Causes and prevention measures of gas poisoning in greenhouse vegetables

When growing vegetables in greenhouse or greenhouse in winter and spring, greenhouse vegetable gas poisoning occurs from time to time because of lack of timely ventilation or improper management of cultivation measures. If it is light, it will affect the poor growth and development of the plant, and if it is heavy, it will wither and die, so what is the cause of gas poisoning? Come and have a look with the editor.

I. types and causes of common gas poisoning

1. Ammonia and nitrous acid

Ammonia and nitrous acid in the greenhouse mainly come from ammonia fertilizer and organic fertilizer applied to the soil, which will decompose a large amount of ammonia in a short period of time in case of high temperature, causing vegetable burns.

2. Plastic film poison gas

Some inferior plastic films emit toxic gases such as chlorine and ethylene during use, which can invade the interior of the plant and seriously affect the yield of vegetable varieties.

3. Aerosol pesticides

When excessive aerosol pesticides are used, the top leaves and leaf edge tissues of vegetables will die, and the damage will be more serious under the condition of high temperature and humidity.

4. Carbon monoxide and carbon dioxide

The use of coal fire heating in the shed is that the odor combustion is incomplete or poor ventilation, which will often cause excessive concentration of carbon monoxide and carbon dioxide, which will do harm to vegetables in different degrees.

Second, harmful symptoms

In general, ammonia damage mostly occurred on the leaves on the outside of the plant, the injured place was flooded, the leaf edge was burnt, and then gradually withered, blackened and died. Nitrous acid usually occurs on the leaves in the middle of the plant, and the damaged leaves will produce waterlogged spots, and when serious, the leaves become white and withered. When damaged by carbon dioxide gas, the leaf veins will first appear obvious patchy leukoplakia or macula, and in severe cases, the whole leaf will become a green reticular skeleton and gradually die. When carbon monoxide poisoning occurs, the leaves will wither, and when the concentration is too high, vegetables will suffocate and die in a short period of time.

III. Prevention and control methods

First of all, we should pay attention to ventilation, can use the noon temperature is too high, open the vent, so that air circulation, even when cloudy or rainy and snowy days, but also at noon as much as possible ventilation, reduce harmful gas concentration. In order to apply fertilizer reasonably, we should give priority to rotten farm manure, apply phosphorus and potassium fertilizer properly, apply less nitrogen fertilizer as much as possible, and adhere to the principle of base fertilizer and topdressing fertilizer. Try not to use toxic plastic films with plasticizers or stabilizers. When using coal fire to heat up, let the fuel burn fully as far as possible, at the same time, the harmful gas should be discharged according to the chimney.

IV. Remedial measures

For the greenhouse where gas poisoning has occurred, the ventilation rate should be increased as soon as possible, and the harmful gas should be eliminated in time. For the gas damage caused by topdressing, it can be timely watering to reduce the fertilizer concentration, or spraying foliar fertilizer to enhance the plant resistance and reduce the toxicity. The harm caused by carbon dioxide can be remedied by spraying lime water and stone-sulfur mixture.

The above is the greenhouse vegetable gas poisoning causes and prevention measures, hope to help you want, want to know more related knowledge, please pay attention to us.