Photosythetically active radiation (400-700 nm), no weighting applied.
PAR(std = "Plant")
a character string "Plant" or "McCree"
a waveband object wavelength defining a wavelength range.
McCree, K. J. (1972) The action spectrum, absorptance and quantum yield of photosynthesis in crop plants. Agricultural Meteorology, 9, 191-216
waveband
# NOT RUN { PAR() PAR("Plant") # }
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