Preventive measures of ammonia poisoning of vegetables in greenhouse

Vegetables grow in the greenhouse, because they are not ventilated, so they are extremely vulnerable to poison gas, of which ammonia poisoning has the highest frequency, so farmers should pay special attention to reduce losses. So what are the symptoms of ammonia poisoning of vegetables in the greenhouse? How to prevent it? Come and have a look with the editor.

1. Occurrence of symptoms

Ammonia enters the body through the stomata and water holes of the plant, and the first to be hurt are the vital leaves and buds, and the damaged leaves will soon fade, as if they had been scalded by boiling water. According to the field observation, if the plant with ammonia poisoning is larger, the disease usually begins on the 2nd-4th leaf, and then spreads up and down, and if the plant is small, it will start from the first leaf. The damaged leaves will fade, and then gradually turn yellow and scorch until the whole plant dies.

2. The cause of poisoning

There are many reasons for ammonia poisoning, such as urea, ammonium bicarbonate and other chemical fertilizers are directly applied on the ground of the greenhouse, these fertilizers will produce ammonia when decomposing, resulting in ammonia poisoning; when applying undermature organic fertilizer, ammonia will also be released in the process of decomposition and fermentation; excessive application of chemical fertilizers and organic fertilizers will also produce a large amount of ammonia; the environment of the greenhouse will also be polluted and ammonia will be introduced.

3. Preventive measures

First of all, it is necessary to fertilize with ammonia, and the use of organic fertilizer as base fertilizer must be fully mature; chemical fertilizer and organic fertilizer can only be applied deeply, not on the ground; and fertilization should not be excessive. In order to check the concentration of ammonia in the shed, the pH test paper can be used to test the pH of water droplets in the greenhouse film. when the pH value is above 8.2, it is necessary to ventilate and reduce the concentration of ammonia. For the cases where ammonia disinfection has already occurred, the first step is ventilation and exhaust, then rapid watering, reducing the concentration of soil fertilizer, spraying active liquid fertilizer outside the root, the concentration is 500 times as high as 1RV, and better balancing the acidity and alkalinity of the plant and soil, which can alleviate the symptoms of poisoning.

The above is the greenhouse vegetables ammonia poisoning prevention measures, hope to help you, want to know more related knowledge, please pay attention to us.