At present, red fertilization is widely used in greenhouse cultivation and open field vegetables. Because the fertility of flushing and fertilizing is fast, it usually takes two or three days after being flushed, and it may be effective when it is slow for three or five days, which is reflected in the obvious changes in leaf color and plant height, which is in line with the enthusiasm of some eager growers. Fertilization, as the name implies, is the application method of water-fertilizer. Generally, it is used as a top-dressing supplement to provide nutrients during the period of rapid crop growth. Since it is supplemental fertilization, it cannot replace basic fertilization methods such as basal fertilization. Fertilizer can be used as a water-soluble fertilizer because it is easy to apply fertilizer. Many farmers are accustomed to using granular solid compound fertilizers such as urea, potassium chloride, etc. in the bucket and even sprinkle it directly on the head of the canal. When the water reaches the root of the crop, it is unclear whether the fertilizer granules are dissolved. Some people even smash and crush the granular high-concentration compound fertilizer, and some people use uncured insoluble solid organic fertilizers or microbial preparations as fertilizers, which are not appropriate.

Only water-soluble fertilizers can be applied with nitrogen fertilizer, commonly used urea, ammonia, ammonium sulfate and ammonium nitrate flushing; potash, potassium chloride and potassium sulfate can be applied flushing, potassium nitrate can also be used. In phosphate fertilizers, even if it is water-soluble phosphorus monoammonium phosphate and diammonium phosphate, do not flush, because the phosphate fertilizer after the dissolution of poor mobility, easily fixed, can not be infiltrated into the root layer with water. Phosphate fertilizer is best applied by layering it into the soil, only in order to improve its utilization. The use of nitrogen fertilizers to reduce the number of times without cost, blindly pursuing large amounts of nitrogen fertilizer will not only cause waste of nutrients, but will also lead to leggy and declining quality of vegetables. At the same time, it will also pollute the water quality and exacerbate soil salinization. In vegetable cultivation, the amount of pure nitrogen used for each fertilization should be controlled at 2 to 3 kg/mu, especially nitrated nitrogen should be controlled at 2 to 3 kg/mu, with a limited number of potassium fertilizers (potassium oxide). At 2 to 4 kg/mu. Fertilization in the whole growing period is generally twice as appropriate.

Fertilizer application should be carried out in a timely manner in the fast growing period of crops. For example, if the vegetables are in the full fruit period, after picking fruits, the Chinese cabbage is in the filling period, autumn vegetables generally choose the temperature drop period, at this time the soil mineralization declines. , The best nutritional supplement.

The irrigation and irrigation should be controlled under the mode of flood irrigation to prevent flood irrigation. When canal irrigation, the depth of the ditch and the amount of water are suitable to prevent the nutrients dissolved in the water from losing water. Some people break down granular high-concentration compound fertilizers and crush them; others use unprocessed and insoluble solid organic fertilizers or microbial preparations as fertilizers. These are not appropriate.

In short, in principle, we must grasp the following points: Fertilization should be applied in a timely and appropriate manner, mainly for top dressing of vegetable cultivation, mainly topdressing nitrogen and potassium. There are four types of fertilizers that should not be used for flushing: one is not flushed with phosphorus; the other is not flushed with granular compound fertilizer; three is not flushed with solid organic fertilizer; and four is not flushed with microbial preparations or fertilizers.

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