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在河西灌漠土上连续22年进行的土壤肥力及施肥效应长期定位试验,以及连续4年的小麦、玉米作物定位连作试验表明:不施钾条件下种植小麦/玉米带田,土壤速效钾(K)年均减少10.8~17.8 m g/kg,缓效钾(K)年均减少101~116 m g/kg;连续单施有机肥75 t/hm2,速效钾、缓效钾年均减少8 m g/kg和48.3~70.3 m g/kg;连施化学钾素(K2O)62~187 kg/hm2时,速效钾年均减少2~12.8 m g/kg,缓效钾年均减少24.3~77.5 m g/kg;有机肥和化学钾肥配合施用,缓效钾年均减少6.8~67.3 m g/kg,速效钾当年减少幅度很小,高钾处理土壤速效钾还略有提高。
Long-term positioning experiment on soil fertility and fertilizer effect conducted for 22 consecutive years in Hexi desertified soil and continuous cropping and positioning experiments on wheat and maize for 4 consecutive years showed that under the condition of wheat / corn field without potassium application, available potassium ( K) decreased by 10.8 ~ 17.8 mg / kg and K ~ (-1) decreased by 101 ~ 116 mg / kg with an annual average of 75 t / hm2, kg and 48.3 ~ 70.3 mg / kg, respectively; with the K2O application of 62 ~ 187 kg / hm2, the available potassium decreased by 2 ~ 12.8 mg / kg and the slow potassium decreased by 24.3 ~ 77.5 mg / kg; Combined application of organic fertilizer and chemical potassium fertilizer, the slow-acting potassium decreased by 6.8-67.3 mg / kg annually, while the decrease of available potassium in the current year was small, and the available potassium in soil treated with high-potassium increased slightly.