The general survey of soil has been starting twenty years till now,the result show that the average quick acting potassium in farmland is 146 mg/kg in Shaanxi,the central Shaanxi plain,as the grain and soil base,is more higher than that.These phenomena has covered the seriousness of lack of potassium in Qinba mountain area,in fact,the area of lack of potassium was nearly 40% in Qinba mountain area at that time,the area of lack of potassium is nearly 80% in that area with the increase of cultivation level a...
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