Non-pollution cucumber topdressing carbon dioxide gas fertilizer
Carbon dioxide is the raw material for photosynthesis of plants. Due to the small amount of air leakage during the cultivation of cucumber in the solar greenhouse in winter and spring, the indoor CO2 concentration was reduced to the lowest point at 10-14, which is the strongest photosynthesis of the plant, and it showed a serious deficit, which will inevitably affect the growth and development of cucumber plants. Supplementing carbon dioxide gas can greatly increase the photosynthetic efficiency of plants, make plants grow robustly, and increase disease resistance, thereby increasing yield.
At present, chemical reactions are used for carbon dioxide fertilization in production. This method is simple, inexpensive, suitable for rural conditions, and easy to promote. That is, industrial sulfuric acid and fertilizer ammonium bicarbonate react to produce carbon dioxide.
First, place 3 volumes of water in a plastic or ceramic vessel, add 1 part by volume of concentrated sulphuric acid slowly into the water along the wall while stirring, stir well, and cool to room temperature. Then, the prepared dilute sulfuric acid is put into an open plastic bucket, and the amount can be put into 2-3 d at one time. After the ammonium bicarbonate that is added once in the plastic bucket is completely converted into carbon dioxide, the dilute sulfuric acid is left to be saved. The trouble of frequently diluting the sulfuric acid can also prevent excess production of ammonium bicarbonate and produce ammonia, which is detrimental to crop growth. When used, the ammonium bicarbonate should be wrapped in thick paper. Insert a few holes in it and slowly put it into dilute sulfuric acid to avoid the reaction being too violent and splashing sulfuric acid. Ammonium bicarbonate must not float on the reaction solution to prevent the generation of ammonia gas. Because carbon dioxide is heavier, it should sink and spread after it is generated. Therefore, the barrel of sulfuric acid should be suspended in the air, which is conducive to the absorption of functional leaves. The height of the suspension is appropriately increased upwards with the growth point of the plant, generally slightly higher than the growth point of the plant. To make carbon dioxide evenly distributed, usually 6-8 occurrence points should be set evenly for every 667 square meters of greenhouse. After the sulfuric acid is fully reacted with ammonium bicarbonate (ie, no ammonium hydroxide is released after ammonium bicarbonate is added), the liquid ammonium sulfate obtained can be diluted 50 times directly for top dressing.
The amount of reactants required per day can be calculated according to the following formula: Ammonium bicarbonate amount (grams) = volume of protected space (cubic meters) Ã— application carbon dioxide concentration 0.000001 Ã— 0.0036 required amount of sulfuric acid (grams) = daily The amount of ammonium bicarbonate required (g) Ã— 0.62 Note: The space volume of the protected space = the area of â€‹â€‹the protected area Ã— the average height; the application concentration of carbon dioxide for the cucumber in the protected area is 1200 Ã— 0.000001-2000 Ã— 0.000001; 0.0036 is 1 Ã— per cubic meter 0.000001 grams of ammonium bicarbonate required for CO2; 0.62 is 1 gram of ammonium bicarbonate reacted with 0.62 grams of sulfuric acid.
In addition, using the carbon dioxide particulate fertilizer developed by the Shandong Academy of Agricultural Sciences, burying it in soil or adding water to a container, carbon dioxide can be produced and released slowly into the air. The advantage of this method is that it does not require special equipment and is simple and easy to implement. The disadvantage is that the release time is not easily controlled. Cucumber should be applied during the fruiting period, and it should not be applied before flowering and fruit setting, so as to avoid excessive growth of nutrients caused by excessive nutrition. When winter light is weak, crops are growing poorly, and carbon dioxide concentration is low, it can be applied earlier. According to changes in carbon dioxide during the day in the greenhouse, carbon dioxide is generally applied half an hour after sunrise on a sunny day and is stopped half an hour before release. Carbon dioxide fertilization is usually selected on a sunny morning and is usually not applied in the afternoon. In addition, in cloudy, rainy, snowy weather, or when the temperature is low, photosynthesis is weak and there is no need to apply it.
Source: Guangdong Agricultural Information Network
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