不同氮肥施用期对萝卜经济产量与品质的影响

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

应用{3,2}单形格子饱和设计,在施氮总量为N225kg/hm2条件下,设置萝卜氮肥分期施用田间试验,拟建萝卜氮肥分期施用比例的数学模型。通过频率分析寻优,获得较佳施氮分配比例为Z1=0 4567,Z2=0 2642,Z3=0 2792,即基肥重,前、后期追肥平稳的结构,其对应的施肥量为Z1'=102 8kg/hm2,Z2'=59 4kg/hm2,Z3'=62 8kg/hm2,期望较高商品产量y =122 657t/hm2。不同氮肥施用期对萝卜可溶性固形物、总糖、还原糖和可滴定酸度的影响不明显,但对维生素C含量的影响则较大。

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.