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Ammonia poisoning hazards are divided into two types: traumatic type and internal injury type. The traumatic hazard is mainly caused by damage to the leaves of the seedlings, and the leaf margin tissue turns brown first, then becomes white, and water-stained spots appear first around the leaves, and die in severe cases. The internal injury type hazard is generally caused by a large amount of ammonium nitrogen fertilizer applied at one time, the soil solution concentration is too high, the nutrients absorbed by the vegetables are blocked, the cell permeation resistance is increased, and the reverse osmosis phenomenon is serious, the root water loss becomes brown, and the leaves turn yellow.
Poor ventilation in the winter shed is prone to fat and gas damage. In view of the reasons for the fertilizer damage caused by farmers in the past few years, the main reasons are as follows: application of excessive ammonium fertilizer; application of organic fertilizers such as insufficiently fermented manure and bean cake; application of urea or ammonium bicarbonate in the shed; soil drying The ventilation is not timely. Although the fat damage is not a disease, once it happens, if it is not handled properly, it can be completely destroyed in 1-2 days, and the damage caused is distressing.
Control measures: watering in time, the soil should not be too dry, and it should be kept moist. Some vegetable farmers are controlling the seedling period, control the water over the head, and are prone to ammonia poisoning. In the seedling stage, combined with watering, it can be sprayed to help maintain the culture. Do not apply fertilizer in the shed, apply the soil deeply, and apply water after application. The applied organic fertilizer is applied after being fully decomposed. Do not overdose ammonium and ammonium nitrate fertilizers, and apply a small amount of fertilizer. Under the condition of ensuring the temperature of the seedlings, open the window as much as possible to ventilate and reduce the ammonia in the shed. The occurrence of fertilizer damage and timely watering have a good effect.
In winter, crops in greenhouses often suffer from chemical fertilizer burning, ammonia hazard and nitrous acid gas poisoning.
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