我区大青山北部农区(俗称后山地区)是我区主要商品粮基地,但由于天旱地瘦,粮食生产很不稳定。造成地瘦的原因是多方面的。如严重的风蚀现象,耕作粗放,有机肥料施用量少等等。据调查目前后山地区施肥面积不到30％,一般亩施肥量仅一千斤左右。旱坡地用量更少。过去主要依靠压青休闲办法来恢复地力。但随着播种面积的扩 The northern agricultural Daqingshan area (commonly known as the Houshan area) is the main commodity grain base in our district, but due to drought and lean food production is very unstable. The causes of leanness are many. Such as severe wind erosion phenomenon, extensive farming, organic fertilizer application and so on. According to the survey, the fertilization area in the mountain area is less than 30%, and the general amount of mu fertilizer is only about one kilogram. Droughts use less. In the past, we mainly relied on the pressure green leisure approach to restore fertility. However, with the expansion of sown area