How to accurately measure photosynthetically active radiation

Photosynthetically active radiation is a certain band of radiant energy that can be absorbed and transformed by the chloroplast pigments of green plants and used to synthesize organic substances in the solar radiation spectrum. When the green plants perform photosynthesis, only light having a wavelength of 400-700 nm is absorbed, and other light is hardly absorbed. Therefore, photosynthetically active radiation is directly related to the photosynthesis process of the crop and the final crop yield. Photosynthesis of plants is the process by which plant leaves absorb light energy and convert light energy. Photosynthetically active radiation absorption ratio (FPAR) is an important detection index of vegetation water, energy and carbon cycle balance. Measurement and monitoring of photosynthetically active radiation in the environment can be Photosynthetically active radiometers were used for measurements. The photosynthetic active radiometers were first measured abroad and studied. How did it develop? Light and effective radiation are related to those physiological structures of plants?
In the 1980s and 1990s, foreign countries have conducted extensive research on photosynthetically active radiation (PAR), and domestic research in this field started late. Although the domestic start is relatively late, its development process is relatively rapid. So far, the measurement instrument for photosynthetically active radiation has been diversified. The photosynthetic active radiation recorder is a single measure of the light intensity, and the temperature illuminance monitor It is a multi-parameter measurement.
The photosynthetic effective radiometer is also referred to simply as an optical quantum meter. The characteristic is that the spectral response of the probe simulates the photosynthetic effective function, and the instrument is digitally displayed. It is compact and portable, and has good accuracy and stability. Quantum photometers are mainly used in agricultural and forestry research and production departments to measure photosynthetically active radiation. When using a photosynthetically active radiometer to measure, it is vulnerable to conditions such as soil background, solar elevation angle, leaf and canopy size, vegetation type and coverage, and the degree of influence under different background conditions is different. Photosynthetically active radiation is absorbed or reflected by the vegetation canopy, so leaf area has a direct effect on photosynthetically active radiation absorption (FPAR).
The photosynthetic active radiometer has a measuring range of 1-2,700 μmol m-2 s-1 (400-700 nm). The repeatability is controlled by temperature and humidity. The temperature is 20°C-25°C and the humidity is 20%-80%. ±5%. Photosynthetically active radiometers and rain recorders, like rain recorders, have powerful data storage capabilities and can store up to 30,000 data. At the same time can be viewed on the host page key. In addition, the GLZ-C type photosynthetic active radiometer can simultaneously record the photosynthetically active radiation (unit: μmol) light intensity (unit: LUX) two parameters, very intelligent.

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