Abstract
Many studies have reported adverse effects of increased ultraviolet-B (UV-B, 280-320nm) on crop growth and yield. Most of the studies, however, have been conducted in chambers or greenhouses, where plants are more sensitive to UV-B than in the field. In this study, we conducted enhanced UV-B irradiation to rice (Oryza sativa L.) plants in a paddy for 3 years 1993-1995. The UV-B enhancement was up to 1.7 times ambient UV-BBE (biologically effective UV-B) or 6.76kJ m-2 d-1 for seasonal mean daily integral UV-BBE. The UV-B irradiation caused a slight decrease in chlorophyll content and a slight increase in the UV-absorbing compounds. The UV-B irradiation caused no significant changes in rice growth traits, e.g. plant height and biomass, but reduced the yield by up to 7%, which can be translated into a 1% yield loss by a 10% UV-BBE increase. Rice yield loss will therefore be less than 2% with the projected UV-BBE increase of 15%, caused by a peak ozone depletion of ca. 7% for the summer-autumn season in the northern midlatitudes.
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