Abstract: Taking Zhenghuangruo 2 as sample，topdressing nitrogen amount，using proportion and slowrelease fertilizer effects were discussed.Results showed that 180 kghm2 nitrogen application as base fertilizer increased yield by 310% than 90 kghm2 nitrogen with equal amount of phosphorus fertilizer.270 kghm2 and 225 kghm2 nitrogen application as base fertilizer had not significant difference，but had significant difference with other treatments.Optimum fertilizer application ratio of base fertilizer，jointing stage topdressing and flare opening stage topdressing was 8:4:0 with 180 kghm2 nitrogen fertilizer during whole growth period，and had the highest yield and nitrogen efficiency.Plant characters in each treatment compared with control that had varying degrees of increase by using slowrelease nitrogen fertilizers.Effects and economic efficiency were the highest with 180 kghm2 slowrelease nitrogen fertilizers during whole growth period.