Effect on yield and quality of radish by applying nitrogen in different grow-stage

By the {3,2} single grille saturation design applying the total nitrogen (N) 225 kg/hm~2 in different grow-stage, the paper sets up the nitrogen fertilizer field experiment of radish to build the maths model with proportion. By analysis, a good dispensatory proportion of nitrogen fertilizer is Z_1=0.4567, Z_2=0.2642, and Z_3=0.2792, the nitrogen fertilizer structure in different grow-stage amount of nitrogen is Z_1'=102.8 kg/hm~2, Z_2'=59.4 kg/hm~2 and Z_3'=62.8 kg/hm~2 and the expectant output is y =122.657 t/hm~2. The influence of different nitrogen fertilizer application period on dissolvable soild, total sugar, revertant sugar and titration acidity of radish is not obvious, and evident on vitamin C content.