Agricultural production is inseparable from the climatic environment. Monitoring changes in the environment from time to time, and accurately grasping agricultural time are crucial to ensure agricultural harvest. In recent years, with the continuous development of modern science and technology, the current facility agriculture has become a new agricultural industry to solve the above-mentioned key issues. Facility agriculture is a new agricultural production method that regulates and controls the environmental conditions of crop production through the use of greenhouses and its supporting devices. It is an effective means to free agriculture from natural constraints, is a revolutionary development of conventional agriculture, and is highly productive, efficient, high-quality, and technology-intensive. Type of agriculture. For example, Israel, the Netherlands, and other countries have achieved very high levels of research and production in facility agriculture. However, in facility agriculture, how to obtain information to regulate the growing environment of crops is extremely important. Among them, information acquisition means in key technologies is one of the most important key technologies. Therefore, it is imperative to develop a facility agricultural sensor with a high cost performance ratio.
Ultrasonic sensor technology is the development direction of the new century, and the sensor is widely used in agriculture. In agricultural production, certain combinations of light, heat, water, and gas in the natural world are favorable to a certain production, and an effective agricultural natural resource is formed. Crop production requires proper temperature and humidity, and the sensor can collect and control temperature and humidity parameters in the greenhouse to make it more in line with crop development needs. Secondly, the sensor can detect the dryness of soil to guide agricultural irrigation and ensure the growth of crops while saving water resources. Dryness sensors can generally be used for soil testing. Photosynthesis is essential for the growth of crops, so it is necessary to control the illuminance in the greenhouse. The use of light sensors can control the intensity of artificial light and create a good environment for growth. Photosynthesis also requires the participation of carbon dioxide, so gas sensors can be used to control the concentration of carbon dioxide in greenhouses and help grow crops. Biosensors can also be used to detect soil nutrients such as organic matter, pH, nitrogen, phosphorus, potassium, and exchangeable calcium and magnesium to increase crop yields. This makes the sensor gradually applied in the facility agriculture, and its importance is constantly highlighted.
In addition to light, heat, water and gas in the natural world, it is beneficial to agricultural production. In addition, wind is also one of the environmental factors of agricultural production. China's prevailing monsoon is good for crop growth. In the Inner Mongolia Plateau, the northeastern plateau, the southeastern coast, and the inland mountains, there are abundant wind energy resources that can be used for energy development. The moderate wind speed plays an important role in improving the environmental conditions of farmland. Near-ground heat exchange, farmland evapotranspiration, and transport of carbon dioxide and oxygen in the air are accelerated or enhanced as the wind speed increases. Wind can spread plant pollen and seeds and help plants pollinate and reproduce. Wind energy is a widely distributed, inexhaustible source of energy. However, all things have a negative effect on agriculture will also have a negative effect. It not only spreads pathogens but spreads plant diseases. High-altitude winds are also the weather conditions for the long-range migration of pests such as armyworm, rice planthopper, rice leaf roller, and earthworm. The strong wind caused mechanical abrasion of the leaves, lodging of the crops, broken trees, and falling fruit, which affected the yield. Not only such high winds can also cause soil erosion, sand dunes, and destroy farmland.
In the drylands, blindly reclamation, the wind will lead to the desertification of the land. High winds and snowstorms in the pastoral areas can blow away herds and increase freezing damage. The special nature of local winds also often causes wind damage. Tidal winds with high salinity, high-temperature and low-temperature fumes and dry hot winds from the sea have all seriously affected the flowering of fruit trees, fruit set, and grouting of cereal crops. In order to prevent wind damage, we often use dwarf-resistant, lodging-resistant, and friction-resistant wind-resistant varieties. Creating windbreaks and setting windbreaks are effective windbreaks.
Normal winds are very useful for agricultural production, so measuring wind speed and wind direction will also greatly help agriculture. Therefore, it is necessary to conduct timely monitoring of agricultural meteorology and environment. The sensors used in the monitoring mainly include air pressure sensors composed of capacitive or strain sensors, wind direction sensors composed of resistive sensors, and wind speed sensors constructed based on the principle of heat transfer or differential pressure. A common sensor that can continuously measure wind speed and air volume (air volume = wind speed x cross-sectional area) is an important device for measuring wind parameters of an agricultural climate automatic monitoring station.