The measurement of leaf area has become an indispensable part of agricultural production. The size of leaf area index has a great influence on plant growth and development and even the final product quality. A good method for measuring leaf area should be simple, convenient, and low cost, and each measurement value is highly close to the actual area of ​​the blade to be tested, that is, the error is small and the repeatability is good. At present, the leaf area measurement methods mainly include leaf area meter method, grid method, punching weighing method, paper cutting weighing method, image pixel method, correlation coefficient measurement method and regression equation method. 1. The grid method is labor-intensive and time-consuming, and the error is large when the edge of the blade is complicated; 2. The perforation measurement method has a certain degree of damage to the plant leaves, and it is difficult to perforate the small leaves and the leaves with coarse veins, and the application range is small in practice; 3. The correlation coefficient measurement method and the regression equation method need to perform area measurement after complicated mathematical modeling, and the accuracy is relatively low, and can only be measured for a certain kind of plant, and cannot be common between varieties and types. It is rarely used in practice. 4, paper-cut weighing method is simple and convenient to operate, and does not require special instruments; 5. Image pixels have the advantages of simple and rapid measurement, batch measurement, etc. The measurement is not affected by factors such as blade size and thickness; 6. The leaf area meter measurement method is carried out by using the living body area area measuring instrument, and has the advantages of high precision, small error, simple and convenient, can realize non-destructive measurement of the blade, and does not damage the blade, and has been widely used now. Antipyretic & Analgesic,Paracetamol Injection,Injection For Antipyretic,Injection For Analgesic Shandong Qidu Pharmaceutical Co., Ltd. , https://www.qdyypharma.com