论文部分内容阅读
以番茄、黄瓜、甘蓝和小白菜为材料,用营养液栽培法研究了不同硝酸态氮(NO_3-N)与亚硝酸态氮(NO_2-N)配比(NO_3-N:NO_2-N分别为12:0,8:4,4:8,0:12mM),不同pH值(pH7、6、5三组),对蔬菜生长和NO_3-N,NO_2-N、游离氨基酸累积的影响。结果表明,这四种蔬菜明显地分为两类:番茄、小白菜易感受NO_2-N的危害,并且有随溶液中pH值的下降而受害加剧的趋势;而黄瓜和甘蓝则对NO_2-N具有较强的耐受性。供试植株内NO_3-N与NO_2-N的累积量,随营养液中硝酸盐及亚硝酸盐的浓度增大而增加。叶莱较果菜易于累积NO_3-N与NO_2-N。大量施用亚硝酸态氮肥,会导致蔬菜内个别氨基酸的异常积累,引起氮素代谢的紊乱。番茄积累最多的是苏氨酸,小白菜为天门冬氨酸。
The effects of different nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) ratio (NO 3 -N: NO 2 -N) were studied by using nutrient solution culture method with tomato, cucumber, cabbage and Chinese cabbage as materials. 12: 0,8: 4, 4: 8,0: 12mM), different pH values (pH7,6,5 three groups) on the growth of vegetables and the accumulation of NO3-N, NO2-N and free amino acids. The results showed that these four kinds of vegetables were apparently divided into two categories: tomato and cabbage were susceptible to the damage of NO_2-N and had the tendency to aggravate with the decrease of pH value in solution; while cucumber and cabbage did not affect NO_2-N Has a strong tolerance. The accumulation amount of NO_3-N and NO_2-N in the tested plants increased with the concentration of nitrate and nitrite in the nutrient solution. Yelei is more likely to accumulate NO_3-N and NO_2-N than fruit vegetables. Nitrite nitrogen fertilizer in large quantities, will lead to abnormal accumulation of individual amino acids in vegetables, causing nitrogen metabolism disorders. Tomato accumulation is the most threonine, asparagine cabbage.