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目前比较常用的叶面积测定方法中,以叶面积仪、求积仪和计算纸法测量精度最高,而以校正系数法最为简便,易于大范围推广使用。马铃薯由于叶片多且规则程度较差等原因,尚未有简便易行的类似于小麦等作物的叶面积校正系数见报,造成了马铃薯叶面积测定实际操作时难度及误差较大。本文通过试验研究,以计算纸法测定值为标准,确定了马铃薯叶面积另外三种不同测定方法的校正系数:长宽积法叶面积校正系数K为0.76,该方法简单易行、便于推广;机械式求积仪叶面积测量结果为实际面积的92%,测量值需乘以1.09得到比较真实的面积,仪器操作过程繁琐,不便使用;SHY-150型扫描式活体面积仪测量值仅为实际面积的71%,测定值需乘以1.40得到实际面积,由于其价格昂贵、加之对操作过程要求较高容易产生人为误差等原因,影响普遍使用。
Currently more commonly used method for the determination of leaf area, the leaf area meter, plotter and calculate the highest accuracy of the paper method, and the most convenient method of correction factor, easy to promote the use of a wide range. Due to the large number of leaves and poor rules of potato, there are no easy-to-read leaf area correction factors such as wheat and other crops, resulting in the determination of potato leaf area difficult and error in actual operation. In this paper, the correction coefficient of three different determination methods for potato leaf area was determined through the experimental study and the calculation of the measured value of the paper method. The correction coefficient K of the leaf area was 0.76 in long and wide plot method, which was simple and easy to popularize. The mechanical plotter leaf area measurement results for the actual area of 92%, the measured value multiplied by 1.09 to get a more realistic area, the instrument is cumbersome to use, inconvenient to use; SHY-150 type scanning area measuring instrument only real 71% of the area, the measured value multiplied by 1.40 to get the actual area, due to its high cost, coupled with higher requirements for the operation prone to human error and other reasons, affecting the widespread use.