Second, the organic fertilizer should be fully cooked. Unfertilized organic fertilizers often carry germs and eggs, and some can be passed on to vegetables, causing harm. In addition, if the organic fertilizer is re-cooked in the greenhouse, it will produce ammonia and "burn" the seedlings. Therefore, the organic fertilizer should be fully decomposed and then applied.
Third, we must pay attention to fertilization methods. The base fertilizer is preferably applied a week before planting and mixed evenly with the soil. Topdressing can be chased or chased at a distance of 7 cm to 10 cm from the plant. After the chase, the soil will be covered and watered in time. The fertilizer can also be applied with water at a certain concentration. It is not allowed to directly spread the fertilizer, especially the nitrogen fertilizer, on the ground or Plants, so as not to cause fat loss or "burn" vegetables.
Fourth, the root dressing should be timely. First, when the vegetable nutrient supply is insufficient during the peak period of vegetable fertilizer, and the root absorption capacity is weakened in the later stage of vegetable growth. The top dressing should be carried out on a cloudy day or in the evening. Spray the fertilizer on the back of the new leaves and leaves as much as possible to facilitate the absorption of the vegetables. Foliar fertilization should be based on the nutritional characteristics of vegetables, the symptoms of lack of fertilizer and the ability of soil fertility to be targeted.
Fifth, the application of micro-fertilizer should be appropriate. Although trace elements are small in demand on vegetables, they have a great role in vegetable metabolism. There are many types of trace element fertilizers, and boron, molybdenum, zinc, and iron fertilizers are currently used. Trace element fertilizers are used as base fertilizers, and can also be used for seed dressing, soaking seeds or top dressing. The range between the amount of micro-fertilizer and the excess is relatively narrow, and the dosage must be accurate to avoid causing damage.
Sixth, it is necessary to properly supplement carbon dioxide gas fertilizer. Carbon dioxide is the main raw material for plant photosynthesis. It is necessary to properly supplement carbon dioxide in greenhouse vegetable production. At present, the use of ammonium bicarbonate and concentrated sulfuric acid to produce carbon dioxide, carbon dioxide fertilization of greenhouse vegetables is a simple, easy, low cost, convenient method.
Seven, the use of plant growth regulator methods should be appropriate. Plant growth regulators are used properly and are extremely effective, which is unmatched by conventional techniques. However, each type of regulator has certain conditions and scopes in application, especially the strict use time and concentration, and should not be sloppy. Commonly used are ethephon, 2,4-D, chlormequat, gibberellin, ketamine, tomato spirit and the like.
First, the application of chemical fertilizers should be appropriate. The fertilizer in the shed is not easy to be lost. Excessive application of chemical fertilizers may cause the concentration of salt in the soil to increase, which may affect the normal growth of vegetables and the secondary salinization of the soil. Therefore, fertilization must be carried out before fertilization, formula fertilization, avoid blind application.
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