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.
Oxygen Plant is one kind of oxygen generation system producing oxygen. There are several types, one is small Oxygen Concentrator, producing small flow rate oxygen up to 20 liter per minute, it is mainly used at home. Another type is bigger flow rate oxygen plant, also using pressure swing adsorption technology. With this technology, oxygen with flow rate up to 200 Nm3/hr is suitable. For oxygen production flow rate from 200 to 3000 Nm3/hr, more suitable solution is using vacuum pressure swing adsorption technology. Its operation cost is more lower than PSA for this big flow rate oxygen production. For oxyen production bigger than 3000 Nm3/hr, normally use cryogenic technology. With this technology, oxygen production capacity can be 100000 Nm3/hr.
Cylinder Filling Oxygen Plant,Psa Oxygen Plant,Medical Oxygen Plant,Hospital Oxygen Plant,Gaseous Oxygen Plant
Shandong Gamma Gas Engineering Co. Ltd. , https://www.gammagases.com