How to apply carbon dioxide fertilizer rationally
Carbon dioxide (CO2) is a constituent of air and is a raw material for photosynthesis. The suitable concentration of carbon dioxide in greenhouse vegetable is generally not less than 800-1000mg/L, but carbon dioxide is often lacking in a closed greenhouse where the sunlight is sufficient and the crop is prosperous; when the concentration is lower than 80-10mg/L, the normal growth of vegetables will be severely restricted. . In this case, in addition to proper ventilation, proper close planting, organic fertilizer application, and scientific application of nitrogen fertilizer, it is often necessary to use carbon dioxide as a fertilizer. This is carbon dioxide fertilizer, also called gas fertilizer. In greenhouses or greenhouses, chemical methods, biological methods such as straw bioreactor technology can be used to generate carbon dioxide or apply carbon dioxide fertilizers to correct carbon deficiency. The following only describes a simple chemical method for generating carbon dioxide: Prepare a number of plastic buckets and suspend them 100 cm from the ground; Prepare dilute sulfuric acid (sulfuric acid is slowly added to water at a ratio of concentrated sulfuric acid to water of 1:3). ) Divide with ammonium bicarbonate into several portions. Place 1 part in each barrel. Dilute sulfuric acid and then ammonium bicarbonate. The interaction between the two produces CO2 gas. This method is simple and effective, but it must pay attention to safe operation. Commodity carbon dioxide fertilizer has three forms of solid, liquid and gas. Solid-state fertilizers can be dry ice or granules. Dry ice becomes CO2 gas at room temperature for crop absorption and utilization. Due to difficulties in transportation and preservation, the cost is higher. When used, one cannot directly contact dry ice to prevent cold damage. The granules can be directly sprinkled on the ground or buried in soil and produce CO2 gas after absorbing water. The amount of mu is about 40 kg and can be released continuously within 40 days. When the liquid manure is used, the cylinder filled with CO2 is placed in the protected area, and the CO2 gas is sent through a pressure reducing valve to the site where the crop can be fully utilized. A hole is drilled every 3 mm on the hose, and the hole diameter gradually increases from the cylinder to the cylinder, so that the carbon dioxide gas can be reflected by the shed film to the ground. When the bottle mouth pressure is between 1 and 1.2 kg/m2, it can be released every day for 6 to 12 minutes. The gaseous fertilizer (double-micro CO2 gas fertilizer) is a kind of biological product. The particles contain a large amount of microorganisms, and carbon dioxide is produced through fermentation under suitable conditions, which has low cost and practical features. 1 grain per square meter, depth 3 cm, mu application rate of not less than 6.7 kg. The relative humidity of the soil is required to be about 80%, and the soil temperature is above 15°C. Once used, it can continuously release carbon dioxide for more than 30 days.
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