Photosynthetically Active Radiation (PAR)
The spectral range of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis.
Также говорят: PAR, photosynthetically active photon flux, PAPF
PAR is the primary driver of plant growth and biomass accumulation. In agronomy, measuring PAR helps to evaluate how efficiently a crop canopy captures solar energy to maximize yield potential throughout the growing season.
Growers use PAR data to adjust planting densities and row spacings. By ensuring that the leaf area index is optimized, farmers can prevent light wastage where radiation hits the soil surface instead of being absorbed by leaves.
A common mistake is failing to account for canopy architecture, which can lead to self-shading within the crop. Providing adequate spacing ensures that lower leaves receive enough light to contribute to the overall carbon gain of the plant.