延安南部塬区主产小麦,麦田占总耕地面积的一半。因麦田积肥时间短(从播种晚秋结束到播种小麦仅三个月),肥料少,施肥面积仅占总麦田面积的三分之一,且施肥量很低,每亩施土粪3,000斤左右,形成了历史性的小麦低产。毛主席教导我们:“肥料是植物的粮 The main wheat and wheat fields in the southern area of ​​Yan’an account for half of the total cultivated area. Due to the short time of wheat field fertilizer (from the late sowing of late sowing to sowing wheat only three months), less fertilizer, fertilization area accounts for only one third of the total wheat field area, and the amount of fertilizer is very low, Formed a historic wheat low yield. Chairman Mao taught us: ”Fertilizer is the grain of plants