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作 者 ：孙传范;戴廷波;曹卫星

期 刊 ：植物营养与肥料学报 2003年 9卷 1期 页码：33-38

关键词：小麦；增铵营养；施氮水平；氮素利用；

Keywords:wheat, EAN, N level, N utilization,

摘 要 ：采用盆栽试验,研究了不同施氮水平下小麦生长、氮素积累对不同形态氮营养的反应差异。结果表明,中氮水平下增铵营养(NH₄NO₃+DCD)处理的小麦生长具有明显的优势,表现为干物重、氮积累量增加,单株叶面积提高、硝酸还原酶活性较高,最终子粒产量最高。氮形态对生育早期植株的形态特征、开花期旗叶光合速率及成熟期器官内物质分配比例的影响较小。低氮和高氮下增铵营养不同程度地抑制了小麦生长,降低了氮素利用效率。增铵营养显著减少了土壤中的氮淋溶,但氮淋溶量受施氮量的影响更为显著。

Abstract:Pot culture experiments were conducted to investigate the effects of different nitrogen forms on the growth and nitrogen accumulation in wheat plant under different N levels (0.05, 0.15, 0.30 g/kg) The results showed that dry weight of total plant, grain yield, nitrogen uptake, leaf area and NRA were significantly enhanced by Enhanced Ammonium Nutrition (EAN) treatment (NH₄NO₃+DCD) under medium nitrogen level (0.15g/kg) There were no apparent effects of EAN on wheat growth of early stage, net photosynthesis of flag leaf at anthesis and dry matter distribution at maturity EAN under low and high level inhibited growth and nitrogen use of wheat due to the proportional increase in uptake and assimilation of inorganic N as ammonium KNO₃ treatment under low level (0.05 g/kg) got the highest nitrogen utilization efficiency Nitrogen leaching was reduced significantly with EAN, but it increased more significantly with N level The results indicate that EAN, under suitable nitrogen level, favors wheat growth, yield and nitrogen utilization

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