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Second, according to the season fertilization. Vegetables do not easily accumulate nitrates at high temperatures, and nitrates tend to accumulate at low temperatures and when the light is weak. Therefore, chemical fertilizers may be applied in summer and no fertilizers in autumn or winter.
Third, fertilization due to the ground. The soil is tested for the content of nutrient elements, and the formula is used as a guide for fertilization to achieve precise fertilization.
Fourth, early application and control of fertilization. The application of nitrogen fertilizer at the seedling stage is beneficial to the early growth of vegetables and the reduction of nitrate content. The amount of nitrogen applied per mu is controlled at 15 kg. It is best to control the nitrogen fertilizer to 15 kg. It is best to use 2/3 of the nitrogen fertilizer and organic fertilizer as the base fertilizer, and use 1/3 of the nitrogen fertilizer as the top dressing. In addition, leafy vegetables are best not to use urea when foliar topdressing, because ammonium ions in the urea contact with air easily accumulate nitrate.
Huaxian County Jingzuo Station Liu Xiuling
Fertilization method for pollution-free green vegetables
First, apply more organic fertilizer, less or no nitrate fertilizer. Nitrate nitrogen fertilizers such as calcium nitrate, ammonium nitrate or potassium nitrate are highly prone to accumulate nitrate and nitrite in vegetables. Ammonium sulfate and urea can be used instead of nitrate nitrogen fertilizer.
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