Abstract
AbstractSubsurface sweep applicators were designed and constructed using commercially available sweeps (25.4 cm wide) and spray nozzles. Performance was satisfactory, both in a replicated Upland cotton (Gossypium hirsutum L.) test and in a general field planting. Purple nutsedge (Cyperus rotundus L.) control was excellent, and there was a slight but nonsignificant increase in cotton yield. Precision placement of EPTC (S‐ethyl dipropylthiocarbamate) in both the horizontal and vertical planes was obtained with minimum disturbance to the profile of the finished seed‐bed. The device placed a 25.4‐cm‐wide band 5.1 cm under the soil surface. However, the same construction method could be used to make sweeps for other widths and depths of placement. Proper arrangement of the sweeps on a tool bar or cultivator can provide either band or broadcast coverage.
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