Japanese Brome Response to Atrazine in Combination with Nitrogen Fertilizer in the Mixed Prairie

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Abstract
Atrazine was used to control Japanese brome in conjunction with N fertilization to determine if herbage production could be increased more than by fertilization alone. Atrazine treatments included a single application, application in alternate years and application for 2 or 3 consecutive years. Atrazine did not significantly increase production more than fertilizer alone and caused some decreases in western wheatgrass [Agropyron smithii] production at low rates of N in 1 yr at 1 location. Unless atrazine was applied in 2 or more years, Japanese brome was prevalent the 2nd growing season after application as where it had never been controlled. Application of atrazine in consecutive years increased shortgrass production at 1 location.

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