1, a large number of organic fertilizer applied in successive years. In the production of pollution-free vegetables, there is a misunderstanding in understanding that only vegetables that are fed with organic fertilizer are safe and of high quality. As a result, growers heavily applied organic fertilizers and even applied them excessively. Do not know, organic fertilizer compared with chemical fertilizers, only nutrients in organic fertilizers exist in an organic state, applied to the soil is not easy to be immediately absorbed and used by vegetables, only through transformation and decomposition, organic nutrients into ionic nutrients can only play a fertilizer effect. Since the ionic nutrients are the main form of crop root absorption, from the perspective of crop nutrient absorption, there is no essential difference between applying organic fertilizer and chemical fertilizer, but the effect of organic fertilizer is slow and fertilizer efficiency is fast. In addition, we know that nitrogen fertilizers (including organic fertilizers and chemical fertilizers) applied to the soil will be eventually decomposed and converted to nitrate nitrogen in dry soils where the soil is well ventilated and where oxygen is sufficient. Therefore, reducing nitrate content in the soil by applying a large amount of organic fertilizer to reduce the nitrate content in vegetables is not feasible. A large number of organic fertilizers (especially chicken manure and pig manure) with high nitrogen content in vegetable fields will also cause excessive nitrate levels in vegetables.
2, do not apply nitrate nitrogen fertilizer. Nitrate-containing nitrogen fertilizers include ammonium nitrate and calcium nitrate. The nitrogen in these fertilizers exists as nitrate. In the production of pollution-free vegetables, the application amount is minimal. Because people generally believe that the application of nitrate nitrogen fertilizer will cause the accumulation of nitrate in vegetables. This is also a wrong understanding. From the perspective of soil and fertilizer, all nitrogen fertilizers, including nitrate nitrogen fertilizers, ammonium nitrogen fertilizers, amide nitrogen fertilizers, organic fertilizers, etc., are applied to the vegetable fields and are converted and decomposed. The available nitrogen in the soil is in the form of nitrate nitrogen, which is eventually absorbed by the crop roots in the form of nitrate nitrogen. Therefore, nitrate nitrogen fertilizer is not the main reason causing excessive nitrate content in vegetables. It is difficult to understand that no nitrate fertilizer is applied.
3. Organic Fertilizer instead of Chemical Fertilizer: Because of the comprehensive nutrition of organic fertilizers, it can be used to improve the soil after it is applied to the soil to make the soil loose and breathable. It has the function of keeping moisture, increasing temperature, and maintaining acid-base balance in vegetable fields. The fertilizer has only a single nutrient and can easily cause soil compaction and soil acid-base imbalance after being applied to the soil. Therefore, growers have a tendency to use organic fertilizers instead of fertilizers in their production. However, due to the slow fertilizer efficiency of organic fertilizer, it may be insufficient for fertilizer supply during the critical period of fertilizer requirements, resulting in lack of fertilizer, causing poor vegetable growth and yield decline. Fertilizers are fast and can be used as fertilizer for a few days after being applied to the soil. Therefore, in the current situation of pursuing high yields, using organic fertilizer instead of chemical fertilizer is unscientific and unreasonable.
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