山坡地由于长期水土流失,导致土壤中营养元素严重缺乏。据测定;山坡地有机质含量不足0.4％,速效氮仅13毫克/公斤,速效磷约5毫克/公斤,速效钾28毫克/公斤,微量元素铁、锰、锌严重不足。由于长期施肥品种单一,只用碳铵或尿素, Due to long-term water and soil loss, hillsides lead to a serious lack of nutrients in the soil. According to the determination, less than 0.4% of organic matter in hillsides, only 13 mg / kg of available nitrogen, about 5 mg / kg of available phosphorus and 28 mg / kg of available potassium, the trace elements of iron, manganese and zinc are seriously underdeveloped. As a single long-term fertilization species, only ammonium bicarbonate or urea,