Non-invasive method for measuring changes in leaf area parameters

October 19, 2023

Changes in parameters of leaf area measured by non-in vitro method The main functions of the leaf were photosynthesis, transpiration, respiration, and absorption. About 90% of dry matter in plants is synthesized through leaves. The measurement of the content of chlorophyll in leaves is an important indicator for the detection of some disease resistance of plants. By measuring the leaf area and chlorophyll content in plants, we can instruct us to conduct reasonable fertilization, and prevent disease and insect pests. Harmful, etc. have some help. The measurement methods of the two can be divided into in vitro measurement methods and non-in vitro measurement methods. There are square paper method and weighing method to measure the leaf area in vitro, and the chlorophyll is isolated. The main method of measurement is the extraction method, and the non-in vitro measurement method is mainly performed by the instrument measurement method, such as the portable leaf area meter to measure the leaf area, and the chlorophyll meter to measure the chlorophyll content, using the instrument method to Measuring the two physiological structures of plant leaves, its advantages are mainly reflected in: rapid, accurate and so on. At the same time, there is a regression equation method for non-discrete measurement methods. Let's take a look at these two methods.
Leaf area detectors are used to measure the leaf area, although the accuracy is high and the operation is simple and fast, but the measuring instrument has limitations on the measured leaf area. Therefore, for those plants whose leaf area is large and where the leaves are not flat, the folds overlapped after the flattening is not convenient to measure using this method. Chlorophyll content was measured using a chlorophyll meter. The result of the measurement was more accurate, but he also had some drawbacks. The chlorophyll meter had certain limitations on the area and thickness of the measured leaf, and its measurement result was SPAD values, although there is a positive relationship between SPAD values ​​and chlorophyll content, but if you want to know the chlorophyll content exactly, you must convert the formula.
Instead, regression equations are used to measure variables, such as leaf area, to first understand the relationship between leaf length and leaf area, and to use this relationship to calculate leaf area. The method can quickly and accurately measure the leaf area content.

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