Major vegetables and fruits in Korea are grouped in 3 Categories according to the Concentration of NO3- content in edible parts of the plant. NO3- content are high in order fruit<fruits vegetables<leaf vegetables<root vegetables. NO3- content of vegetables grown in several nationalwide regions showed no meaningful significance, but among the cultivation methods there are some obvious differences, by naked land cultivation, by green house cultivation and by organic agriculture. Organic agriculture products had the lowest value of NO3- whereas green house products received the highest. As the amount of N-fertilization increases, the NO3- accumulation in the edible parts of plant organs. Finally, it discussed the utility of NO3- content in edible parts of vegetables as a indicator for proper judgement of agriculture products grown by different rate of N-fertilization