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The test variety is open, five-year-old tree, moderate tree vigor. Because of the different shape and size of the leaves of the branches of the hawthorn _7 different nodes, the leaves in the middle of the branches are the same and stable. Therefore, 6 trees are selected, and the leaves with 14-18 knots are selected at random in each azimuth on each tree. Six, first determine their length, width, and then use the leaf area meter to measure their actual area.
The measurement data of the leaf area meter combined with the length and width of the mountain plant leaves have a certain correlation with their actual area. Assuming that S is actually a KxLXH (K is the correction coefficient), the calculation result of 36 blades: the average value of K is 0.58, and the standard deviation is 0.03, which is S actual one. .58LXH. Measuring the length and width of a mountain planting tree leaf in the field, and then using the formula S=0.58xLxH to ​​calculate the leaf area size is a simple measurement method that does not damage the structure of the hillside tree.
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One of the important factors influencing the photosynthetic yield of fruit trees is the leaf area. In the growth stage of fruit trees, the change of leaf area is also the main basis for formulating cultivation techniques, and it is also a common indicator for production research. The leaf area meter is mainly applied to apple, pear and citrus in the determination of fruit and leaf area. However, because the shape of the fruit trees is a thousand postures, the differences among tree species are quite obvious. The measurement of the leaf area of ​​the hawthorn by the leaf area meter needs to be advanced in exploration.