The gas in the shed mainly refers to some gases such as carbon dioxide, ammonia, and nitric acid gas.
The industrialized planting of citrons is carried out under high density and confined conditions. There is almost no gas exchange. In addition, the photosynthetic, respiration and microbial activities of citrons, the decomposition of organic matter, and the concentration of carbon dioxide in sheds are always at a low level. At night, the concentration of carbon dioxide in the room can reach 0.1%. During the day, due to the photosynthesis of Toona sinensis, the concentration of carbon dioxide decreases sharply. Under normal production conditions, it is not necessary to supplement carbon dioxide. However, if the light intensity and illumination time are appropriate, when the temperature is between 20 and 25°C, properly increasing the carbon dioxide concentration will promote the photosynthesis of Toona sinensis, increase the dry matter accumulation of axillary buds, and improve the yield and quality of axillary buds. According to the experiment, when the indoor carbon dioxide concentration increased to about 0.1%, the axillary bud yield increased 3 to 4 times. When the carbon dioxide concentration was 0.05% to 0.06%, the axillary bud yield increased 1.2 times. The commonly used carbon dioxide supplementation methods in production are:
(1) Organic fertilizers are added to the organic fertilizer fermentation shed to release more carbon dioxide by enhancing microbial activity and decomposition of organic matter. According to the determination, when the maximum calorific value peaks, the concentration of carbon dioxide in indoor air is more than 100 times that of carbon dioxide in the air without organic fertilizer. Because of its low cost, it has been widely used in production. However, this method has the disadvantages that the amount of carbon dioxide generated is not easily controlled and the effective time is concentrated.
(2) The by-product of the ethanol brewing industry uses the gaseous carbon dioxide produced when brewing alcohol to make liquid carbon dioxide, or it is compressed to produce solid carbon dioxide (dry ice), and carbon dioxide is added to the shed. But need some device.
(3) The burning of coal, coke, biogas, etc. can increase the concentration of carbon dioxide on the one hand, and it can also increase the temperature on the other hand. This type of source can be appropriately selected when it is adequate, but it requires a certain device.
(4) Chemical decomposition uses carbon dioxide emitted by carbonate to enhance the effect of sulfuric acid and supplements the carbon dioxide content in the shed. This method is currently used in production. However, certain devices are also required, and the amount of carbon dioxide is not easy to control and master.
(5) Carbon dioxide granule fertilizer is used to slowly release carbon dioxide. The carbon dioxide fertilizer is applied to the surface, and the release rate and release amount of carbon dioxide are automatically adjusted according to changes in the light conditions in the greenhouse. This technique is simple, easy to use, and low in price.
The concentration of ammonia gas, nitric acid gas and other gases in industrialized toon cultivation will cause harm to Toona sinensis, and attention should be paid to prevention in production. Basal fertilizer should be applied with fully mature organic fertilizer, and the top dressing should be applied in small quantities several times to deepen and cooperate with watering. Regular ventilation and ventilation are needed to strengthen the management of fertilizer and water, promote the growth of toon and reduce the loss.
The industrialized planting of citrons is carried out under high density and confined conditions. There is almost no gas exchange. In addition, the photosynthetic, respiration and microbial activities of citrons, the decomposition of organic matter, and the concentration of carbon dioxide in sheds are always at a low level. At night, the concentration of carbon dioxide in the room can reach 0.1%. During the day, due to the photosynthesis of Toona sinensis, the concentration of carbon dioxide decreases sharply. Under normal production conditions, it is not necessary to supplement carbon dioxide. However, if the light intensity and illumination time are appropriate, when the temperature is between 20 and 25°C, properly increasing the carbon dioxide concentration will promote the photosynthesis of Toona sinensis, increase the dry matter accumulation of axillary buds, and improve the yield and quality of axillary buds. According to the experiment, when the indoor carbon dioxide concentration increased to about 0.1%, the axillary bud yield increased 3 to 4 times. When the carbon dioxide concentration was 0.05% to 0.06%, the axillary bud yield increased 1.2 times. The commonly used carbon dioxide supplementation methods in production are:
(1) Organic fertilizers are added to the organic fertilizer fermentation shed to release more carbon dioxide by enhancing microbial activity and decomposition of organic matter. According to the determination, when the maximum calorific value peaks, the concentration of carbon dioxide in indoor air is more than 100 times that of carbon dioxide in the air without organic fertilizer. Because of its low cost, it has been widely used in production. However, this method has the disadvantages that the amount of carbon dioxide generated is not easily controlled and the effective time is concentrated.
(2) The by-product of the ethanol brewing industry uses the gaseous carbon dioxide produced when brewing alcohol to make liquid carbon dioxide, or it is compressed to produce solid carbon dioxide (dry ice), and carbon dioxide is added to the shed. But need some device.
(3) The burning of coal, coke, biogas, etc. can increase the concentration of carbon dioxide on the one hand, and it can also increase the temperature on the other hand. This type of source can be appropriately selected when it is adequate, but it requires a certain device.
(4) Chemical decomposition uses carbon dioxide emitted by carbonate to enhance the effect of sulfuric acid and supplements the carbon dioxide content in the shed. This method is currently used in production. However, certain devices are also required, and the amount of carbon dioxide is not easy to control and master.
(5) Carbon dioxide granule fertilizer is used to slowly release carbon dioxide. The carbon dioxide fertilizer is applied to the surface, and the release rate and release amount of carbon dioxide are automatically adjusted according to changes in the light conditions in the greenhouse. This technique is simple, easy to use, and low in price.
The concentration of ammonia gas, nitric acid gas and other gases in industrialized toon cultivation will cause harm to Toona sinensis, and attention should be paid to prevention in production. Basal fertilizer should be applied with fully mature organic fertilizer, and the top dressing should be applied in small quantities several times to deepen and cooperate with watering. Regular ventilation and ventilation are needed to strengthen the management of fertilizer and water, promote the growth of toon and reduce the loss.
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