According to many years of experiments, the celery production in the protected area, due to the gas exchange inside and outside the shed, the concentration of carbon dioxide in the greenhouse decreased with the photosynthesis of celery, especially from 9:00 am to 1:00 pm. The application of carbon dioxide gas fertilizer in protected areas is a technical measure to increase production, and the yield per mu can increase by more than 1,000 kilograms.
Chemical reaction method. The reaction of carbonate and strong acid produces carbon dioxide to achieve a suitable concentration of carbon dioxide in the protection zone. In the 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 10-20 points per acre shed, digging a pit with a diameter of 30 cm and a depth of 20 cm at each point, or hanging a discarded plastic bottle or bowl with a rope about 1 m from the ground. In the air.
In order to prevent the foam generated by the reaction of ammonium bicarbonate from being added to the sulfuric acid, the operator and the stems and leaves of the celery may be damaged. In an acid-resistant basin or an open plastic bucket, 3 parts of water may be placed first, and then 1 part of concentrated sulfuric acid may be added. The wall is slowly added to the clean water, stirred constantly, and cooled for later 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 vary depending on the area of ​​control. 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 kilograms of carbon dioxide per acre of protected land per day is effective, and the concentration is not more than 1500 ppm.
The amount of ammonium bicarbonate required per day (grams) = volume of protected space (cubic meters) x concentration of applied carbon dioxide (ppm) x 0.0036. The amount of sulfuric acid required per day (g) = the amount of ammonium bicarbonate required per day (g) x 0.62. This method requires technical skill and strict avoidance of chemical burns.
Apply a compressed bottle of CO2. The carbon dioxide gas is compressed and placed in a steel cylinder (available on the market) and directly applied to the protected area.
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 kilograms of carbon dioxide.
The 1 hour application time can make the carbon dioxide concentration in the greenhouse reach 1200-1500ppm. Although the labor intensity of this method is low, the cost is high.
Burning fuel. 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. . Therefore, this method requires users to be highly vigilant and pay attention to safety. (Zhu Guangkai)
This article URL: How to operate the experimental effect of carbon dioxide gas fertilizer in greenhouse celery
Inner Mongolia Hengxintonghui Supply Chain Management Services Co.,LTD , https://www.hxthfood.com