The leaf is the most important organ for photosynthesis and transpiration of plants. The leaf area size is directly related to the synthesis of photosynthetic organisms and the efficiency of transpiration. The leaf area detector is a professional instrument for measuring the size of the leaf area. The determination of leaf area is of great significance for studying the biological characteristics of pumpkins and guiding production. Over the years, a great deal of research has been conducted on the determination of plant leaf area, but various methods have more or less certain disadvantages. The traditional leaf area measurement method (checkerboard method) is both laborious and cumbersome. It is more difficult to measure large and irregular leaves of pumpkins; the method of punching (fresh and dry) is more complicated and the leaves are also destroyed. The results are inaccurate and should not be used in actual measurements due to the influence of the size, thickness, leaf age, hole pattern, and water content of the leaves. Using the regression equation method to calculate the area of ​​the leaves, the equation can be used to create the same type of leaf. The estimation is simple and the operation is relatively simple. At present, regression equations have been established for parameters such as leaf area and leaf length, width, lateral vein, midrib, and even petiole, but this method requires a large number of leaves to be measured in advance to establish a regression equation, and the error is larger for a single leaf. There is also a leaf area scanner assay, which has no requirement on the area of ​​the leaf, can measure the area no matter how large, and does not require the color, thickness, moisture content, etc. of the leaf, but it must be measured Remove the leaves and perform the measurement again. This will cause unnecessary damage to the plant. The leaf area detector described in this paper can be directly measured on the blade to achieve a nondestructive measurement.
The leaf area measuring instrument mainly has two models: YMJ-C leaf area meter and YMJ-A leaf area detector. Among them, the YMJ-A leaf area detector is the instrument for non-destructive determination of leaf area mentioned above. So here we look at some of the simple introduction of this instrument, I hope everyone has a concept.
YMJ-A portable leaf area measuring instrument: The blades are clamped into the measuring instrument, the blades are placed under the pressure bar, the initial position cannot block the measuring window; then the blades are slowly pulled out, and finally the measuring result is displayed by pressing the “V†key. YMJ-A Portable Leaf Area Meter The biggest advantage of this instrument is that it is easy to carry and can be carried to the field. The YMJ-A portable leaf area meter uses stretching blades to measure. Therefore, the tensile speed and direction are all required to be higher, so the accuracy of the YMJ-A portable leaf area meter is not very high.
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