Excessive fertilization of vegetables

Appropriate amount of fertilizer, nutrient balance, organic and inorganic rational application can not only improve vegetable yield and nutritional quality, sensory quality and storage quality; rational fertilization can also reduce damage to soil microbes, balance soil microbial population, and improve vegetable resistance Sex, reduce the occurrence of soil-borne diseases and insect pests, thereby reducing the demand for pesticides, reducing the pollution of fertilizers and pesticides, thereby improving the sanitary quality of vegetable products and achieving a win-win situation for both economic and environmental benefits.

Rational application based on different fertilizer types enables all kinds of fertilizers to exert their maximum yield-increasing efficiency; rational fertilization based on the special requirements of different vegetables for nutrient elements, so that vegetables can meet their physiological and nutritional needs; Reasonable fertilization based on nature and fertility, so that the amount of fertilizer is different due to the difference in soil fertility, so as to avoid more or less application. The same type of vegetables have similar absorption laws for nutrients, and vegetables are generally potassium-loving crops.

The regression relationship between the amount of nitrogen, phosphorus and potassium and the yield of vegetables is a parabolic equation, indicating that nitrogen, phosphorus and potassium increase production when a certain amount is applied. However, no matter which element, over-production will reduce the yield of vegetables, and fertilization is not The more the better, not the high investment will be high output. The relationship between the amount of fertilizer applied and the quality index of vegetables is the same as that of yield. The appropriate amount of nitrogen, phosphorus and potassium can make the highest level of vitamin C and soluble sugar in vegetables, and the amount of vitamin C and sugar in vegetables will be reduced when the fertilizer is excessive.

Principles for rational fertilization of vegetables: pay attention to the application of organic fertilizers, rational application of organic and inorganic fertilizers, banned unfertilized organic fertilizers; balance NPK, suitable application of trace elements, according to the nutritional needs of different vegetables in different growth stages Master the time and quantity of fertilization, avoid nutrient imbalance, cause pests and diseases; re-apply base fertilizer, base fertilizer mainly organic fertilizer and phosphate fertilizer, advocate deep application; rational topdressing, diligent application of thin application; application of soil testing formula technology, due to soil-based vegetables Fertilize in a scientifically appropriate period and in moderation.

Taking leafy fertilization as an example, organic fertilizer and phosphate fertilizer are all applied as base fertilizer, and 50% of nitrogen fertilizer and potassium fertilizer are used as base fertilizer or not as base fertilizer. 50% of the special fertilizer is used as the base fertilizer. The inorganic fertilizer reserved for topdressing should be formulated into water and fertilizer, and the first fertilizer should be applied after transplanting. After that, it should be applied once every 7 days, and it should be finished 3 times or more. Stop the topdressing within 7 days before harvesting the vegetables. (Source: China Vegetable Information Network)

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