Abstract
In this paper, we report a simple but effective algorithm to estimate the undetermined coefficients in the formula of soil water electrical conductivity value by the soil apparent electrical conductivity method. By doing so, the coefficients can be accurately obtained to further calculate the soil water electrical conductivity. According to the process of calculating the soil solution electrical conductivity based on the apparent conductivity of soil, the error of the calculation equation is effectively calculated by the two order curve fitting method. Meanwhile the genetic algorithm is adopted to reduce the influence of the data error generated by the proposed algorithm, and improve the accuracy of the data as well. The experimental results demonstrate that the solution by the proposed algorithm can be effectively obtained and the error change is in one direction simultaneously. With these advantages, we can use soil water electrical conductivity to calculate the content of soil salt.
Highlights
There are many factors that affect the apparent conductivity of soil, such as soil salt content, water content, temperature, organic matter content and geological structure [1]
The soil salinity is directly evaluated by the soil water electrical conductivity, and the relationship in ECaECw θ is the theoretical basis for the estimation of the soil salinity
To overcome the drawbacks of the above algorithm, this paper presents the application of genetic algorithm to calculate the formula of the soil water electrical conductivity
Summary
There are many factors that affect the apparent conductivity of soil, such as soil salt content, water content, temperature, organic matter content and geological structure [1]. By the composition of the soil, the soil apparent conductivity is mainly composed of the soil surface electrical conductivity and the soil water electrical conductivity [2]. According to Ref [3], the analytical relationship between the soil apparent conductivity ECa and the soil water electrical conductivity ECw is as follows: ECa ECs TT ECw where ECS is the soil surface electrical conductivity (mS/m). This paper mainly rsearches the estimation of the undetermined coefficients in the formula of soil solution conductivity, so that the estimated coefficients can be more accurate to calculate the soil water electrical conductivity
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