First, the application of a single fertilizer species. At present, the fertilization of vegetable farmers is dominated by nitrogen fertilizers, while phosphorus, potash and trace fertilizers are ignored. Due to the excessive application of nitrogenous fertilizer, nitrogen fertilizer is excessively wasted; it is also easy for the soil to produce salt concentration barriers; the disease is aggravated. At the same time, due to partial application of nitrogen fertilizer, vegetables showed various symptoms of nutrient deficiency, resulting in reduced yield and quality. Second, partial application of chemical fertilizers, understanding and improper application of organic fertilizer. Some vegetable farmers believe that the application of chemical fertilizers is convenient, simple, and trouble-free, while the organic fertilizers are troublesome and dirty. Therefore, applying chemical fertilizers to some extent reduces the organic matter of the soil and changes the structure of the soil, affecting the yield and quality of vegetables. Some vegetable farmers also believe that organic fertilizer is very important in the production of vegetables, but it is often improper fertilization, showing two aspects: (1) The application of unripe organic fertilizer to vegetable plots causes toxic gases in greenhouses (greenhouses) that affect the growth of vegetables; (b) It is a lack of understanding of the fatness of organic fertilizers. In general, cow dung and pig manure should not be used as a base fertilizer in protected cultivation. Sheep dung and horse dung are acceptable. Sheep manure and horse dung can be used as young fertilizer to prevent burning roots. Third, improper dressing time. The absorption of fertilizers in different developmental stages of vegetables is different, and it must be applied as required. The application is too early, and it is easily absorbed by soil particles. It is lost by the water and causes waste. It is not enough to meet the needs of vegetable growth. Fourth, pay attention to and abuse of foliar fertilizer, do not pay attention to basal fertilizer and top dressing. At present, there are a lot of foliar fertilizers on the market. After the vegetable growers spray vegetables, the yield is very obvious. Therefore, the base fertilizer is also applied less or not. The top dressing is not chased, and only the foliar spray is used. In fact, the foliar fertilizer provides very few nutrients, and the effect of foliar fertilizer mainly relies on regulating the metabolism in the plant and absorbing nutrients from the soil. The soil is the root of the plant and must pay attention to the nutrient supply of the soil. Fifth, do not understand the characteristics of chemical fertilizers, improper use. Before using a fertilizer, you must first master its characteristics and then use it according to the characteristics. Such as urea in the ground temperature below 15 °C is not easy to transform, can not be effectively absorbed by vegetables; nitrate nitrogen fertilizer easily wet by water, should not be applied in low-lying land and aquatic vegetables; avoid chlorine vegetables should not be excessive use of ammonium chloride Potassium chloride.
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