Effects of Different Nitrogen Application Rates on Dry matter Accumulation of Longjing31

[Objective] To study effects of N fertilizer application on dry matter accumulation in key growth period of Longjing31. [Method]Taking Longjing31 as test material,setting 5 kinds of N fertilizer application 0,60,120,180,210 kg / hm2,randomized block design was conducted. [Result] The results indicated that the dry matter accumulation was increased gradually in different rice growth periods. The proportion of dry matter accumulation on stems and leaves reduced when it increased on harvest organs,but too much dry matter was produced in the early growth stage due to the high nitrogen which influence the dry matter accumulation on the harvest organs in mature stage. [Conclusion] In order to improve Longjing31 yield,nitrogen application amount shouldn't exceed 180 kg / hm2.