[Yield increasing and water saving effect under different soil fertility improvements in wheat-corn intercropping field in Huabei Plain].

Water resource in agriculture in Huabei Plain has been increasingly reduced in recent years. In order to reduce water evaporation and improve water utilization efficiency, the field experiment on water saving under different soil fertility improvements was carried out in Huantai county, Shandong Province. The result showed that straw incorporation and organic fertilizer application could increase yield and save water clearly. Under the same amount of irrigation(250 mm), the field with all corn and wheat straw incorporation had a higher yield of 885 kg.hm-2 than the field without straw incorporation, and a higher water efficiency of 3.13. The field with all corn and wheat straw incorporation and organic fertilizer application had a higher yield of 1875 kg.hm-2 than the comparing field, with a higher water efficiency of 3.60. The field with wheat straw incorporation had a higher yield of 675 kg.hm-2 than the comparing field, with a higher water efficiency of 3.24. The field with wheat straw incorporation and organic fertilizer application had a higher yield of 1200 kg.hm-2 than the comparing field, with a higher water efficiency of 3.28.