Greenhouse vegetables fertilization pay attention to things

Greenhouse vegetables have high requirements for fertilization. If fertilization is improper, it will not only lead to soil compaction and cause vegetable damage, but it will also affect the nitrate and nitrite content. And these two substances have great harm to human health. Therefore, in the greenhouse vegetable production, we must be careful to apply chemical fertilizers, scientific fertilization.
More organic fertilizer, less organic fertilizer Fertilizer organic fertilizer content is complete, long-term fertilizer effect, after application can not only improve the vegetable soil, but also provide a variety of nutrients for vegetables. Applying organic fertilizer per mu of greenhouse must be at least 3 cubic meters.
Controlling chemical nitrogen fertilizers and increasing phosphorus and potassium fertilizers Although nitrogen fertilizers are indispensable fertilizers in greenhouse vegetable production, they cannot be used excessively. Phosphorus and potassium, as quality elements, can participate in all biochemical reactions in vegetables, and can activate more than 60 enzymes in vegetable bodies, which can significantly increase the stress resistance of vegetables. Therefore, they should be used in large quantities. In addition, in the production and management of greenhouse vegetables, the frequency and time for lifting and opening the windows should be appropriately increased to increase the light intensity so as to minimize the nitrate content in the vegetables.
Chemical nitrogen fertilizers that need to be banned or limited are mainly include:
It is forbidden to use nitrate nitrogen such as ammonium nitrate, potassium nitrate and compound fertilizer containing nitrate nitrogen to reduce the accumulation of nitrate in vegetables.
It is not suitable to apply chlorinated fertilizers such as potassium chloride and ammonium chloride. Chloride ion can reduce the starch content in vegetables, make the quality deteriorate, the yield decreases, and the residue in the soil can cause decalcification of the soil, causing hardening.
Limited use of magnesium sulfate, ammonium sulfate fertilizer because of sulfate ions in the fertilizer, not easily absorbed by vegetables and remain in the soil, endangering the growth of vegetables. In addition, limited use of ammonium bicarbonate, due to ammonia volatilization, can easily cause ammonia harm.
Implementation of soil testing formula, balanced fertilization, and vigorous promotion of vegetable-specific compound fertilizers. Specific fertilizers are developed based on the characteristics of different vegetables requiring fertilizers and fertilizer supply status of the soil. The nutrients are more complete, the nutrition is more scientific, the formula is more reasonable, and the pertinence is stronger. After application, the yield of vegetables and the quality of vegetables can be significantly improved.
We will vigorously promote new fertilizers such as zinc, molybdenum, calcium, and magnesium. These nutrients can positively improve the quality of vegetables and are also essential for vegetable growth.
Vigorously promote bio-fertilizers, especially to promote bio-organic compound fertilizers. Biofertilizer contains microorganism-activated bacteria. It is a “four-in-one” fertilizer compounded by organic fertilizer, inorganic fertilizer, bacterial fertilizer, and synergist. It realizes the scientific cooperation of various fertilizers, complements each other's advantages, and promotes mutual benefits. One of the best fertilizers for balanced fertilization in greenhouses. Application of bio-organic compound fertilizer can improve the soil, increase soil fertility, and create a good growth environment for greenhouse vegetables.
The use of hormones such as gibberellin (920), ethephon, paclobutrazol, etc. can be used to limit the use of hormones, but it can greatly improve the quality of vegetables, but it can also adversely affect the health of people. Therefore, hormones should be used less.