不同硝、铵态氮水平配施对小白菜生长及硝酸盐累积的影响

Effects of Combined Application of Different Ratios of Nitrate-N to Ammonium-N on the Growth and Nitrate Accumulation of Chinese Cabbage

采用土培盆栽试验方法,研究了7种不同硝、铵态氮水平配施(即NO3--N/NH4+-N比为:3/1,2/1,3/2,1/1,2/3,1/2和1/3)对小白菜植株株高、株重、产量及硝酸盐含量的影响。结果表明:在试验设计的硝、铵态氮配比水平范围(3/1～1/3)内,随硝/铵态氮施用量比值的降低,小白菜植株株高、株重及产量均大体表现出先升高尔后降低的趋势;而小白菜植株硝酸盐含量则大体表现出先升高尔后降低再升高的趋势。与硝铵比3/1处理相比,硝铵比2/3处理可分别提高小白菜植株株高、株重及产量15.57%、45.05%和13.67%,同时降低菜体硝酸盐含量37.49%。故硝铵比为2/3处理比较适宜土培小白菜的生长及蔬菜体内硝酸盐含量的降低。

With the pot experiments,it was investigated that the effects of combined applications of 7 different ratios of nitrate-N to ammonium-N（i.e.the ratios of NO3--N /NH4＋-N were 3/1,2/1,3/2,1/1,2/3,1/2 and 1/3,respectively.） on plants＇ tallness,weight,yield and nitrate＇s content of Chinese Cabbage.Results showed as follows.With the decrease of NO3--N /NH4＋-N ratios in the designed range,plant＇s tallness,weight and yield of vegetable increased firstly and then decreased;while the content of nitrate in vegetable increased firstly and then decreased and finally increased.Compared with the treatment of NO3--N /NH4＋-N 3/1,the tallness,weight and yield of plant increased respectively by 15.57%,45.05% and 13.67% in treatment of NO3--N /NH4＋-N 3/2;at the same time,the content of nitrate in vegetable decreased by 37.49 %.Therefore,the ratio of NO3--N /NH4＋-N 2/3 was relatively better for the growth and the decrease of nitrate＇s content of Chinese Cabbage planted in soil.