Won't organic vegetables produce nitrite if they are kept for a long time?

In all "fresh" vegetables, the content of nitrite is very small, and the nitrite we are generally worried about comes from the nitrate accumulated in vegetables. Therefore, after leaving the soil environment, vegetables containing a lot of nitrate will become nitrite due to the influence of temperature factors such as respiration and transpiration, especially in the case of poor storage conditions and the reduction of some bacteria. People are keen to discuss whether vegetables will be poisoned by nitrite if they are eaten overnight, but they often ignore the first step, whether the vegetables bought are fresh, whether they are eaten as soon as possible and whether they are stored reasonably. Let's talk about the accumulation of nitrate in vegetables, because this is the "source" of the problem: 1. Vegetables absorb nitrate nitrogen from soil and then apply it to nitrate reductase, nitrite reductase, glutamine reductase and so on. Therefore, the nitrogen content in vegetable cultivation and fertilization is very important. Although the statement that "organic vegetables do not produce nitrite" is obviously a rumor under the blind admiration of "organic", I have carefully considered that the influence of fertilizer differences on nitrate accumulation is definitely influential. The fertilizers applied to organic vegetables are organic manure and green manure, so the amount of nitrogen absorbed by vegetables may be different from that of ordinary vegetables (the data has not been checked yet); So from the point of view of nitrogen, organic and ordinary dishes are not necessarily the same. 2. Nitrate content in vegetable growing period > late growing period or mature period; Excessive application of nitrogen fertilizer or improper use time (such as application shortly before harvest) in agricultural production leads to excessive nitrate accumulation in vegetables and food; 3, nitrate accumulation ability, usually green leafy vegetables >; Root vegetables > Chinese cabbage > pumpkin > eggplant; This is well understood, because nitrogen is an essential element for chlorophyll synthesis. In agriculture, the application of chlorophyll meter to determine the color of vegetables to reflect the nutritional status of nitrogen can indicate the immediate demand of vegetables for nitrogen, so as to correctly and reasonably apply fertilizer to adjust the growth rate of vegetables. 4. The nitrate content in the same variety of vegetables will be different due to different genotypes. Taking spinach as an example, among the three genotypes, the full wrinkle type is >; Semi-wrinkle > smooth type; 5. Nitrate in the same variety of vegetables varies with different organs and parts, usually: petiole >; Leaf > main stem > root >; Flowers > tubers > bulbs > fruits > seeds. To sum up, if you want to reduce the intake of nitrite in vegetables, organic is a "chicken rib". = = = = = = = = = = = = = = Why? 1, excessive nitrite does lead to methemoglobinemia "poisoning", but food poisoning usually occurs in infants, because there are many bacteria in infants' stomachs, and NO3- is easily reduced to NO2- by bacterial nitrate reductase, and NO2- oxidizes ferrous hemoglobin Fe2+ to Fe3+ to form methemoglobin; Moreover, children have less gastric juice, higher pH value (> 4), less secretion of reducing substances such as VC, and the hemoglobin reductase system has not yet formed, which is more likely to get sick and even lead to death. Adults and children, unless they eat nitrite directly. 2. More attention should be paid to the problem of high nitrite content in processed meat products (often added to meat to keep the color of pink powder). Nitrosamine (an N- nitroso compound) formed by nitrite and protein in the body is a certain carcinogen. If, unfortunately, your intake of vitamin C is also low (such as lack of vegetables), then the incidence of gastrointestinal cancer will be higher. 3. Another study shows that in the process of transforming nitrate into nitrite, a small amount of nitric oxide will be produced, which has a certain health care effect on dilating blood vessels, lowering blood pressure and preventing thrombosis. Think about what medicine heart patients take for sudden illness. -Nitroglycerin tablets, a truth) Therefore, it is not worth the loss to waste "vegetables" because of "nitrite".