Fixed Position Continuous Cultivation Teston Changes of Potassium in Guanmo Soil

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 K700 mg/kg, quick effective K133 mg/kg in soil, the crop in strip cultivation soil occur potassium ferterlizer expressing effect.