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How does the soil moisture monitoring system perceive changes in soil moisture?

by:Rika Sensors     2021-09-26
How does the soil moisture monitoring system perceive changes in soil moisture?
Soil moisture is the soul of agricultural conditions, and soil moisture monitoring is an important basic and public welfare function of agricultural technology promotion. It plays an important role in ensuring the health of the country's food and promoting the development of water-saving agriculture.

Moisture refers to the humidity of the soil suitable for plant growth and development. Moisture refers to the condition of soil moisture. Soil moisture is the degree of soil dryness and wetness, that is, the actual soil moisture content, which can be expressed as the percentage of soil moisture content in the dry soil weight: soil moisture content u003d moisture weight / dry soil weight × 100%. It can also be expressed as a percentage of soil water content equivalent to field water holding capacity, or relative water content such as a percentage of saturated water content.

In the past, my country’s traditional crop monitoring relied on manual field surveys, and each crop production site had multiple survey and monitoring points. And manual monitoring has many shortcomings: First, it is slow and unable to grasp the relevant situation in time; second, it is not very accurate to estimate and guess based on experience. Especially in the case of major meteorological disasters such as low temperature and drought, the technical measures adopted inevitably lag behind because of slow predictions.

Commonly used manual judgment method:

Saturated soil (water content 18.5%-20%), the soil is dark and dark, it can be kneaded into a ball by hand, and it can be rolled into a strip. There are obvious water marks on the hands, and fullness is the upper limit of suitable cultivation.

Suitable moisture content (15.5%~18.5% water content), the earth color is dark and dark, the hands are squeezed into a ball, thrown to pieces, and there are wet marks on the hands. Suitable moisture is the moisture suitable for sowing and farming, and the effective moisture content is relatively high.

Yellow soil (water content 12%-15%), the earth color is yellow, the hands are crumbly, fragile, and the hands have a cool feeling. Yellow soil is suitable for farming, with less effective water content, uneven seedling emergence, and irrigation is required.

Dry soil (moisture content below 8%), the color of the soil is gray and white, the soil is hard and the fine soil is loose. Dry soil has no water that can be absorbed by crops and is not suitable for farming and sowing.

Nowadays, soil moisture monitoring is the promotion of new water-saving agriculture technology, and it is also a key technical link to realize scientific and effective water use. Doing a good job of moisture monitoring is one of the important means to prevent drought and promote the green and sustainable development of agriculture. It is also a key link in the development of water-saving agriculture and the basic support for the construction of modern agriculture. Through vigorously carrying out monitoring of soil moisture and drought, especially during important farming periods and key growth periods of crops, combined with the law of crop water demand and local water resources, scientific and reasonable irrigation measures have been formulated to provide water-saving irrigation, drought prevention and drought relief. Scientific basis.

The soil moisture monitoring system consists of a data acquisition module, a data transmission module, and a database. This kind of soil moisture monitoring system can realize long-term continuous monitoring of soil moisture (soil moisture, soil temperature).

Soil moisture monitoring is mainly based on the sensor emitting electromagnetic waves of a certain frequency. The electromagnetic waves are transmitted along the probe and return after reaching the bottom to detect the voltage output by the probe. Because the change of soil dielectric constant usually depends on the soil moisture content, The relationship between output voltage and moisture can calculate the soil moisture content. Moisture is the main factor that determines the dielectric constant of the soil. Measuring the dielectric constant of the soil can directly and stably reflect the true moisture content of various soils. The monitoring data is uploaded to the environmental monitoring cloud platform through GPRS/4G, RS485, etc., and the data is analyzed, so that managers can better observe the changes in soil moisture and achieve unified management of soil moisture in the field.

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