Polypropylene is a polymer formed by addition polymerization of propylene. It is a white waxy material with a transparent and light appearance. The chemical formula is (C3H6)n, the density is 0.89~0.91g/cm3, it is flammable, the melting point is 189℃, it softens at about 155℃, and the use temperature range is -30~140℃. It is resistant to corrosion by acids, alkalis, salt solutions and a variety of organic solvents below 80°C, and can be decomposed under high temperature and oxidation. Polypropylene is widely used in the production of clothing, blankets and other fiber products, medical equipment, automobiles, bicycles, parts, pipelines, chemical containers, etc. It is also used in food and pharmaceutical packaging. Polypropylene,PP Resin,PP Granules,PP Plastic Granules Yucheng Jinhe Industrial Co.,Ltd , https://www.hnchromiumoxidegreen.com
Over the years, people have done a lot of experimental research on the measurement of leaf area. There are many ways to determine leaf area, but there are certain disadvantages. Among them, the grid process is time-consuming and time-consuming, and the measurement accuracy of irregularly shaped blades is greatly reduced; and the perforation weighing method (or direct weighing method) is greatly affected by the blade thickness, leaf age, and leaf water content. Therefore, the error is too large. Scanners were used to collect the image of the leaves and the image processing software was used to determine the length, width, weight, leaf shape index, leaf area index, specific leaf area, and other indicators. Compared with the results of the living leaf area meter, the living leaf area meter was used to measure the leaf area. The feasibility of leaf area, and trying to find a simple, rapid and accurate method to calculate the leaf area, according to the specific leaf area cluster analysis, to provide services for the study of plant physiological ecology.
The experiment selected 30 pieces of leaves of Schefflera, Cyclamen, Bougainvillea, African Jasmine, Osmanthus fragrans and Sinus radix in complete sizes, and the leaves were serially numbered back to the laboratory. The length, width, fresh weight and dry weight of the leaf were measured. Leaf area was used to measure the leaf area of ​​the leaf. The scanner scanned the leaf to obtain the image of the leaf. The image processing technique was used to measure the leaf area. The specific leaf area and leaf area index were calculated. The leaf shape index was analyzed and compared between the living leaf area analyzer and the scanner. The reliability of the living leaf area meter in the application of ornamental plants was verified.
Take one leaf of the plant, clean the upper and lower leaves with a dry gauze, press the handle on the cover of the pressure detector, open the upper cover of the detector, and insert the leaf in the transverse direction to expose the leaf base or petiole. Release the handle and close the upper cover. Hold the detector handle in the right hand and push back the zero button so that the screen displays /00. The left hand gently pulls the leaf and measures the length of the wire until the leaf passes completely through the detector and the number displayed on the fluorescent screen is recorded, which is the area of ​​the leaf. Digital images of plant leaves were obtained using a scanner, and Photoshop software was used to analyze and calculate the leaf area. Open the leaf image and use the Photoshop software/Magnetic lasso 0 or / Magic wand 0 tool to select the leaf part of the image, then open the menu / image 0, select / histogram 0 option, record the / pixel 0 value in the display parameter, Using the software/Lasso 0 tool, select any known pattern area of ​​the coordinate paper, and record the selection/pixel 0 value as the calculation coefficient. The calculation formula is: leaf area = number of pixels in the blade/number of pixels in the selected grid. If the scanned image is scanned according to 100%, no reference is needed. You can directly check the size of the image (preferably in centimeters) and select the entire image to obtain the entire image pixel from the histogram. Leaf Area = Number of Pixels in the Leaf / Whole Image The number of pixels @ the entire picture area.
Although the leaf area measurement by a live leaf area meter is simple and quick, it is affected by the speed of hand-holding (should be kept at 1m#s-1), and it can be guaranteed to be as accurate as possible in case of skilled operation. This paper examined the feasibility of leaf area determination by living leaf area meter and determined the leaf area, specific leaf area, leaf shape index and leaf area index of six species of plants. Correlation analysis between leaf area and leaf width was obtained. The leaf width is closely related to the leaf area, and a simple method for measuring the leaf area is obtained. That is to say, the quadratic equation of the leaf area is related to the leaf width. The area of ​​the leaf can be calculated by measuring the width of the leaf. Finally, the area of ​​the leaf is calculated. The cluster analysis of ornamental plants showed that the specific leaf area can reflect the adaptability of ornamental plants to light. The demand for light of the six species of plants is: Cyclamen and Bougainvillea are sunny and osmanthus is sunny, but there are certain The shade-tolerant ability of Schima superba, African jasmine and green radish is half shade, which provides a reliable reference for the rational management of ornamental plants.
Determination of Leaf Area of ​​Ornamental Plants by Living Leaf Area Analyzer
The determination of leaf area plays an important role in plant health and plant protection. Because the leaf is the main organ of the plant, this organ serves many important tasks. If the leaf is unhealthy, it will inevitably affect the health of the plant. Rapid and accurate determination of leaf area is very important for crops to be closely planted, adjust population results, and apply variable and precise sprinkler irrigation. It has important reference value for accurate estimation of pests and diseases and reasonable protection measures.