Technology

Soil conductivity sensor-soil EC sensor-soil sensor

soil EC sensor refers to the ability of soil to conduct electrical current, as measured by the conductivity of soil extracts. The measurement results were expressed in mS/m (10μS/cm). When the determination result is greater than or equal to 100mS/m (i.e. 1000μS/cm), retain three significant digits; When the measurement result is less than 100mS/m, keep to one decimal point.

Soil conductivity is the sum of anions and cations in soil extract and represents the salt content of the soil. The measurement of soil conductivity can directly reflect the content of soil mixed salt, which is of great significance to determine the difference of spatial and temporal distribution of various field parameters, thus laying a foundation for the popularization of modern fine agriculture based on information and knowledge.

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The national standard HJ 802-2016 “Soil Conductivity Measurement Electrode Method” gives the determination method of soil conductivity, which requires taking naturally air-dried soil samples, adding water in a ratio of 1:5 (m/V) (conductivity is not higher than 0.2ms /m, that is, 2μS/cm), and shaking extraction under the condition of 20℃±1℃. Then the conductivity of the extract was measured at 25℃±1℃ with a conductivity meter. It should be noted that when the conductivity of the soil extract is less than 1mS/m (10μS/cm), carbon dioxide and ammonia in the air have a great influence on the conductivity measurement. The interference can be eliminated or reduced by operating in a small closed space.

soil EC sensor

Soil conductivity is to show the conductivity of soil in a specific numerical way.

Which can reflect the water and salt conditions of the soil to be measured. Soil contains a lot of conductive ions, which are also nutrients needed by crops. So the researchers studied the relationship between soil conductivity and soil fertility, salt content, and crop yield.

Soil conductivity plays a guiding role in plant fertilization. Nutrients that plants need are often added with compounds, such as ammonium nitrate for nitrogen. That microbes break down for the plant to use.

Soil conductivity also reflects the actual condition of soil salt under a certain moisture condition. The more dissolved salts, the greater the conductivity of the solution. Therefore, soil salinity can be indirectly reflected by measuring soil conductivity, thus providing guidance for fertilization management. The total soil salt content increases year by year, resulting in soil acidification. This is mainly because, on the one hand, perennial or seasonal soil mulching changes the high temperature in the natural state. Which is a lack of rain leaching and intense evaporation. The soil cannot be fully washed by rain, resulting in the accumulation of salt on the surface of the soil. On the other hand, it is also caused by unreasonable fertilization.

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1. Soil organic matter

Soil organic matter is an important index to evaluate soil fertility and the content of soil organic matter is closely related to soil fertility level. Although organic matter accounts for only a small part of the soil total, it plays a significant role in soil fertility in many aspects. Under the same or similar conditions, the content of organic matter is positively correlated with soil fertility level within a certain content range.

2. Soil pH value

Ph has a great impact on soil fertility and plant growth, as well as on the availability of nutrients. Such as phosphorus in neutral soil. The availability of trace elements (manganese, copper, zinc, etc.) in alkaline soil is poor. In agricultural production, we should pay attention to the ph of the soil and take active measures to adjust it.

Ph has a great impact on soil fertility and plant growth, as well as on the availability of nutrients. Such as phosphorus in neutral soil. The availability of trace elements (manganese, copper, zinc, etc.) in alkaline soil is poor. In agricultural production, we should pay attention to the ph of the soil and take active measures to adjust it.

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3. Soil cation exchange capacity (CEC)

Soil cation exchange capacity, CEC, refers to the total amount of various cations absorbed by soil colloids. And its value is expressed by the number of substances containing various cations per kilogram of soil. Its value represents the soil’s capacity to retain fertilizer. The higher the cation exchange capacity, the stronger the soil fertility. The value of cation exchange capacity can guide us to choose the appropriate amount and frequency of fertilization.

Soil temperature has a great influence on crop growth, microbial activity, the transformation of various nutrients. Evaporation and movement of soil water. Within a certain temperature range, the higher the soil temperature, the faster the crop growth and development; The soil temperature is too low, the microorganism activity is weakened, the organic matter is difficult to decompose. The root respiration of crops is reduced, resulting in the lack of nutrients of crops, the growth becomes slow.

Soil conductivity is used to describe soil salinity, which contains abundant information reflecting soil quality and physical properties. For example, soil salinity, moisture, temperature, organic matter content, and texture all affect soil conductivity to varying degrees. It is of great significance to obtain soil conductivity values effectively for determining the spatial and temporal distribution differences of various field parameters.

The low or high content of trace elements in the soil is not conducive to plant growth. For example, when excessive phosphate fertilizer is applied to the soil. Phosphate ions in phosphate fertilizer combine with cations such as calcium and magnesium in the soil to form insoluble phosphate. Which not only wastes phosphate fertilizer but also destroys the soil aggregate structure, resulting in soil compaction.

A soil tachometer is a sensor for the rapid detection of soil components.

Which can accurately detect soil temperature and humidity. Soil conductivity and soil nitrogen, phosphorus, and potassium components in real-time. The soil composition index plays a very important role in the growth of crops. The use of a detector can accurately detect soil temperature and humidity to judge soil moisture. Understand whether the soil needs watering. Determine whether to fertilize crops by monitoring soil nutrients such as nitrogen, phosphorus, and potassium levels.

Traditional non-destructive soil moisture measurement methods are based on the use of neutron probes. And are used at a low frequency under the action of gamma rays (1). The conductivity of soil water can be determined by sampling soil and measuring the conductivity of saturated dextral (2). Time-domain reflectometry (TDR) is a relatively new method for measuring volumetric water content in porous media.

The aim of this study was to determine the heating temperature of the transmitted. Signal transmitting medium could be used to measure low salinity. If the transmission time and the attenuator measurement are completely independent, the conductivity and additional electric constant can be measured simultaneously.

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