The Latest Method for Applying Carbon Dioxide Gas Fertilizer to Greenhouse Grapes

The main raw materials for plant photosynthesis are carbon dioxide and water. The organic matter and starch produced by photosynthesis are deposited within the plant as nutrients for the plant's own growth. Therefore, the quality of photosynthesis also affects the growth and development of plants. Nowadays, grape cultivation mostly adopts the greenhouse planting method, but while greenhouse planting provides insulation, it also, because it is often in a closed state, causes the carbon dioxide inside the greenhouse to be unable to be replenished in time, failing to meet the needs of grape growth and development. Therefore, timely supplementation of the carbon dioxide concentration inside the greenhouse is particularly important. Qinnong Web below introduces the application method of carbon dioxide gas fertilizer for greenhouse grapes:

1. Application Time

Usually from the end of February to the end of April, gas fertilizer should be applied after the grapes have already sprouted. In the early stage, because the temperature is relatively low, the gas application time in the early stage is slightly longer, and in the later stage the gas application time can be slightly shortened. The specific gas application time is from 6:50—8:00 every day, that is, it can begin right after sunrise. After applying the gas, keep the greenhouse closed until 9:00, and after 9:00 remove the film for ventilation and cooling. On sunny days, apply more; on cloudy days, apply less; on rainy days, stop applying.

2. Application Concentration and Method

According to experience, the carbon dioxide content per cubic meter of gas is preferably 1.0-1.3 grams. When the temperature is low and the greenhouse remains closed for a long time, the amount can be appropriately increased. The specific gas application method is:

1. First, calculate the required volume and amount of carbon dioxide according to the length, width and height of the greenhouse.

2. Place the carbon dioxide generator in the middle of the greenhouse, which helps the gas diffuse to the surroundings.

3. Put ammonium bicarbonate into a plastic bucket, then add an appropriate amount of clean water and mix, then hang the dilute sulfuric acid bucket at a high place and let it slowly drip through a conduit into the plastic bucket, reacting with the ammonium bicarbonate to produce carbon dioxide.

4. The carbon dioxide is released through another conduit, and after the application is finished, close the valve. The ammonium bicarbonate in the plastic bucket can be used continuously, and should be replaced in time after the reaction is complete. 

3. Application Effect

After applying carbon dioxide gas fertilizer to greenhouse grapes, the effects are mainly shown on the leaves and fruit. The leaf color is noticeably deeper green, the glossiness is deepened, and the thickness increases and the leaves become larger; the fruit colors early, the berries are large and sweet, and the maturity period is more than one week earlier than open-field cultivation, and the yield per mu can increase by 150-250 kg.

4. Precautions

Because the ammonium bicarbonate and dilute sulfuric acid used both have a certain degree of corrosiveness, attention should be paid during use:

1. The reaction liquid must not directly contact the roots or stems of plants;

2. Children are prohibited from contacting the reaction liquid;

3. During use, pay attention to personal safety and prevent the reaction liquid from splashing onto human skin;

4. The temperature inside the greenhouse must be strictly controlled, and attention must be paid to the timing of ventilation and air exchange;

5. If the residual liquid in the reaction bucket is used as fertilizer, care must be taken during application to prevent it from causing phytotoxicity to crops.

If you accidentally come into contact with dilute sulfuric acid, if the amount is small, immediately rinse with a large amount of water, then apply sodium bicarbonate solution (baking soda water), which can minimize the harm caused by sulfuric acid.

The above is Qinnong Web's summary of how to apply carbon dioxide gas fertilizer to greenhouse grapes. The method of using the residual liquid in the reaction bucket as fertilizer refers to adding ten times the amount of clean water to the remaining ammonium sulfate aqueous solution after the reaction is completed, so that it can be used as a topdressing fertilizer for other crops. This can both save costs and avoid burning the crops.