The fertilization method should be scientific. Base fertilizer*** is applied one week before planting and mixed with soil evenly. Fertilization can be chased in a furrow or a hole at a distance of 7-10 cm from the plant, and cover the soil and water in time after chasing; or flush the fertilizer with water at a certain concentration.
The application of nitrate nitrogen fertilizer is prohibited. Applying nitrate nitrogen fertilizers such as ammonium nitrate and potassium nitrate can easily accumulate nitrate in vegetables; it is not suitable to use chlorinated fertilizers, because chloride ions can reduce the starch and sugar content of vegetables, which will deteriorate the quality, reduce the yield, and cause soil compaction; try not to If ammonium bicarbonate is applied, its volatilization will burn the leaves. If necessary, it must be applied in deep furrows. When applying nitrogen fertilizer, the amount should be controlled.
Apply ecological organic fertilizer. Fertilization in the shed in winter, the best use of ecological organic fertilizer produced after fermentation of livestock and poultry manure. This kind of fertilizer can be used in the greenhouse to fix nitrogen, dissolve phosphorus and potassium. It can also decompose pesticide and chemical fertilizer residues and improve the quality of vegetable products.
The amount of micro-fertilizer should be appropriate. Although the demand for trace element fertilizers on vegetables is small, it plays a big role in vegetable metabolism. The main micro-fertilizers currently used are boron, molybdenum, zinc, and iron fertilizers. Micro-fertilizers are mostly used as base fertilizers, and can also be used for seed dressing, seed soaking or extra-root topdressing. The range between appropriate and excessive amounts of micro-fertilizers is relatively narrow, and the dosage must be accurate.
Gas and fertilizer supplements should be appropriate. Carbon dioxide is the main raw material for photosynthesis of plants. It is very necessary to properly supplement carbon dioxide gas fertilizer in the production of greenhouse vegetables. The effect of increasing production and improving quality is obvious. It is not advisable to apply diammonium phosphate, because when diammonium phosphate is applied too much, the excess ammonium nitrogen will not only affect the ground temperature, but also may cause gas damage on cloudy days. Therefore, when fertilizing greenhouse vegetables in winter, farmers should achieve balanced fertilization. When the soil in the greenhouse is already rich in phosphorus, it should not be blindly topdressed with diammonium phosphate to improve the quality of vegetables.
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