Utilizing Remote Sensing to Determine the Relationship Between
Sulfentrazone Herbicide and Soybean Injury
Contacts: Reid J. Smeda and William G. Johnson, Dept. of Agronomy
UMC
A field experiment was established to determine the relationship between sulfentrazone/chlorimuron herbicide injury to soybean and crop yield in a field situation. Using no-till, a sulfentrazone sensitive variety of soybean (Pioneer 94B01) was sown in 76 cm rows in mid-May. A premix of sulfentrazone/chlorimuron was applied broadcast at a labeled rate to all areas except two sites. These two sites contained strips treated with varying levels of the herbicide pre-mix, and were used to calibrate herbicide injury to soybean. Visible herbicide injury ranged from 0 to 50% at 5 weeks after planting, with the majority of plants exhibiting less than 10% injury. Visible plant stunting ranged from 0 to 50%, with 58% of the ratings in the 0 to 10% range, and 41% of the ratings in the 11 to 25% range. By 12 weeks after planting, no herbicide injury was evident on soybean, but 72% of sampled plants still exhibited 0-10% stunting. Plant stand and final plant height were also parameters measured to elucidate herbicide effects, and areas with reduced plant stand and plant height were associated with areas with more prominent plant injury or stunting. A yield map of the experimental site revealed average yield reductions of up to 40% in areas that corresponded to areas with the greatest amount of soybean plant damage.
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