Rapid Determination Method for Leaf Area of Potato

Using paper-weighing method to measure actual leaves area of potato, meanwhile record the length and width of each measured leaf to get approximate leaf area. Using measured area and approximate area to get correction coefficient k (0.726 4). Than, using leaf length (x1), leaf width (x2), leaf length × leaf width as main parameters, the regression equation (y = ax + b) with the leaf area (y) was established. The correlation coefficient between leaf length and leaf area and leaf width and leaf area were 0.915 2 and 0.946 4, respectively; the multiple correlation coefficient between leaf length and leaf area and leaf width and leaf area all were 0.986 8, and reached significant level under 0.01 level. Three regression equations can be used to measure the potato leaf area, in which the regression equation of leaf length × leaf width and leaf area had more precise calculated results.