The number of cotton bolls on plants exposed to O3 was reduced.
Similarly, Oshima et al. (1979) reported that exposure to ozone
decreased boll production in cotton. Fernandez-Bayon et al. (1993)
reported that yield of muskmelon (Cucumis melo L.) and water
melon (Citrulus lanatus (thunb. Matsum & Nakai)) was reduced
by enhanced ozone concentration. However, Retzlaff and Williams
(1997) observed that the numbers of fruits per tree of plum (Prunus
salicina Lindl.) decreased as ozone concentration increased.