Yield reduction was the mainly attributable to change of pod number per plant under UV-B radiation in the 2-year study. UV-B radiation decreased average pod number of per plant of three soy-bean cultivars by 34.5%. This suggests that UV-B radiation imposed during early flowering stage would change assimilates availability to the developing reproductive structures, influence flowering, and flower and pod abscission number with a resultant change in final pod number at harvest. Pod number per plant was the yield component most influenced by change in cultural and environmental conditions (Mathew et al., 2000).