Comparison of Drying Method and Multiparameter Soil Measuring Instrument Method

Drying method and multi-parameter soil measuring instrument method are methods to determine soil moisture, and they are the most frequently used methods. The drying method is a laboratory standard, and it is a rule that has always depended on us to measure the accuracy of the instrument. The multi-parameter soil measuring instrument method is an instrument method. With the continuous development of scientific instruments, agricultural instruments are becoming more and more complete. Soil moisture and soil nutrient measuring instruments specially designed for soil research are also emerging. The wireless public opinion and drought management system, the fixed-point public opinion monitoring system and other instruments are all developed in recent years and have been highly evaluated. The fixed-point public opinion monitoring system has 32 channels and detects the water content of six different depths at the same time. It has been widely used in agriculture, especially in the study of soil moisture changes at different depths. 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 multi-parameter soil measuring instrument method. 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.

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 105Â°C (evaporation temperature of the water is 100Â°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'.

Multi-parameter soil measuring instrument method: A multi-parameter soil measuring instrument for measuring soil moisture, and other wireless soil moisture and drought management systems, fixed-point public opinion monitoring systems and the like can measure soil moisture. The wireless public opinion and drought management system is applicable to the latest public opinion monitoring standard SL000-2005, and can be flexibly configured according to user requirements. A single system can implement up to 60 monitoring points to perform simultaneous six-point simultaneous detection. System customization is convenient and flexible, and the data sampling period can be set flexibly (10 seconds to 30 days). The system can store 500,000 records. The multi-parameter soil measuring instrument is not only capable of measuring soil moisture but also simultaneously measuring parameters such as soil temperature, atmospheric temperature, and atmospheric humidity, and is a multifunctional instrument. Among them, the multi-parameter soil measuring instrument produced by Top, Zhejiang, carries the GPS function. While measuring the soil moisture, the longitude and latitude of the measured point are displayed at the same time, which is conducive to the spatial difference comparison.

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