Humic acid was extracted from paddy soil, and was characterized by physical and chemical methods.
从土壤中提取腐殖酸样品，并用物理和化学等方法对其进行了表征。
2
The effect of humic acids on fixation and release of potassium in soil was accomplished by dissolving K-bearing minerals or blocking interlayers and adsorbing k.
腐殖酸对土壤钾素释放和固定的影响是通过对含钾矿物的溶解和层间堵塞以及对钾素的吸附作用实现的。
3
The herbaceous peat of mesic and medium—ashes is mainly used for the nutrition soil, nutrition—bowl, fuel, extracting humic acid, and made into humic fertilizer.