Influences of phosphorus application on yield traits and properties of fertilizer utilization in wheat-maize rotation system

In order to confirm the threshold level of phosphate fertilizer and improve the utilization efficiency of fertilizers in rotation system of this region for meeting peoples food demands,the field experiment was conducted to research the impacts of phosphate fertilizer on yield of crop rotation,phosphate fertilizer use efficiency,available phosphorus and nitrate nitrogen content of soil with winter wheat-summer maize rotation system as the research object.The results showed that reasonable use of phosphate fertilizer could increase the output of wheat and maile,and crop rotation system had the highest yield which was 17 620.69kg/hm2 when phosphorus application amount was 120kg/hm2.With the phosphorus application amounts increasing,phosphate fertilizer use efficiency reduced,and phosphate fertilizer use efficiency reduced of rotation system was much higher than that of wheat.The increase of phosphorus application amounts could raise rapid available phosphorus content of soil and decrease nitrate nitrogen content and accumulation of soil,while excess phosphorus application a-mounts would cause slight increase of nitrate nitrogen accumulation.Considering the factors including yield traits of crop rotation system,properties of phosphate fertilizer utilization and environmental effects of available phosphorus and nitrate nitrogen of soil,the amount of120kg/hm2 of phosphorus application could be more reasonable.