Non-iodized salt pickles will produce nitrite. The main reason is that vegetables in the growth process absorbed soil, water, nitrogen fertilizer and other factors itself will contain nitrate, nitrate belongs to a part of the nitrogen cycle, naturally occurring in the soil and the environment. Vegetables in the fermentation process by the role of some bacteria can be reduced to nitrite. With the prolongation of pickling time nitrite content will produce different changes, from the test data show that the pickle pickling time from the 2nd day to the 19th day of nitrite content is higher, pickling to the 20th day of nitrite content is lower, from the data point of view of the pickle pickling time the longer the nitrite content is lower. Therefore pickled sauerkraut, whether you put salt pickling, vegetables in the fermentation process will also produce nitrite.