In recent years, with the rapid development of facility agriculture, more and more research on plant illumination products has been made, and LED light source has been widely used in the field of plant illumination because of its low power consumption, small size, and ability to illuminate plants at close range. . Since plant growth has certain requirements on the optical parameters of the light environment, and different plants absorb light differently, it is necessary to adopt corresponding illumination products for the growth needs of specific plants, and to realize plants by using advanced measurement techniques and instruments. Detection of the lighting environment.
Plant growth & light environment
Judging whether the illumination conditions provided by plant growth are of high quality, we must start from the following four aspects: light quality, optical density, light uniformity, and length.
Light quality
Light quality, ie spectral quality. Different spectral components of light fixtures have different effects on plant growth, such as red light can promote the growth of plant stems; blue violet light contributes to the formation of fruit; therefore, according to the growth requirements of plants, the light quality of suitable light quality is selected.
Optical density
Is the plant's illumination as good as possible? The answer is of course no. It is well known that plants have the distinction between hi-light plants and shade plants, mainly due to the different light saturation points of plants. When the light intensity reaches the light saturation point, the photosynthesis of the plant reaches its peak; if the light intensity continues to increase at this time, the photosynthesis begins to decline, and the photoinhibition phenomenon damages the plant. The optical density of plant illumination is characterized by the photon flux density ppfd in umol.s-1.m-2.
Light uniformity
Led light source has strong directionality. Therefore, in order to ensure better plant morphology, it is very important to design light uniformity for plant growth environment; it mainly includes light source color consistency design and spatial radiation consistency design.
Long
Like humans, plant growth also has its biological rhythm. The photosynthesis of plants actually includes two types of photoreaction and dark reaction; in which the dark reaction does not require illumination conditions, therefore, it is not possible to provide excessive light conditions at night, otherwise the plants cannot rest at night and affect the dark reaction.
Choice of lighting products
The choice of lighting products should be based on the needs of plant growth. Studies have found that plants absorb wavelengths with wavelength selectivity. The most commonly used plant photosynthetic curve is the rqe curve proposed by Mccree in 1972.
　
Plant illumination detection program
Based on the strong dependence of plant growth on light conditions, it is very important to realize on-site monitoring and measurement of plant growth and illumination conditions. The remote pla-20 plant light analyzer is a professional measuring device designed for accurate measurement and analysis of plant light. It adopts a number of patented mobile spectrum measurement techniques to ensure millisecond measurement while ensuring high precision. The ultra-wide measurement range of 350-800nm ​​can meet the needs of different plant measurement applications; the device is designed to be easily and conveniently applied to various measurements of various plant illuminations, such as illumination analysis, monitoring, research and communication. Wait.
Functional advantage
â— The device integrates powerful data processing functions, combined with the measurement, analysis and comparison of various plant illumination parameters in the radiance system, photometric system, plant photometric system, and optical quantum system. The measurement parameters include: photon flux density ppfd, photosynthetic irradiance ep, chlorophyll a/b weighted irradiance, blue-violet irradiance, red-orange radiation (shooting) illuminance, and the like.
◠350-800nm ​​ultra-wide plant illumination band measurement, can analyze the light quantity value of any band to meet different application requirements; research shows that in the growth process of plants, about 350nm ultraviolet light and 800nm ​​infrared radiation on plant morphology The occurrence of the important role, and the ordinary 380-780nm visible light detector can not meet the needs of plant illumination testing, therefore, the instrument uses the 350-800nm ​​ultra-wide band as the plant illumination detection range to meet the needs of larger applications.
Absorption curves of different pigments during plant growth
â— Adopting the patented technology of stray light correction to improve the measurement accuracy of the handheld spectrum color irradiance meter;
â— Equipped with a 4.2-inch display, you can easily view a variety of plant parameter measurement results; data can also be exported in excel, jpg or other formats for easy viewing and editing;
â— The probe can be detached and communicated remotely via Bluetooth or wireless connection. At the same time, the PC software can be used to implement richer analysis functions, such as analyzing the time constant of illumination, analyzing the fill light requirement, and analyzing the on-site transmittance of the greenhouse.
Light versus time curve
In short, the emergence of pla-20 provides great convenience for the intelligent detection of plant illumination. It can be widely used in plant light field measurement in plant factories, vegetable greenhouses, flower cultivation, etc., and thus provides better lighting conditions for plant growth. Promote the development of modern agriculture.
Editor: Yingzi
TL Series Push Wire Connectors
Tl Series Push Wire Connectors,Led Connector System,Parallel Terminal Blocks,Low Voltage Wire Connectors
Jiangmen Krealux Electrical Appliances Co.,Ltd. , https://www.krealux-online.com