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What is soil moisture? What is the significance of the analysis of soil moisture? In the course of long-term agricultural construction, the soil moisture content is the soil moisture status, and it is also the most important and most commonly used soil information. For the analysis of soil moisture, scientific control and water use provide basic data, which is an important information for drought relief work. The monitoring of soil moisture content is indispensable in a variety of agricultural water and soil engineering management, agricultural testing, agricultural meteorology, irrigation management and drought monitoring. There are various methods at home and abroad for the monitoring of soil moisture. Under the footsteps of scientific and technological development in recent years, various types of instruments have been gradually developed.
Recently, some domestic products have also been developed, such as precision soil moisture detectors, soil moisture sensors, and intelligent soil moisture testers, which have made up for this lack of domestic demand. Water sensor according to the display mode to divide. Can be divided into two categories: First, the direct display mode is the second sensor. The soil moisture meter is a testing instrument developed on the basis of this type of sensor.
The direct display mode can be divided into three types: one is the suction negative pressure gauge display type (also called negative pressure tension gauge); the second is the electrical contact vacuum gauge display type, which is commonly used in the alarm type moisture sensor; and the third type is the U type. Mercury column display type. Among the three direct display methods, the accuracy of the U-shaped mercury column display is the highest, the reading is the most accurate, the error is the smallest, and it can be accurate to the millibar. The disadvantage is that in the use of farmland, when the U-shaped pipe breaks, mercury will pollute the farmland and cause environmental pollution. The choice of three display modes is often selected according to the user's specific requirements.
The secondary sensing display type converts pressure readings from direct display sensors to moisture content. For example, the U-tube mercury indicator can be replaced with a digital soil moisture measuring device using a piezoresistive sensor as the secondary sensor. It can be digitized and directly display the soil suction value of the sensor. Secondary sensing can also be used to remotely measure soil water potential. For example, a soil moisture meter (sensor part) is embedded in the depth of soil required by the field, and the negative pressure of the soil water is absorbed through the water film inside the porous clay probe. Pass, make the moisture sensor produce the negative pressure, this negative pressure passes the piezoresistive sensor electric current to transmit the secondary sensor, give out an electric signal, transmit to the far-end telemeter temperature instrument through the wire, can use the interface line to convey to the computer, thus Complete telemetry of the soil water potential in the field. However, the use of negative pressure tensiometer can only measure the low suction range. When the suction is high, the clay head will be “penetrated†by air, so the soil water potential of high suction conditions cannot be measured.
Sensor method for determining soil moisture has the advantages of field in situ measurement, rapid direct reading, no damage to soil structure, low price, no radioactive material, safety, reliability, long-term observation, and accumulation of field water potential data. In particular, the secondary sensor has the advantages of digitization, and can be connected with a computer interface to enable soil moisture measurement to be automatically monitored. As a modern measurement method, soil moisture meter has become a new trend in soil moisture measurement methods.
The accuracy of the soil moisture tester, which uses the sensor as the main component, is also different during the test, mainly because the selected sensor is different. Therefore, in the purchase of soil moisture tester must be based on their own choices suitable for the actual situation.
Recently, some domestic products have also been developed, such as precision soil moisture detectors, soil moisture sensors, and intelligent soil moisture testers, which have made up for this lack of domestic demand. Water sensor according to the display mode to divide. Can be divided into two categories: First, the direct display mode is the second sensor. The soil moisture meter is a testing instrument developed on the basis of this type of sensor.
The direct display mode can be divided into three types: one is the suction negative pressure gauge display type (also called negative pressure tension gauge); the second is the electrical contact vacuum gauge display type, which is commonly used in the alarm type moisture sensor; and the third type is the U type. Mercury column display type. Among the three direct display methods, the accuracy of the U-shaped mercury column display is the highest, the reading is the most accurate, the error is the smallest, and it can be accurate to the millibar. The disadvantage is that in the use of farmland, when the U-shaped pipe breaks, mercury will pollute the farmland and cause environmental pollution. The choice of three display modes is often selected according to the user's specific requirements.
The secondary sensing display type converts pressure readings from direct display sensors to moisture content. For example, the U-tube mercury indicator can be replaced with a digital soil moisture measuring device using a piezoresistive sensor as the secondary sensor. It can be digitized and directly display the soil suction value of the sensor. Secondary sensing can also be used to remotely measure soil water potential. For example, a soil moisture meter (sensor part) is embedded in the depth of soil required by the field, and the negative pressure of the soil water is absorbed through the water film inside the porous clay probe. Pass, make the moisture sensor produce the negative pressure, this negative pressure passes the piezoresistive sensor electric current to transmit the secondary sensor, give out an electric signal, transmit to the far-end telemeter temperature instrument through the wire, can use the interface line to convey to the computer, thus Complete telemetry of the soil water potential in the field. However, the use of negative pressure tensiometer can only measure the low suction range. When the suction is high, the clay head will be “penetrated†by air, so the soil water potential of high suction conditions cannot be measured.
Sensor method for determining soil moisture has the advantages of field in situ measurement, rapid direct reading, no damage to soil structure, low price, no radioactive material, safety, reliability, long-term observation, and accumulation of field water potential data. In particular, the secondary sensor has the advantages of digitization, and can be connected with a computer interface to enable soil moisture measurement to be automatically monitored. As a modern measurement method, soil moisture meter has become a new trend in soil moisture measurement methods.
The accuracy of the soil moisture tester, which uses the sensor as the main component, is also different during the test, mainly because the selected sensor is different. Therefore, in the purchase of soil moisture tester must be based on their own choices suitable for the actual situation.
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