石棉县耕地土壤的钾素平衡问题探讨

Discussion on the Balance of Potassium in Soil of Cultivated Land in Shimian County

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) 。

Based on the discussion on the ingathering and disbursing of Potassium in main soil of cultivated land in Shimian County, the result indicats that the ingathering of Potassium was 1376 67t in 1996, meantime the disbursing was 693 9t, the discrepancy was 682 77t, the ratio of waning was 49 60%, at the same time the nitrogen and the phosphorus were surplus. The paddy yielded 825kg/hm 2 after adding to Potassium fertilizer; the production of wheat increased above 16%. There are two kinds of resources in Potassium, one is the powder of granite and the other is straw, which can provide with 820t to 980t Potassium (K 2O) to greatly relieve the waning of Potassium.