以甜荞麦大粒荞品种为材料，设4个钾素水平（K₂O 0、 22.5、 45和67.5 kg/hm²），通过两年田间试验，研究了钾肥用量对甜荞麦产量、 钾素吸收和利用特性的影响。结果表明，甜荞麦籽粒产量、 籽粒钾素累积量随施钾量的增加先增加后降低，在施钾量为K2O 45 kg/hm² 时达最高。通过二次曲线模拟，在施钾量为K₂O 46.2 kg/hm²（2009年）和46.3 kg/hm²（2010年）时产量达到最高。钾素生理效率、 钾素利用效率、 钾肥农学利用率、 钾肥生理利用率、 钾肥效率和钾肥利用效率均随钾肥用量的增加而下降。在本试验条件下，施K₂O 22.545 kg/hm²时，通辽市库伦旗甜荞麦可获得较高的钾肥利用率，并获得高产。

The effects of potassium (K) application rates on grain yield, K accumulation and use efficiency of buckwheat were studied by fields experiments with K₂O rates, 0, 22.5, 45 and 67.5 kg/ha. The cultivar of buckwheat (F. esculentum Moench)，Daliqiao was selected as experimental material. The results show that the grain yield and K accumulation are increased at the first and then gradually decreased with the increment of the K application rates, and the grain yield and K accumulation reach their maxima under the K fertilizer application rate of K₂O 45 kg/ha. Simulated by a quadratic curve, the grain yields of buckwheat reach their maxima under K fertilizer application rate of K₂O 46.2 kg/ha (2009) and 46.3 kg/ha (2010). The K physiology efficiency, K utilization efficiency, agronomy efficiency of K, K fertilizer physiology use efficiency, K fertilizer efficiency and K fertilizer rate of buckwheat are decreased significantly with the increment of the K application rates．In conclusion, under this field experiment conditions, the most optimal K fertilizer utilization efficiency is K₂O 22.5- 45 kg/ha in Kulun town of Tongliao.