There are many ways to determine soil moisture: titration, weighing, capacitance, resistance, microwave, neutron, Karl Fischer, gamma ray, nuclear magnetic resonance, time domain reflectometry (TDR), gypsum , infrared remote sensing method and soil moisture measuring instrument method. Different methods, their ease of use, and the accuracy of soil moisture determination vary. Soil moisture is the most important source of plant water, and its content is directly related to whether we need irrigation, the growth rate and results of the crop. The absorption of organic matter by plants also requires the participation of water in the plant. Therefore, the measurement of soil moisture is very important. Many countries have conducted in-depth understanding of soil moisture, such as the United States, Australia and other developed countries, but also at no cost to increase the research on soil moisture. Domestically, from the 1950s onwards, we have also conducted detailed and in-depth studies on soil moisture and have begun to form a relatively complete theoretical system. Gasoline Generator,Petrol Generator For Sale Power,Petrol Portable Generator Price,Power Generator Natural Gas Haiweineng Electrical Machinery Co., Ltd. , http://www.bgdieselgenerator.com
Below we discuss two methods to deepen the measurement of soil moisture.
Drying method: Drying method is a relatively simple method, and it is also the most common method for measuring soil moisture. It is also one of the standard methods. The specific operation is as follows: A certain amount of soil is taken from the field, weighed with a balance, and then placed in an oven at 105°C (evaporation temperature of the water is 100°C), waiting for drying. Where it is judged that there is a laboratory standard for drying, it is generally the case that the measured weight does not exceed one value before and after twice. Weigh again after drying. The difference in weight between the two before and after is the content of soil moisture. The calculation formula is soil moisture content = W/M*100%, M is the soil weight before drying, and W is the soil moisture weight, ie the difference between M and the soil weight after drying M'.
Soil moisture measuring instrument method: more than soil moisture analyzer to determine soil moisture, in addition, such as soil moisture temperature tester, soil moisture detector, etc. can measure the soil moisture. The soil moisture temperature quick-measuring instrument is a multi-functional instrument. It is also used to measure the soil temperature while measuring soil moisture. It is a soil moisture measuring instrument and is more suitable for long-term recording and comparison of the same monitoring point. The soil moisture analyzer emits electromagnetic waves of a certain frequency through the instrument. The electromagnetic waves propagate along the probe, return to the bottom, and measure the output voltage of the probe. Because the change of the dielectric constant of the soil depends on the moisture content of the soil, the relationship between the output voltage and moisture The soil moisture content can be calculated. The soil moisture analyzer produced by Zhejiang Top has powerful data storage space, can record 2000 sets of data at the same time, and can be connected to a computer and import the data into a computer. In addition, it can also carry GPS function to measure soil moisture. The longitude and latitude of the measured point are displayed in real time to facilitate comparison of spatial differences.
Although the drying method and the soil moisture meter method are two distinctly different measurement methods, only one result is set for measuring the soil moisture content.
What is the difference between drying method and soil moisture meter method?