Effects of Different Nitrogen Regimes on Soil Physico-chemical Properties and Metabolites in Rice Rhizosphere

The goal of this study is to understand how nitrogen(N)influences the yield,physico-chemical properties and soil enzyme activities and metabolites in rice rhizosphere by keeping the total N supply constant and varying the ratio of early to late growth stage fertilizer application.The results showed that soil urease,soil sucrose,available nutrients and yield were significantly higher in NP(efficient nitrogen application)than in NT(traditional nitrogen application).However,pH value showed the opposite trend.Furthermore,metabolomics analysis by GC-MS identified 7kinds of differentiallyregulated metabolites in soils,including alcohols,phenolic acids,phenols,ethers,anhydride and ketones.In conclusion,efficient nitrogen application can improve soil enzymes,soil available nutrients and yield.