The Occurrence and Prevention of Vegetable Fertilizer in Greenhouse
Ammonia poisoning has frequently occurred in the production of greenhouses in recent years. The poisoning of ammonia poisoning is classified into traumatic and internal injuries. Trauma hazards are mainly seedling leaves, leaf margin tissue first brown, after the white, around the leaves first water spots spots, severe withered. Internal damage is generally a large amount of ammonium nitrogen fertilizer applied to cause high concentration of soil solution, vegetable absorption of nutrients blocked, increased cell permeation resistance, severe reverse osmosis occurs, the root loss of water becomes brown, leaves turn yellow. Generally, pH value of small water droplets attached to the inner wall of a vegetable greenhouse or an inner wall of a dome can exhibit symptoms of ammonia poisoning. Therefore, pH test paper can be used for testing.
Poorly ventilated sheds in vegetable greenhouses are poorly ventilated, and vegetables are prone to damage. The main causes of comprehensive damage are as follows: excessive application of ammonium nitrogen fertilizer; application of manure and bean cake, etc. that are not sufficiently fermented and fermented; application of urea or ammonium bicarbonate in the shed; dry soil; ventilation is not timely. Although the damage is not a disease, once it occurs, if it is handled improperly, it can be completely destroyed in 1 to 2 days, and preventive work should be done.
Control measures to water in a timely manner, the soil can not be too dry, to maintain a moist state, see dry watering. Some vegetable farmers are prone to controlling the seedlings, control the water over their heads, and are 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 fully decomposed before application. Do not overdosed with 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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