灌漠土K素变化的定位连作试验

Fixed Position Continuous Cultivation Teston Changes of Potassium in Guanmo Soil

连续 4a耗竭试验表明 ,带田耗 K强烈 ,缓效 K年均下降 9.4%～ 1 0 .8% ,速效 K年均下降 6.4%～1 0 .5 %。年投入化学 K素 1 87kg/ hm2 或 75 t/ hm2 土粪也不能平衡土壤 K素 ,化学 K素与土粪配合 ,且增加用量方可保持土壤 K平衡。带田土壤 K素消耗速率大于单作种植 ;带田栽培中土壤缓效 K消耗幅度大于速效 K;单作栽培中土壤速效 K消耗速率大于缓效 K。土壤缓效 K<70 0 mg/ kg,速效 K<1 3 3 mg/ kg,带田作物产生

Four year continuous depleting test was conducted. The result showed that, strip cultivation field, Patassium(K) depleting was strong. The slow effective and quick effective K year derease in 9.4%～ 10.8% and 6.4%～10.5% seperately. Puting chemical K187 kg/hm 2 or 75 t/hm 2 manure can′t balance the potassium in soil. Chemical K and manure puting to the soil at the same times and increasing amount can keep the balance of Potassium in the soil. The Potassium depleting rate in strip cultivation soil was bigger than that of one crop cultivation. The slow effective K depleting amount was bigger than that of quick effective K in strip cultivation soil. The quick effective K depleting amount was bigger than that of slow effective K in one crop cultivation soil. Slow effective K<700 mg/kg, quick effective K<133 mg/kg in soil, the crop in strip cultivation soil occur potassium ferterlizer expressing effect.