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Spectral irradiance (300 - 1100 nm) in the midday hours on a sunny day in summer, measured in the horizontal plane above a greenhouse tomato crop, attains a maximum value of about 1.1 W m⁻² nm⁻¹ (5 µmol m⁻² s⁻¹ nm⁻¹). The irradiance at that time is equal to 494 W m⁻² (2730 µmol m⁻² s⁻¹). It is about 30 % lower than that outside the greenhouse. The photosynthetically active radiation (400 - 700 nm,...
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