三江平原自开发以来单一农业生产,土壤肥力衰退,单产下降,低产耕地的培肥成为三江平原开发的重要内容之一。“七五”期间建立人工草地示范区,利用牧草地上部养畜,粪肥回田,根系改良土壤培肥地力以促进农区牧业发展,实现农牧并举。“七五”期间建立的示范区初步得到了经济效益、社会效益和生态效益。 Since the development of the Sanjiang Plain, single agricultural production, soil fertility decline, yield decline, low-yielding cultivated land fertilization has become an important part of the development of the Sanjiang Plain. During the “Seventh Five-Year Plan” period, a demonstration area of ​​artificial grassland will be set up. With the support of livestock raising and manure in the upper part of the grassland, the root system will improve soil fertility in order to promote the development of animal husbandry in rural areas and realize the simultaneous development of agriculture and animal husbandry. The demonstration area set up during the “Seventh Five-Year Plan” period has initially obtained economic benefits, social benefits and ecological benefits.