For the determination of broadleaf leaf area, there are currently four main methods:
First, based on digital camera and Auto CAD software measurement method
The digital image of the blade was obtained using a digital camera, and the leaf area of ​​the garden plant was calculated using Auto CAD software. And compared with the commonly used grid method, paper-cut method and leaf area meter measurement method. The results show that the method is particularly suitable for the determination of leafy, lobular garden plants and turfgrass leaf area.
Second, the number of lattice method
Draw it along the shape of the leaf and draw it on a transparent coordinate sheet. Then count the grid. When calculating the grid, the blade edge is calculated to be 1 if it exceeds half a grid, and less than half grid is not counted. Generally, when drawing coordinate paper, each grid has a length and a width of 1 cm, so the area is 1 cm 2 . Therefore, the number of counts is the number of areas of the blade (unit is cm 2 ).
Third, the drawing paper weighing method
This measurement method is somewhat similar to the number grid method, ie the previous steps are basically the same. Draw the leaves on a uniform transparent paper and then cut the paper. Since the uniform paper weight per unit area is the same, the cut paper can be converted into an area after being weighed. Specific conversion: Cut the painted paper leaves, weigh them on the balance and record them as W1; cut three 10cm 2 pieces of paper on the same paper, weigh them and find the average weight, which is recorded as W2. Then the measured blade area x can be calculated according to the following formula. X(cm 2 )= W1/W2*100
Fourth, the leaf area method
The plant leaf area meter is an instrument that is used by the user to determine the leaf area. The leaf area and related parameters of the blade can be measured accurately, quickly and without damage, and the area of ​​the picked plant leaves and other sheet-like objects can also be measured. Leaf area, average leaf area, leaf length, leaf width, aspect ratio can be measured. Because the measurement is accurate and convenient, the leaf area detector is widely used.
Further, the method for measuring the leaf area includes a photoelectric measurement method, a paper cutting method, a punching measurement method, a displacement measurement method, and a coefficient measurement method.
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