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Carbon dioxide can increase production, so how to use it properly? Professor Li said that there are mainly three ways. The first is the chemical reaction method. That is, the reaction of carbonate and strong acid produces carbon dioxide to achieve a suitable concentration of carbon dioxide in the protection zone. In production, it is generally reacted with dilute sulfuric acid and ammonium hydrogencarbonate to form ammonium sulfate, water and carbon dioxide. The specific method is to take 10 to 20 points per acre shed, digging a pit of 30 cm in diameter and 20 cm in depth at each point, or hanging a discarded plastic bottle or bowl with a rope about 1 m from the ground. The air. In order to prevent the foam generated by the reaction of ammonium bicarbonate from adding sulfuric acid, and hurt the stems and leaves of the operator and celery, use an acid-resistant basin or an open plastic bucket, first put 3 parts of water, then 1 part of thick The sulfuric acid is slowly added to the clean water along the wall, and the mixture is continuously stirred and cooled for use. The container may be charged with sulfuric acid for 3 days in a single reaction, and ammonium hydrogencarbonate may be added thereto in an amount as needed every day. The amount of sulfuric acid placed at each point can be determined according to the control area. Add ammonium bicarbonate half an hour after sunrise every day, stir while stirring, and then seal the protective ground for 2 hours before releasing the air. Starting from the slow seedling, it can be applied continuously for 40 to 60 days, and it should be parked in rainy days. The application of 1 to 2 kg of carbon dioxide per acre of protected land per day can significantly increase production, and its concentration should not exceed 1500 ppm. The amount of ammonium bicarbonate required per day (g) = the volume of the protective space (m3) × the concentration of carbon dioxide applied (ppm) × 0.0036; the amount of sulfuric acid required per day (g) = the amount of ammonium bicarbonate required per day (g) ) × 0.62.
Another method is to apply liquid carbon dioxide. The carbon dioxide gas is compressed and placed in a steel cylinder (available on the market) and placed directly into the protected area for application. Generally, there are two parallel vent pipes in the protection ground, one is about 80 cm from the ground, one is 10-20 cm from the roof, and a hole of 0.3 cm in diameter is made every 60 cm on the pipe. Deflate once at 11:30, and add about 2 kg of carbon dioxide. In 1 hour, the concentration of carbon dioxide in the greenhouse can reach 1200-1500ppm. This method has low labor intensity but high cost.
The third method is to burn fuel to produce carbon dioxide. The fuel used, such as kerosene, coal gas, coal, etc., is easy to source and easy to use. It can increase the concentration of carbon dioxide and increase the temperature. However, the concentration of carbon dioxide gas is not easy to control. In the combustion, harmful gases such as carbon monoxide and sulfur dioxide are often accompanied. ,higher cost.
Author: Xu Zhibo (Source: Hebei Science and Technology News)
In the production of celery, due to the obstruction of gas exchange inside and outside the shed, the concentration of carbon dioxide in the shed decreases with the photosynthesis of celery, especially at 9:00 to 1 pm. In order to improve the photosynthesis rate of celery and promote the growth and development of celery, the application of carbon dioxide gas fertilizer in the protected area is a technical measure with significant economic benefits. Tests have shown that the application of carbon dioxide can promote the development of celery roots, enhance photosynthetic capacity, increase the net assimilation rate, robust plants, strong resistance, and can increase production by more than 1,000 kg per mu.
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