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What are the key points when choosing a soil temperature and humidity sensor?
The temperature and humidity of the soil provide a vital role for the growth of plants. Soil temperature has a great influence on crop growth, soil microbial activities, conversion of various nutrients, soil water evaporation and movement. For general soil microbial life, the suitable soil temperature is 25℃~37℃, the lowest is 5℃, and the highest does not exceed 45℃~50℃. Within a certain temperature range, the higher the soil temperature, the faster the growth and development of crops; if the soil temperature is too low, microbial activity is weakened, organic matter is difficult to decompose, and the root respiration of crops is reduced, resulting in crop nutrient deficiency and slower growth. Soil moisture refers to the condition of soil moisture content. Soil moisture directly affects the growth quality and speed of crops. In the planting industry, crops cannot directly obtain the inorganic elements in the soil by themselves, and the water in the soil acts as a solvent to dissolve these inorganic elements. The crops absorb soil water through the root system to obtain nutrients and promote growth. Therefore, precipitation or irrigation must be converted into soil. Water can be absorbed by plants. Therefore, it is necessary to provide a suitable temperature and humidity environment for plants. The soil temperature and humidity sensor can monitor the temperature and moisture of the soil to monitor the growth environment of plants. How to choose a temperature and humidity sensor? 1. Soil temperature and humidity sensors are often used outdoors, so strict manufacturing processes must be adopted to conduct waterproof and dustproof treatment on the entire body to ensure stable monitoring of components. The protection level is IP68 to ensure that the body is waterproof and anticorrosive. 2. The sensor needs to insert the probe into the soil for measurement, so the requirements for the probe are also very high. Austenitic 316 stainless steel probe, rust-proof, non-electrolytic, resistant to salt and alkali corrosion, suitable for all kinds of soil. 3. The sensor chip is very important to data processing, so pay attention to the type of sensor chip. MCU's high-quality operational amplifier ensures low power consumption, high sensitivity, and stable signal transmission of the sensor. 4. Airtight performance. The high-density epoxy resin vacuum irrigation is used between the probe and the body to prevent water from entering the body to a large extent, and the sensor has high sealing performance. The soil temperature and humidity sensor adopts a probe plug-in design to ensure accurate measurement, high accuracy, fast response, good interchangeability, and reliable performance. It has a built-in temperature compensation sensor with a compensation range of 0-50°C. In addition, in the actual measurement, we should pay attention: in the long-term observation, the measured value after irrigation or rainfall is closer to the true level. If you perform a quick test, you can water the soil to be tested first, and then perform the measurement after the water is fully penetrated. If you are measuring on a hard surface, you should drill a hole first (the hole diameter should be smaller than the probe diameter), then insert it into the soil and compact the soil before measuring. Two quick measurement methods:Quick measurement: select a suitable measurement location, avoid rocks, ensure that the steel needle does not touch hard objects, and throw according to the required measurement depth Open the surface soil, keep the original tightness of the soil below, hold the sensor vertically and insert it into the soil. Do not shake left and right when inserting. It is recommended to measure multiple times within a small range of a measuring point to find the average value. Long-term measurement: Vertically dig a pit with a diameter of>20cm, insert the sensor needle horizontally into the pit wall at a predetermined depth, and fill the pit tightly. After a period of stability, it can be carried out for several days, months or even more. Long-term measurement and recording. At present, soil temperature and humidity sensors are widely used in scientific experiments, water-saving irrigation, greenhouses, flowers and vegetables, grassland pastures, soil rapid measurement, plant cultivation, sewage treatment, grain storage, and various particulate water content and temperature Measurement. In agricultural production, real-time monitoring of soil moisture by using soil temperature and humidity sensors helps us understand the conditions of various soil parameters in time, and adopts scientific and reasonable irrigation methods based on the growth of plants, which can save water Resources; timely and appropriate irrigation can not only protect the land, but also increase the area and yield of planting plants, improve the efficiency of irrigation, and promote the high yield of plants in the irrigation area, which is of great benefit to increasing the yield of crops.
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