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以4个不同类型水稻品种为材料,设置3种铵硝配比处理和2种水分处理,研究了不同形态氮肥和抽穗期土壤水分对水稻氮素吸收利用的影响。结果表明,水稻各生育时期的植株氮素积累量和氮肥回收效率均随氮肥中铵态氮比例的降低而降低;与抽穗期土壤水势为0 kPa的处理相比,适度水分胁迫(土壤水势-25 kPa)可提高产量、收获指数、各生育时期的植株氮素积累量及氮肥回收效率,但是降低了氮素干物质生产效率和氮肥农艺效率;在适度水分胁迫下适当增硝(铵硝配比50∶50)能进一步提高水稻产量和收获指数,还有利于提高氮素稻谷生产效率和氮肥农艺效率。
Four different types of rice varieties were used as materials to set up three kinds of ammonium nitrate treatments and two kinds of water treatments to study the effects of different forms of nitrogen fertilizer and heading stage on nitrogen uptake and utilization of rice. The results showed that the N accumulation and N recovery efficiency of rice plants decreased with the decrease of the proportion of ammonium nitrogen in the nitrogenous fertilizers. Compared with the treatment of 0 kPa at the heading stage, the moderate water stress (soil water potential - 25 kPa) could increase yield, harvest index, nitrogen accumulation in plant and nitrogen recovery efficiency in each growth period, but reduced nitrogen production efficiency and agronomic efficiency of nitrogen fertilizer. Appropriate increase of nitrate under moderate water stress Than 50:50) can further improve rice yield and harvest index, but also help to improve nitrogen rice production efficiency and nitrogen agronomic efficiency.