不同施氮水平对南方早稻氮素吸收利用及其产量和品质的影响

 在大田不同施氮条件下,研究了3个水稻品种的氮素吸收利用效率及其对产量和品质的影响。结果表明,施氮量增加,水稻氮素积累总量增加,而氮素的生产效率和收获指数下降。相同施氮量条件下提高穗肥比率,氮素积累量及其回收效率和运转效率增加,而氮素生产效率下降。不同施氮条件下水稻氮素吸收利用效率的变化对产量和品质性状产生重要影响,稻米蛋白质含量随氮素积累量增加而显著增加,随氮素生产效率提高而极显著下降;垩白米率及面积随氮素收获指数增加而显著提高。穗数随氮素积累量增加而显著增加,随氮素收获指数和氮素生产效率增加而显著下降;结

Nitrogen Uptake and Utilization Under Different Nitrogen Management and Influence on Grain Yield and Quality in Rice

Field experiments were conducted to study N uptake and utilization under different N rates and panicle fertilizerdistribution ratios (PFDR) and influence on grain yield and quality in three rice varieties. Results showed that high N rate increasedtotal N accumulation and reduced N production efficiency and N harvest index. Under the same N rate, greater PFDR increasedtotal N accumulation, N recovery efficiency, N transportation efficiency and decreased N production efficiency. Changes of Nuptake and utilization under different N management have an important influence on grain yield and quality. Increase of Naccumulation increased protein content in grains and effective panicles, but reduced seed setting rate. N dry matter productionefficiency increased with increase of seed setting rate, protein contents in grains and effective panicles reduced. N harvest indexincreased and chalky rice ratio and area enhanced, and effective panicles reduced.