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The effect of soil-injected ethylene on. the yield components of sugarbeets (Beta vulgaris L.) was investigated over a two-year period in experiments conducted in produc tion fields and at The University of Arizona, Ethylene was soil injected at 6,2' kg/ha at a depth of 20 cm in three fields of sugarbeets in 1974 and in four fields in 1975, Beets were harvested from rows 1, 5, 10, ■and 50 (76 cm'between row spacing) from the place of application, A general decline in sugar yield with distance from application was noted, but there were no significant differences in any of the yield parameters measured due to high variability. Ethylene was soil injected and Ethrel was applied to the soil surface as preemergence treatments in a potted experiment, Ethrel was fatal to sugarbeet seedlings, and there were no significant differences among the ethylene treatments in total per cent or speed of emergence. Ethylene was soil injected during the fifth week after planting, but there were.no significant differences among seedling fresh or dry weight as a result of these treatments. Results indicate that soil injection of ethylene can not be recommended at this time as a method for increasing sugar yield of beets in Arizona„ vii

Effect of Soil-Injected Ethylene on Sugarbeet (Beta vulgaris L.) Yield Parameters