Comparison of Two Different Methods in Determination of Grapevine Leaf Area

Abstract

Leaves are the basic organs that control many vital mechanisms such as photosynthesis, transpiration and respiration in plants; the species or variety is determined based on them in scientific studies; and the response of the plant to various stress conditions is measured on them. The determination of the surface area of leaves also sheds light on many studies. The present study aimed to compare two different methods for determining leaf area. With the first method used, the leaf area was determined from the pixel-area calculation using pixel values using the image processing program Photoshop CS6. The other method has been tried to determine the leaf area by using the weight-area relation. It was determined that the area found between the two methods varied between-12.93 cm 2 to 9.2 cm 2 on the leaves of 28 different grapevine varieties. By comparing these two methods, leaf area coefficient was determined for each variety. The regression coefficient was found as R 2 = 0.908 (p <0.01) between the area scanned on the computer and then determined by the Adobe Photoshop 6.0 program and the area by the weighted relational method. This statistically significant relationship between the two methods shows that the determination of leaf areas by using the weight-area relationship can be used in the condition where it is not possible to determine it by computer. © 2018, Centenary University. All rights reserved.