First, the hazard approach
Ammonia enters the body through the pores and pores of the plant, causing young shoots and the most vital leaves to be the first to be harmed. As the ammonia gas enters the body and the reduction takes place, the victim's leaves quickly appear discolored and resembles boiled water.
Second, the symptoms
Ammonia enters the body through the stomata and pores of the plant, causing the most viable leaves near the mulching hole to be damaged first. According to field observations, if there is a large number of plants when ammonia damage occurs, it is generally the first 2 to 4 leaf diseases, and then spread upwards and downwards; if the plants are small, the disease starts from the first leaf. The victim's leaves quickly appeared discolored and water-like, and then gradually yellowed and coked until the whole plant died.
Third, the cause of poisoning
1. Spread ammonia gas, ammonium bicarbonate, human fecal urine, etc. to directly produce ammonia gas on the ground of the greenhouse;
2. Apply organic fertilizer that has not yet been decomposed and release ammonia in the conversion process;
3. Fertilizer or organic fertilizers are more likely to produce ammonia when they are put into excessive quantities;
4. Environmental pollution around the greenhouse will introduce ammonia.
Fourth, poison prevention measures
Ammonia poisoning in greenhouse vegetables occurs every year to varying degrees, resulting in loss of greenhouse vegetable production. However, early identification of the safe state of gas in the shed can prevent such damage.
1, safe fertilization
Vegetables in greenhouses should pay attention to the following points regardless of the application of base fertilizer or top dressing.
First, the application of organic fertilizer as a base fertilizer, must be fully cooked; Second, chemical fertilizers and organic fertilizer can only be applied in the ground can not be deep; Third, fertilization can not be excessive, especially a small amount of topdressing should apply multiple times; four is appropriate Fertilize, or apply irrigation, so that the fertilizer can be released and released in time.
2, detection of ammonia
Check the gas status in the shed. You can use the pH test paper sold by the pharmaceutical company to determine the pH of the water droplets in the shed. When the pH is above 8.2, the air must be vented immediately. If it is a little slow, poisoning will occur.
3, timely rescue
When vegetables in greenhouses have symptoms of ammonia poisoning, besides air release, they must be quickly flooded to reduce the concentration of soil fertilizer solution; the active liquid fertilizer should be sprayed outside the roots at a concentration of 1:500, which can better balance plants. Phosphate in the body and soil; 1% vinegar can be sprayed on the back of the plant leaves to reduce and mitigate the hazard.
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