Comparison of various methods for determination of wood pineapple leaf area
The wood pineapple is a genus evergreen tree with long, elliptical or obovate leaves, leathery, shiny, fruity composite fruit, ovate-elliptic, angular skin, often born on the trunk, and fruity. Strong tree vigor, suitable for street trees, landscape trees. Leaf is the most important place for photosynthesis of plants, and leaf area measurement is the most basic work. As for the determination of leaf area, many plants have been studied, such as vegetables such as radish, sweet peppers, tomatoes, beets, fruit trees such as apple pears, grapes, persimmons, alfalfa, flowers such as camellia, sunflowers, and other crops. There are few reports on leaf area determination of jackfruit, but this paper mainly analyzes the advantages and disadvantages of several methods for determining the leaf area of ​​wood pineapple.
As the main organs of photosynthesis and transpiration, leaf development and area have a great influence on the growth and development of fruit trees, fruit quality and yield, so it has become an important indicator in the study of physiological and biochemical, genetic breeding, cultivation and other research. At present, there are many common leaf area determination methods, which can be roughly divided into traditional manual measurement methods and advanced electronic technology measurement methods. The traditional manual methods include square paper method, copy weighing method, punching weighing method, coefficient method, etc. The common feature is that the operation is simple, the required equipment and equipment are simple and cheap, but time-consuming, labor-consuming, sampling inconvenience, and repetition Sampling will destroy the plant body. In addition to the accuracy and accuracy of the grid paper method and the copy weighing method, other methods are generally low, especially the error of the punching and weighing method. The electronic processing technologies include living leaf area metering, portable leaf area metering, and digital image processing technology (ie, Photoshop). The features of the electronic processing technology include accurate measurement and good repeatability, but the operation is relatively complicated and the equipment is expensive.
Compared with the weighing method, Photoshop method has the advantages of rapidity, simplicity and accuracy. The calculation process is executed by the computer, and it is fast. It can avoid errors caused by human operations, reduce labor intensity and save time. Photoshop uses pixels to express leaf area. The results obtained are not affected by the shape, size, thickness, etc. of the blade. The effect can therefore be used to determine the leaf area of ​​most species of plants; the scanned original image can be stored, carried, and readily accessible for research anywhere. Thus, this method is suitable for the study of a large number of leaf area measurements. The most convenient method is the leaf area analyzer method. Although the leaf area meter is more cost-effective than other methods, the leaf area meter has a certain period of use if it is considered in the long run, it can be used many times after purchase, and the leaf area meter can display in a few seconds. As a result, its advantages such as high accuracy and ease of use are all superior to other methods. With the popularization of scientific instruments, the leaf area meter has a more show stage.
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