Effects of Nitrogen Fertilizer Combined Application of Straw and Manure on Easily Mineralizing Nitrogen and Microbial Biomass Nitrogen in Soil

[Objective] The field experiment were conducted to study the effects of nitrogen fertilizer combined application of straw and manure on soil easily mineralizing nitrogen in the winter wheat season.[Method] Seven treatments of no application of nitrogen fertilizer,straw and manure,nitrogen fertilizer,nitrogen fertilizer and wheat straw,nitrogen fertilizer and double wheat straw,nitrogen fertilizer,wheat straw and manure,nitrogen fertilizer,wheat and corn straw,nitrogen fertilizer,manure,wheat and corn straw were set up to study the effects of nitrogen fertilizer combined application of straw and manure on soil easily mineralizing nitrogen in the winter wheat season.[Result] Under the treatments of nitrogen fertilizer combined application of straw and manure,the amount of soil easily mineralizing nitrogen and microbial biomass nitrogen before breaking were highest in the whole winter wheat season,and decreased after breaking,and there were little increase after nitrogen topdressing.[Conclusion] Nitrogen fertilizer combined application of straw and manure could increase the content of soil mineralizing nitrogen and biological nitrogen before winter.And it was of important significance for supplying the deficiency of inorganic nitrogen in soil after returning and increasing the nitrogen utilization rate.