基于浓度-吸光值函数预测土壤速效钾占比数据

土壤速效钾是指土壤中易被作物吸收利用的钾素，是表征土壤钾素供应状况的重要指标之一，及时测定和了解土壤中速效钾占比情况及其变化，对指导钾肥的施用是十分必要的。另外按照土壤样品号结合地理信息系统（GIS）技术，将各地点的土壤数据和信息进行深度整合和分析，绘制土壤速效钾占比地图，以直观的可视化形式呈现给用户。土壤速效钾浓度-吸光值函数是用于检测土壤中速效钾占比的方法，它是基于测定不同浓度的速效钾溶液在相同条件下吸收光谱从而测定钾离子的原理制成的。首先，包括4个标准点分别为2g/L、3g/L、5g/L和10 g/L，用原子吸收分光光度计测量出这4个标准点的吸光值‌，从而可以确定出浓度-吸光值函数（Y=12.81*X-1.165，其中X为速效钾溶液浓度，Y为吸光值)；其次，将土壤样品重量为AKg配制成10L的速效钾溶液，再用原子吸收分光光度计测量出该溶液的吸光值Y1，根据第一步得出的浓度-吸光值函数反推算出速效钾溶液浓度X1；最后，速效钾在土壤中的占比=速效钾的重量/土壤样品重量=10*X1/（A*1000）。Soil available potassium refers to the potassium fraction readily absorbable and utilizable by crops, and is one of the important indicators characterizing the potassium supply capacity of soil. Timely determination and understanding of the proportion and dynamic changes of soil available potassium are of great necessity for guiding potassium fertilizer application. In addition, by combining soil sample IDs with Geographic Information System (GIS) technology, in-depth integration and analysis of soil data and information from various locations can be performed, and maps of soil available potassium proportion can be drawn to present intuitive visual results to users. The soil available potassium concentration-absorbance function is a method for detecting the proportion of available potassium in soil, which is developed based on the principle of quantifying potassium ions by measuring the absorption spectra of available potassium solutions with different concentrations under identical conditions. The specific operational steps are as follows: First, four standard points with concentrations of 2 g/L, 3 g/L, 5 g/L, and 10 g/L are prepared. The absorbance values of these four standard points are measured using an atomic absorption spectrophotometer, so that the concentration-absorbance function can be established as Y=12.81*X - 1.165, where X represents the concentration of the available potassium solution, and Y represents the absorbance value. Second, a 10 L available potassium solution is prepared using a soil sample weighing A kg, and the absorbance value Y1 of this solution is measured via an atomic absorption spectrophotometer. The concentration X1 of the available potassium solution can be back-calculated based on the concentration-absorbance function obtained in the first step. Finally, the proportion of available potassium in soil is calculated as: proportion of available potassium in soil = weight of available potassium / weight of soil sample = 10*X1/(A*1000).

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该数据集包含9243条记录，用于预测土壤速效钾占比，主要应用于农业领域，通过浓度-吸光值函数和GIS技术指导钾肥施用和绘制土壤速效钾占比地图。数据每年更新一次，包含土壤样品号、重量、光度计型号、吸光值等关键字段。