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The herbicide imazaquin is used for purple nutsedge control on certain turfgrasses. Common bermudagrass exhibits stunting and slight discoloration effects after applications at the label rate. A field experiment was conducted to evaluate the effects of either N, Fe, or Mn applied either 2 days before or after applications of the imazaquin. Three applications were made 8-10 days apart in 1988. Initially, amendments applied prior to the herbicide reduced the discoloration. Fe was as effective as N in preventing discoloration, but not in correcting discoloration (after herbicide application). After the second and third applications, Fe was superior to N when used in the “preventative” mode. Mn showed no real effects. Two weeks after the third applications were made, the plots which received either none (checks) or any of the three amendments without the herbicide had better color than those which received the herbicide with or without the amendments. Iron chlorosis-type symptoms were a function of the amendment type-used, as N-enhanced chlorosis occurred on N checks and on herbicide plots receiving N, regardless of application order.

RESPONSE OF COMMON BERMUDAGRASS TURF TO FERTILIZER AMENDMENTS AND IMAZAQUIN HERBICIDE