Technologies of saline alkali soil amelioration in Huanghe-Huaihe-Haihe Plain-A case study on Pingyuan Experimental Plot in Northwest Shandong

Implementing integated agricultural technologies such as fresh water leaching salt to reduce salinity in plough layer,increasing organic manure to lighten salt harmness,covering farmland to reduce evaporation and so on at Pingyuan Experimental Plot in northwestern saline alkali waste land of Shandong.Reducing salinity in plough layer soil,enhancing porosity of soil,increasing moisture capacity and conservation of both moisture and soil are achieved.In 1995,the forest tree covered rate reached 21.0%,grain output reached 12.53 thousand kg/hm²,total grain output reached 18160 thousand kg,average income reached 1425 yuan(RMB),4.6,1.9,2.3,2.27 times much than those of 1988,respectively.