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通过对石棉县主要耕地土壤中钾素收入与支出情况的探讨 ,结果表明 ,1996年全县当年钾的支出为1376 6 7t,而收入仅 6 93 9t,相差 6 82 77t,亏缺率为 49 6 0 % ,同年土壤中的氮和磷则有盈余。增施钾肥后水稻可以增产 82 5kg/hm2 ;小麦的增产率则多在 16 %以上。石棉可供开发利用的钾素资源有花岗岩石粉末和秸杆两大类 ,它们每年可提供约 82 0～ 980t的钾素 (K2 O) ,可大大缓解土壤钾的亏缺
Through the discussion of the income and expenditure of potassium in soils of main cultivated land in Shimian County, the results show that in 1996, the county spent 137667 tons of potassium and the income was only 6 93 9 tons, a difference of 6 82 77 tons and a deficit rate of 49 6 0%, the same year the soil nitrogen and phosphorus have a surplus. After applying K fertilizer, paddy yield could increase 82 5kg / hm2; the yield of wheat increased more than 16%. Asbestos resources for development and utilization of potassium resources are two types of granite powder and straw, which can provide about 82 0 ~ 980t of potassium (K2 O) per year, can greatly alleviate soil potassium deficiency