The most difficult to calculate in the regression equation method is the calculation of that coefficient. At the same time, the coefficient of each plant is different. The difference in planting fields of the same variety also leads to differences in coefficients. Therefore, each time the regression equation method is used. The coefficient is calculated when calculating the leaf area of ​​a new species. The conversion method of this coefficient is: input the leaf area measured by the leaf length × leaf width and the handheld leaf area meter into the computer DPS data processing system for regression analysis, and obtain the regression equation of the measured plant. Regression equations are used to know the fixed coefficients, and then all the measurement results are compared and analyzed to see if there is a certain linear relationship between the data and the actual measurement results. If there is a linear relationship, the regression equation has a certain degree of accuracy. .
By using the regression equation method and other several measurement methods to compare, it was found that the traditional measurement method is time-consuming and labor-consuming, and it needs to be measured in vitro, which is more destructive to plants. Live measurement method using handheld leaf area meter method to measure the accuracy of the comparison is high, but the instrument needs to spend a certain amount of money to purchase, and the use of CAD graphics analysis, high accuracy, adaptability, but the measurement The result may be affected by the accuracy of the blade itself and the viewing angle of the camera. However, when using the regression equation method to measure, the results are very different, the measurement accuracy is high, and the cost of the funds is low. The labor and material resources used for the measurement are relatively low.
Lead Stearate is white powder, insoluble in water, soluble in hot ethanol, benzene and turpentine, dissolved by heating in organic solvents and becomes gelatinous after cooling, decomposed into Stearic Acid and corresponding salt when meeting strong acid, with hygroscopicity. Lead stearate can be used as heat stabilizer and lubricant of Polyvinyl Chloride, with good lubricity and light and heat stability. It has good synergistic effect when used with cadmium soap, barium soap or organic tin compounds, and can be used in various opaque hard and soft PVC products, such as hard pipes, hard boards, sheets, films and artificial leather, especially for wire and cable materials, which can give the products excellent electrical properties. It is also used as anti-sedimentation agent for paints, water-releasing agent for fabrics, thickening agent for lubricants, heat-resistant stabilizer for plastics, etc. It is used as stabilizer for opaque soft and hard PVC products.
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