施钾对寒地水稻氮肥吸收和利用效率的影响

摘要

The effect of K fertilizer application on the N fertilizer absorption and utilization of Kongyul31 were studied. The application of K fertilizer could increase the yield of rice. When increasing the amount of K fertilizer, the relative content of N in rice decreased while the absolute absorption amour in it increasd, the relative amount of N in rice seed decreased, and apparent recovery- efficiency, partial factor productivity, agronomic efficiency and physiological efficiency of N fertilizer all increased. These resuts showed that K fertilizer application could promote the absorption and utilization of N fertilizer in rice.The optimal K fertilizer application amount(K2O) under this experimental condition should be 90.0 kg/bm2.%以粳稻品种空育131为材料,研究不同钾肥用量下水稻对氮肥吸收和利用效率的响应,为寒地水稻生产的合理施肥提供参考.结果表明,施钾可以提高水稻产量,且随施用量增加,水稻体内氮素相对含量降低,但绝对吸收量增加,稻谷中氮占全株比重下降,氮肥利用率、氮肥偏生产力、氮肥农学效率、氮肥生理利用率均呈增加趋势,施钾有利于促进水稻对氮素的吸收和氮肥利用效率的提高,试验条件下以全生育期90.0kg/hm2 K2O的施用量较佳.