IMPROVING QUALITY OF BERMUDAGRASS POST-DORMANCY TRANSITION USING PARTIAL CONTROL TECHNIQUES

摘要

evaluate several methods of partially controlling perennial ryegrass in bermudagrass post-dormancy.Experimental design was a randomized complete block with a 4 x 3 factorial treatment arrangement.Partial control applications were made one of three ways: blot,drip,or strip.Herbicide treatments evaluated included foramsulfuron applied once to 30% of the plot or twice to either 20% or 30% of the plot at 29 g ai ha-1 and trifloxysulfuron-sodium applied once to 30% of the plot at 23 g ai ha-1.A broadcast application of foramsulfuron was made in early July at 29 g ai ha-1 to remove remaining perennial ryegrass.In 2006 and 2007,drip and blot applications maintained higher turfgrass quality throughout the transition period,whereas strip applications reduced overall quality.Partial application techniques also impacted bermudagrass cover.All partial control treatments increased bermudagrass cover from 19 to over 30% at 20 days after partial control treatment (DAPT) at all locations.At 114 DAPT,cover was up to 15% higher in treated plots versus nontreated plots.Results indicate that partial control techniques can be a valuable tool when transitioning from overseeded perennial ryegrass to bermudagrass postdormancy.