Crops, plants, and fruit trees must start with sowing or seedlings until they mature, and they must have a certain percentage of soil moisture in order to have sound growth and development. The so-called soil moisture is the usual lyricism.

The expression of soil moisture is expressed as the proportion of water contained in the soil, that is, the percentage of soil moisture contained in the soil. For example, there are 1.1 pounds of wet soil, of which there are 1 two water, 1 kg dry soil, then its moisture content is 10%.

In the past, the method of determining the soil moisture content was the simplest and most commonly used method of frying and soiling, but it was a waste of time.

Frying ground method: the soil sample taken from the field, weighing wet soil, and then placed in a wok. With a soft fire, stir it at any time to avoid frying. After frying dry, weigh it once more. Wet soil weight minus dry soil weight, to obtain soil moisture content. The soil moisture content was removed by dry soil and then multiplied by 100 to obtain the soil moisture percentage. In order to make the calculations accurate, the fried soil must be dried thoroughly. When the soil is about to fry, it is said twice every 10 minutes and the weight is similar.

Earthing method: Put some sand in a large pot and put the iron box with the soil sample on the sand for heating and baking. Check the soil is dry, in addition to using the above test method, but also in the earth box cover a piece of glass, such as the appearance of anhydrous beads on the glass, proved to be dry. Determination of lyrical conditions is generally performed at 8 and 9 am. The sample for soil sampling should be representative. The depth of observation can be determined according to the production requirements.

Now, with the portable soil moisture meter, it only needs to insert the water meter into the soil to detect the moisture content of the soil within 10 minutes faster and more concise than the method of grounding and soiling. The portable soil moisture meter will emit a signal at a certain frequency. The signal is transmitted by the source probe and reaches the soil end. Some of the signal is reflected back to the transmission line due to impedance mismatch, thus forming a standing wave superposition with the original signal because the reflectivity depends on the soil. The dielectric constant of the soil, and the dielectric constant of the soil has a linear relationship with the moisture content of the soil, so that the standing wave superposition signal can be detected to obtain the soil moisture content. The portable soil moisture meter can control the distribution of soil moisture (water content) through the GPS positioning system and provide scientific basis for the differential water-saving irrigation. At the same time, accurate water supply is also beneficial to increase crop yield and quality.

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