Abstract
Most of the studies reported on the effects of UV-B on plants were conducted using supplemental UV-B coming from UV-emitting lamps. The output of UV-B irrandance from the lamps, however, could be affected by different factors, a critical consideration in the study of UV-B effects on crops. An experiment was conducted at the IRRI field to determine UV-B irradiance at different voltages (160–220V), solar irradiance, and film photo-oxidation. Supplemental UV-B was provided by pre-aged (100h) UV-emitting fluorescent lamps that were enclosed by filters of either cellulose acetate (UV-B treatment) or mylar polyester (control treatment). UV-B irradiance was measured using an Optronic 752 Spectroradiometer.
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