Applying chemical fertilizers on greenhouse vegetables, such as applying more urea, ammonium bicarbonate or ammonium sulfate at one time, especially after surface application or foliar application, it is easy to produce a large amount of ammonia gas when it is exposed to high temperature in the shed. When the ammonia content in the greenhouse reaches 5 ppm, the leaves on the outside of the plant will be damaged, and the impregnated spots will appear, and then gradually become brown, and spread to the whole leaf and die. Vegetables sensitive to ammonia are eggplant, tomato, pepper, cucumber, etc. To prevent the occurrence of fertilizer damage in greenhouse vegetables, the following points should be noted:
First, scientific fertilization. Fertilization in the shed should be based on the base fertilizer, supplemented by topdressing. If you need topdressing, you should adhere to the principle of “eat less and eat more mealsâ€, that is, the number of times and the amount of use are small. Each time, the urea or ammonium sulfate is applied for 5 to 10 kilograms per mu, and the soil with a thickness of about 10 centimeters is applied and poured immediately. water. When applying fertilizer, do not apply ammonium bicarbonate as much as possible.
Second, ventilation and ventilation. When the temperature is high at noon on a sunny day, open the vents to circulate the air in the shed and reduce the harmful gas content in the shed.
Third, strengthen management. In a plastic greenhouse or greenhouse that is directly heated by fire, the burning materials should be fully burned, and attention should be paid to the ventilation work of the greenhouse.
First, scientific fertilization. Fertilization in the shed should be based on the base fertilizer, supplemented by topdressing. If you need topdressing, you should adhere to the principle of “eat less and eat more mealsâ€, that is, the number of times and the amount of use are small. Each time, the urea or ammonium sulfate is applied for 5 to 10 kilograms per mu, and the soil with a thickness of about 10 centimeters is applied and poured immediately. water. When applying fertilizer, do not apply ammonium bicarbonate as much as possible.
Second, ventilation and ventilation. When the temperature is high at noon on a sunny day, open the vents to circulate the air in the shed and reduce the harmful gas content in the shed.
Third, strengthen management. In a plastic greenhouse or greenhouse that is directly heated by fire, the burning materials should be fully burned, and attention should be paid to the ventilation work of the greenhouse.
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