In recent years, ammonia poisoning has frequently occurred in the production of greenhouses, causing damage to both traumatic and internal injuries. The traumatic type mainly damages the leaves of the seedlings, and the leaf margin tissues first become brown and then become white, and water-stained spots appear around the leaves, and they die when they are severe. Internal damage is generally a large amount of ammonium nitrogen fertilizer applied to cause high soil solution concentration, vegetable absorption of nutrients blocked, increased cell resistance, severe reverse osmosis occurs, the root loss of water becomes brown, leaves turn yellow. Generally, the pH value of the small water droplets attached to the inner wall of the vegetable greenhouse or arch shed is above 7.2, which can express the symptoms of ammonia poisoning. Therefore, pH test paper can be used for testing.
Analysis of the reasons: Greenhouses grow vegetables. If there is poor ventilation in the greenhouses, vegetables are prone to be fattened. The main causes of comprehensive damage are as follows: excessive application of ammonium nitrogen fertilizer; application of manure and soybean meal that are not fully fermented and fermented; organic fertilizer such as urea or ammonium bicarbonate in the shed; dry soil; Although the damage is not a disease, once it occurs, if it is handled improperly, it will be completely destroyed in 1 to 2 days, so we must do preventive work.
Prevention methods: watering in time, the soil can not be too dry, to maintain a moist state, see the dry watering. Some vegetable farmers are prone to controlling seedlings, controlling water over their heads and prone to ammonia poisoning. Do not use chemical fertilizers in sheds. Instead, you have to put a lid on the soil and apply watering. The applied organic fertilizer should be applied after sufficient decomposing, and do not over-apply ammonium nitrogen fertilizer and ammonium nitrate fertilizer. To ensure the temperature of the seedlings, try to ventilate and reduce ammonia in the shed.
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