玉米优化施氮高产高效生理机制
Mechanisms of High Maize Yield and Nitrogen Use Efficiency under Optimized Nitrogen Management
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摘要: 缺氮降低玉米产量;过量施氮并不能进一步提高玉米产量,反而降低氮素利用效率,并造成严重的环境问题。合理施氮能够保证玉米不同生育期充足的氮素吸收,有利于最大产量的获得。分析近年来国内外学者对不同供氮水平影响玉米形态和生理过程的研究,从根系发育、叶片形态和光合作用以及穗发育的角度探讨缺氮减产、过量供氮不能增产的原因,以期为合理的玉米氮肥管理以及氮高效玉米品种的选育提供理论依据。Abstract: Maize grain yield is reduced by nitrogen deficiency.Excessive nitrogen fertilizer can’t increase yield of maize,but it decreases nitrogen use efficiency and causes serious environmental problems.Reasonable nitrogen fertilization can ensure adequate nitrogen uptake at different growth stages of maize,which is beneficial to the maximum yield.Studies on effects of different nitrogen supply levels on morphological and physiological processes of maize from domestic and foreign scholars in recent years were reviewed.Reasons that nitrogen deficiency resulted production reduce and excessive nitrogen supply couldn’t increase production were discussed from root development,leaf morphology and photosynthesis,and ear development,which provided theoretical basis for rational management of nitrogen fertilizer and selection of nitrogen efficient maize varieties.
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Keywords:
- Optimized nitrogen management /
- Maize /
- Root system /
- Photosynthesis /
- Ear development
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