Different plants have different carbon dioxide requirements under different climatic conditions. If the CO2 concentration exceeds the limit, crops will be reduced. Therefore, the device must monitor and control the concentration of CO2 in the air so that it reaches its optimum value. At present, the existing carbon dioxide detectors at home and abroad are expensive and are not suitable for use by Chinese farmers. For this reason, it is proposed to develop a cheap carbon dioxide detector as soon as possible to solve the urgent problem of vegetable production.
More than 95% of crop yields come from photosynthesis. That is, plants use sunlight to synthesize carbon dioxide and water into carbohydrates. However, the content of CO2 in the air is too low, only 3Oppm. Therefore, increasing CO2 gas fertilizer in greenhouses or plastic squats can significantly increase vegetable production. The successful development of a new type of carbon dioxide detector is characterized by low prices (only a few hundred dollars). High precision, AC and DC dual-use. Pull-type, low power consumption (power saving), simple operation. Very suitable for rural areas.
According to the demonstration results of CO2 detectors across the country in the past two years, the effect of vegetable production increases significantly. Compared with the control greenhouses, the average increase in the yield per mu was 20%. For example, in 1995, Rongtian used a carbon dioxide detector in greenhouses and plastic greenhouses in the suburbs of Changchun City, Jilin Province to monitor and control CO2 gas fertilizers. The yield of cucumber per mu has increased by more than 1,500 kilograms. Each year, plastic sheds will receive at least two meals, and greenhouses will receive at least four meals. This will increase income by several thousand dollars. There are at least 10 million greenhouse and plastic sorghum varieties of vegetables in the country. Each year will increase production by several hundred billion kilograms of vegetables, which will have significant social benefits.
The stronger the sunlight, the higher the humidity, the stronger the photosynthesis of plants and the more CO2 gas they need. Therefore, using the CO2 detector analysis, when the sunlight intensity at sunny noon is high, the temperature inside the plastic greenhouse is high. CO2 gas fertilizer should be applied more, and the concentration should be controlled between 1000-1500 ppm. In the morning or in the afternoon, when the sun is weak and the temperature is low in the big urn, CO2 gas fertilizer should be used less, and the concentration should be between 500-800ppm. In cloudy or rainy weather, there is no sunlight. Carbon dioxide gas fertilizer should not be added.
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