Common types and prevention methods of air damage in shed

In winter and spring, because it is low, the air permeability in the greenhouse is poor, and the air permeability in the greenhouse is poor, which results in the continuous accumulation of harmful gases in the greenhouse, resulting in air damage to the crops in the shed, light leaves yellowing, dry tip, heavy, the whole plant dies. So what are the common types of gas damage? How to prevent and cure it? Let's get to know it with the editor.

1. Ammonia and nitrous acid

Most of these two kinds of gas damage are caused by improper fertilization, such as the application of ammonium bicarbonate or a large amount of urea and immature organic fertilizer during topdressing, as well as high temperature, drought and poor ventilation. it often produces a large amount of ammonia and nitrous acid gas in a short time, resulting in plant poisoning. Often turn out to be water-stained spots on the edge of the leaf, like being scalded by boiling water, or gradually turn brown and dry and fall off.

Prevention and control methods: ammonium bicarbonate, urea and ammonium sulfate are not used for fertilizer application in the greenhouse. Farm manure and organic fertilizer must be applied after full maturity.

2. Carbon monoxide and chlorine dioxide

When heating with coal or carbon fire in the greenhouse, a large amount of carbon monoxide and sulfur monoxide are produced because the combustion is insufficient or the flue is not smooth. When crops are harmed by these two kinds of gas damage, the leaf veins first appear flaky white or yellow, and in severe cases, the whole leaf turns into a green reticular skeleton, and then slowly die.

Prevention and control methods: the greenhouse heating as far as possible to use electric heaters, as far as possible to use the traditional heating methods, even if you want to use, be sure to drive low sulfur content of the combustion, but also to ensure safety.

3. Film dispersing poison gas

Some plastic films are planted with plasticizers and stabilizers, which emit toxic gases such as ethylene and chlorine, as well as harmful substances such as 2-isobutyl phthalate. When these air injuries occur, the leaves will appear light brown irregular spots, serious leaves become white or even fall off, but also cause flowers leaf tip, leaf edge yellowing, or even white and dry.

Prevention and control methods: to timely ventilation, the use of sunny noon to open the vent, timely in rainy and snowy days, but also for a short period of ventilation to reduce the harm of toxic gases.

4. Overuse of drugs

In the use of drugs and or excessive fumigant, or the use of fumigant is reasonable, such as formalin, methyl bromide can only be used in the empty shed, easy to cause drug damage in the plant growing season. All these will cause plants to appear leaf yellowing, dry tip and other phenomena.

Prevention and control methods: the use of chemicals must be scientific and reasonable, must not be used indiscriminately, so as to avoid the main measures of gas damage caused by drug damage.

The above is the introduction of common types and prevention methods of air damage in shed. I hope it can help you. If you want to know more about it, please pay attention to us.