At present, leaf area measurement methods commonly used are grid cross method, leaf area instrument method, copy weighing method, dry weight method, digital image processing method and the like. Brazil has a large area of ​​banana leaves. Under the condition of sufficient water and fertilizer, the leaf length can reach 3m and the leaf width can reach 1m. When it is planted in the field for about 4 months, the leaf length can reach 1m or so, and the width is more than 0.4m. It is no longer possible to use the United States. CID's handheld leaf area meter was used to measure the leaf area. As the plant grew, the leaves grew larger and larger. The grid cross method and the copy quality method were stable, but they required a lot of work and required a lot of consumption. The time; the copy weighing rule requires a destructive sampling assay.
The statistical test results of actual and simulated values ​​of banana leaf area in Brazil showed that the average absolute error, standard error of error, and correlation between simulated and measured leaf area obtained from the product of Brazilian banana leaf length, leaf width and length-breadth bread during vegetative growth period The coefficients reached a very significant level, and the average absolute error, standard error of error, and correlation coefficient between simulated and measured values ​​of leaf area obtained from the banana leaf length and breadth and length of Brazilian bananas during the buds and budding stages reached extremely significant levels. It shows that the simulated value is in good agreement with the measured value. In the vegetative growth period, the leaf-area correlation coefficient of the long-width product simulation is the highest, the leaf area meter leaf length simulation is the second, and the long-width product simulation has the smallest standard error of the leaf area difference, and the leaf length is the second; at the bud stage and In the budding period, the leaf area simulated by the leaf length had the highest correlation coefficient, and the long-width product simulation was the second.
The leaf area meter's measurement of banana leaves in Brazil found that its leaf area has a certain proportion to the leaf length, leaf width and length-width product. The leaf area meter is also called leaf area meter and can be applied to field work. Without any damage to the blades, the measurement accuracy is high and the speed is fast. Compared with the previous method, the work efficiency is greatly improved.
Leaf is the place where plants perform transpiration, and it is also an important organ of plants. The size of leaf area is directly related to the intensity of photosynthesis and transpiration. Therefore, leaf area directly relates to the growth and development of plants, and leaf area meter is used to measure leaf. The size of the area.