With the development of agricultural instruments, the number of instrumental products used in plant physiology research has also been increasing. Take the leaf surface humidity sensor as an example, the instrument can be used to test the humidity of the leaf surface of plants with high accuracy, and thus help agricultural workers to study The growth and development of crops and the prevention and control of pests and diseases. The monitoring of these environmental factors that are closely related to the growth of plants through the use of foliar humidity sensors can help develop agricultural and agricultural operations, formulate reasonable agronomic improvement measures, and increase the degree of refinement and production efficiency of agricultural production.
However, when it comes to the role of leaf surface humidity sensors in agriculture, the most important thing is pest and disease control. In terms of plant diseases, plant diseases are often silent, and when they are discovered, the extent of plant diseases has become It is quite high, so it will greatly reduce the difficulty of control and prevention and control. Among them, humidity is an important environmental factor that causes plant diseases. In general, at 25°C, 1 h of condensation on the foliage is enough to cause the bacteria to infect. The onset of the leaves shows that the high temperature and humidity environment is an important cause of plant diseases, and because these environmental impacts on the plants directly affect the plant leaves, the use of leaf surface humidity sensors to determine the leaf surface humidity can More accurate and real response to the humidity in the field.
Of course, this does not mean that the lower the humidity, the better. In fact, many wet plants also have requirements for humidity. For example, tropical orchids and many foliage plants, such plants require air humidity of at least 60%. Under normal circumstances, as long as not less than 40%, most varieties can grow normally. If the humidity is less than 40%, the leaves of the plant will produce a blurring and yellowing phenomenon. Therefore, maintaining the proper humidity range in the field is beneficial to the normal development and growth of plants, and the control of the humidity, of course, is the simplest and most effective with the leaf surface humidity sensor. Therefore, the use of good leaf surface humidity sensors, through the precise regulation of the microclimate, can actually become an effective means of plant disease control. At the same time, through long-term monitoring of plant leaf humidity data, it will help to deal with the impact of weather changes on plant physiology, and improve the control of pests and diseases. Effect.
Characteristics of modern-day folding tables and chairs originated in medieval times, a period from the fall of
the last Roman Emperor, in 476 AD, to the fall of Constantinople, in 1453.
Furniture makers deliberately built tables and chairs that could easily be disassembled and transported. So
when harsh fighting erupted between nations, lords, and neighbors, families could grab their belongings
and flee at a moment's notice. Most of the tables of this era collapsed rather than unfolded.
Bed and Board
Interestingly, the expression "bed and board " was coined in the Medieval era with the latter "board"
referring to the main table used for dining. The "board" was just that - a portable trestle table that could
easily be packed away when not in use and transported with ease. Folding chairs were popular amongst
the medieval aristocracy since again they could be easily folded and carried when on the move. Styles
were simple and practical. They were usually made of oak or other woods.
Folding tables have evolved through the centuries with the emergence of new technologies and designs.
Today's tabletop options range from wood, particle board, and melamine, laminates, aluminum, plastic,
and so forth. Table legs can be built with steel, aluminum, other metals, and plastic. So while the main
use of folding tables has changed throughout history, the purpose remains the same - collapsible,
easily storable, portable, and lightweight.
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