| 摘要: |
| 分别以纯水和自来水为生长介质对莴笋和菠菜进行水培试验,以揭示不同氮素形态及配比对蔬菜生长和品质的影响。结果表明,以纯水为水培水源,NO3--N∶NH4+-N为1∶1或单独供应NH4+-N,对作物生长均有一定程度的抑制作用,而以后者的生长量最低。以自来水作水培介质时,以NO3--N为唯一氮源预培养一段时间后,再提高营养液中NH4+-N比例,有利于蔬菜的生长发育及硝酸盐含量的降低,使莴笋维生素C含量也有所降低,菠菜则无明显变化。当植物生长量较大时,尿素作水培氮源不能满足作物对氮素的需求。 |
| 关键词: 水培试验，氮素形态，氨毒害，硝酸盐累积，蔬菜栽培 |
| DOI： |
| 分类号:S158.3 |
| 基金项目:陕西省农业发展办公室和杨凌农业科技开发基金资助项目(95J-42) |
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| Effect of Different Nitrogeous Forms and NO3-to NH4+ Ratio on Growth and Quality of Vegetables |
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| Abstract: |
| In order to investigate the effect of different nitrogen forms and NO3- to
NH4+ ratio on growth and quality of vegetables, solution culture experiment in which the
distilled water and the running water were supplied as growth medium respectively was
conducted. The results are as follows with the distilled water as growth medium, vegetable growth is inhibited to some extent when NO3--N:NH4+-N ratio is 1∶1 or NH4+-N
is supplied solely,when NH4+-N is only nitrogen source, the vegetable growth amount is
least.When the running water in which the small amount of nitrate existes is supplied as
culture medium, at first the vegetable was cultured for some time only NO3--N as nitrogen source, then increasing the NH4+-N percentage in nutrient solution,which favours
growth and development of vegetables, in the meantime the nitrate content in vegetables
decreased, vitamin C content in lettuce decreased and vitamin C in spinaches didnt show
apparently change. When the vegetable growth amount is relatively large, the nitrogen
source mainly supplied by urea cant meet the demand of vegetable to nitrogen. |
| Key words: hydroponics experiment,nitrogeous forms,ammonia toxication,nitrate accumulation,vegetable culture, |
