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带状间作4年定位试验表明,增施化学K肥平均增产17.0％～20.3％,土粪基础上K肥增产时限推迟2年。连续18年小麦、玉米定位轮作试验表明,土壤K素能保证2个轮作期(每轮3年)作物K素需求,第3～6轮作期施K平均增产10.3％～30.7%,增效与试验历程呈正相关,增施土粪土壤K素平均每年亏缺135.0～335.5kg/hm~2;增施化学K肥平均每年亏缺97.4～335.7kg/hm~2;等量土粪和化学K肥配合施用年均亏缺76.5～268.0kg/hm~2。无K投入时,连续种植作物土壤速效钾年均减少2.6～17mg/kg,施土粪带回速效钾年均下降7.5mg/kg,轮作田略有提高。在土粪基础上增施化学K肥能保持和提高土壤速效钾,土壤缓效钾下降速率是速效钾的6.5～8.2倍。
The interlaboratory interlaboratory test for 4 years showed that the increase of chemical K fertilizer was increased by 17.0% ~ 20.3% on average, and that of K fertilizer was delayed by 2 years on the basis of soil manure. Continuous 18 years of wheat and corn locating rotations tests showed that soil K could ensure the demand of crop K in two rotations (three years per round), and the yield of K increased from 10.3% to 30.7% in the third to the sixth rotation, The results showed that there was a positive correlation between the K test and the experiment. The average annual K deficiency was 135.0 ~ 335.5kg / hm ~ 2. The average K fertilizer application was 97.4 ~ 335.7kg / hm ~ 2, Fertilizers with an average annual loss of 76.5 ~ 268.0kg / hm ~ 2. When no K was input, the annual available potassium in continuous cropping decreased by 2.6 ~ 17mg / kg, while the soil available for return of available potassium decreased by 7.5mg / kg and rotation of cropland increased slightly. The application of chemical K fertilizers on the basis of soil manure can maintain and increase soil available K, and the rate of soil slow-acting potassium decline is 6.5 ~ 8.2 times higher than that of available potassium.