地处河西走廊中部的山丹地区,严寒的冬季长达四、五个月之久,土壤冻层深达一米左右。此期按一般方法积肥受低温的影响,难以发酵腐熟,来春多为生粪上地,非但不能充分发挥肥效,且易引起病虫蔓延,草荒加剧。运用冬季地温高于气温的原理, Located in the central Hexi Corridor Shandan area, the cold winter as long as four or five months long, the soil frozen up to about one meter deep. This period by the general method of product fertilizer by the impact of low temperature, difficult to ferment maturity, spring is mostly raw dung, not only can not give full play to fertilizer, and easily lead to the spread of pests and diseases, aggravated grassland. Using the principle that winter temperature is higher than temperature,