Effects of Nitrogen Fertilizer on Yield and Nitrogen Efficiency of Winter Wheat under Maize Straw Returning

Objective:The purpose of this experiment was to investigate the effects of straw returning plus nitrogen fertilizer on wheat yield and nitrogen efficiency,to provide theoretical basis for crop planting and moisture conser vation in Linyi City.Method:Winter wheat named Jimai22 was used as the test material,the field experiments in cluded six treatments:straw returning + N 0kg/hm2(T1),straw returning + N 90kg/hm2(T2),straw returning + N 180kg/hm2(T3),straw returning + N 270kg/hm2(T5),straw returning + N 360kg/hm2(T6) and N 180kg/hm2(T4) to study the effects of nitrogen fertilizer on yield and nitrogen efficiency of winter wheat under maize straw re turning.Result:With straw returning and nitrogen fertilization,winter wheat grain yield was significantly higher than that of N fertilizer,the increasing rate was 18.48%,when the nitrogen fertilization was 270kg/hm2,the winter wheat yield was the highest,up to 8 410kg/hm2.Nitrogen fertilizer use efficiency、nitrogen use efficiency and agro nomic nitrogen use efficiency in straw-return and nitrogen fertilization treatments were higher than those of N treatment by 7.6%、6.7kg/kg and 3.6kg/kg.Conclusion:Comprehensive consideration,nitrogen amount should be con trolled at 180~270kg/hm2 in Linyi City.