the application of controlled-release N fertilizer in millets production. The results showed that the application of nitrogen fertilizer significantly increased the dry matter accumulation and photosynthetic capacity of flag leaf at all fertility stages of millets. Compared with the application of urea, the equal amount of controlled-release N fertilizer increased the dry matter accumulation in the middle and late stages of millets by 4.44%-8.77%, and increased the proportion of dry matter allocated to the spike at maturity by 1.58%-2.75%, and the results were basically consistent between years. The application of controlled-release nitrogen fertilizer increased the chlorophyll content and nitrogen balance index of millets flag leaves by 2.19%~5.05% and 2.66%~8.34%, respectively, compared with the equivalent amount of urea, and increased the net photosynthetic rate, stomatal conductance and transpiration rate of millets at the filling stage by 3.90%, 6.40% and 4.20%, respectively, and reduced the intercellular CO2 concentration by 4.45% on average in both years. The dry matter accumulation and photosynthetic performance of millets decreased with the reduction of controlled-release N fertilizer and was significantly lower than that of TN treatment at 20% N reduction. Millets flag leaf SPAD and NBI showed correlations with dry matter accumulation, net photosynthetic rate and yield, with NBI showing highly significant positive correlations with yield at both the nodulation and maturity stages and having the potential to predict millets yield. Application of equal amount of controlled-release N fertilizer significantly increased millets yield by 4.42%, and the difference between millets yield and TN was not significant at 10%-20% reduction of controlled-release N fertilizer, and significantly reduced by 3.19%-5.23% at 30%-40% reduction of millets yield. In conclusion, the application of controlled-release N fertilizer in millets production in the hilly areas of Loess Plateau showed higher potential for yield increase and N reduction than urea, and a single base application of controlled-release N fertilizer was beneficial to improve the yield level of millets while increasing N fertilizer utilization efficiency. |
| Key words: Dry matter accumulation distribution; Nitrogen balance index; Net photosynthetic rate; Chlorophyll content |
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