Analysis of soil nutrient comprehensive evaluation system
Soil resources are an important factor in the geographical environment and are also the basis of agricultural production. Therefore, understanding the quality of soil resources can provide a basis for maintaining and fertilizing the soil and rationally using the soil. In the determination of soil quality, soil nutrients are one of the important indicators. In terms of soil nutrient evaluation, there are two kinds of qualitative description and quantitative description. Qualitative description has been very insufficient, while the traditional quantitative description has a large subjective randomness. This paper intends to use a comprehensive evaluation method of fuzzy data to evaluate soil nutrients in an attempt to achieve objective and scientific purposes to demonstrate the applicability of this quantitative evaluation method in soil nutrient evaluation.
The comprehensive evaluation method of fuzzy data adopted by the institute has been applied to the soil nutrient tester of soil monitoring instruments. Compared with the traditional “weight-index sum†method, the quantification of factors is more accurate and reliable. In the traditional evaluation method, each participating factor is usually divided into ranks, and certain numerical values ​​and weights are directly given, and the final score is calculated and then the rating of the unit is evaluated. The evaluation method of this paper firstly establishes the membership function of each participating factor, assigns the evaluation factor to the membership degree calculated by the membership function, so the final evaluation value of each evaluation unit is actually the comprehensive recording degree of the evaluation unit. .
This evaluation value not only reflects the relative relationship between the evaluation units, but also directly reflects the absolute rating of each evaluation unit. This can not be done directly in the traditional evaluation method, because the evaluation value reflects only the relative amount between the evaluation units, and can only be reflected after the comparison of the evaluation values ​​of the evaluation units. In addition, the fuzzy comprehensive evaluation method can be used not only for the comprehensive evaluation of soil nutrients, but also for the quantitative evaluation of natural environmental factors such as soil quality and soil suitability.
Related instruments Soil moisture detector Soil drought monitoring system
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