The growth process of the leaf area index study and the causes of the measurement The leaf of the plant has a multi-faceted influence on the growth process of the plant, affecting the photosynthesis, transpiration, absorption of nutrients, etc., of which the leaf area and chlorophyll content in the plant are Affecting the rate of photosynthesis of plants directly, the plant leaf area index can be measured using a portable leaf area meter, while the chlorophyll content is operated by a chlorophyll meter, which is a leaf that absorbs nutrients out of the leaf. Important tool. The research on the leaf area index and the history of its development have also been in place for nearly 100 years. Let's take a brief look at its development process.
The earliest leaf area index was used as a crop science. When the crop physiology was introduced as a discipline by Balls in 1917, the main purpose was to define the dynamics of crop yield development, and after some progress was made through research. By the mid-1940s, when scientists studied the leaf area index, they were no longer confined solely to the relationship between leaf area index and yield. Instead, the leaf area index was used to understand the quantitative relationship between plant populations and communities. It is concluded that LAI is a dimensionless measure of leaf cover and is influenced by plant size, age, spacing, and other factors. In 1971, the leaf area index was determined quantitatively. The leaf area was the main reason for the difference in the amount of plant harvest. Later, LAI became an important parameter for the physiological and ecological research of crops and fruit trees and breeding of improved varieties and was widely used.
After decades of development, LAI has become an indispensable and important parameter for analyzing population and community growth in photosynthesis, transpiration, linking photosynthesis and transpiration, water use, and the basis for productivity. At the same time, there are researches and developments in many fields. It is precisely because of the importance attached to the leaf area index that the method of measuring the leaf area index is also comparatively numerous. There are spheric meters, paper, and grid calculations. , drainage method, empirical formula calculation method, tree analysis method, point contact method, leaf area detector, etc. Among these methods, in addition to the last one is a non-invasive measurement, the other will have a certain ability to damage, direct Affects plants.
ER308 S.S Welding Wire
The Stainless Steel Welding Wire ER308 is Weldability and fluidity are better than 304 Good crack and corrosion resistance due to moderate ferrite content.
general purpose wire for welding AISI321, 347, and equivalent grades, High silicon content for minimal spatter, and weld fluidity.
ER308 is Suitable for welding AISI 304 and 308H steel, good strength at high temperature due to higher carbon content.
Er308 S.S Welding Wire,Stainless Tig Wire,Stainless Steel Filler Wire,308 Stainless Steel Mig Wire
Jiangyin Vankey Machinery Technology Co.,Ltd , https://www.jswkweldingwire.com