Lee S K，Kader A A．Preharvest and postharvest factorsinfluencing vitamin C content of horticultural crops [J]．Postharvest Biology and Technology，2000，20:207-220．
[2]
Gangolli S D，van den Brandt P，Feron V J，et al．Nitrate，nitrite and N-nitroso compounds[J]．European Journal of Pharmacology，Environmental Toxicology and Pharmacology，1994，292(1):1-38．
[3]
Eichholzer M，Gutzwiller F．Dietary nitrates，nitrites，andN-Nitroso compounds and cancer risk:a review of the epidemiologic evidence [J]．Nutrition Review，1998，56(4):95-105．
[4]
Wolff I A，Wasserman A E．Nitrates，nitrites，and nitrosamines[J]．Science，1972，177(4043):15-19．
[5]
Santamaria P．Nitrate in vegetables:toxicity，content，intake and EC regulation [J]．Journal of the Science of Food and Agriculture，2006，86:10-17．
[6]
Dem ar J，Osvald J，Vodnik D．The effect of light-dependent application of nitrate on the growth of aeroponically grown lettuce (Lactuca sativa L．) [J]．Journal of the American Society for Horticultural Science，2004，129(4):570-575．
Mozafar A．Decreasing the NO3－ and increasing the vitaminC contents in spinach by a nitrogen deprivation method[J]．Plant Foods for Human Nutrition，1996，49:155 －162．
[10]
Liu W K，Yang Q C．Short-term treatment with hydroponic solutions containing osmotic ions and ammonium molybdate decreased nitrate concentration in lettuce [J]．Acta Agriculturae Scandinavica，Section B-Soil ＆ Plant Science，2011，61(5):391-394．
