Effects of Turf Cultivation Practices on the Efficacy of Preemergence Grass Herbicides
1986
Branham, B. E. | Rieke, P. E.
A 2-yr field study was conducted to determine the effects of cultivation operations on the efficacy of three preemergence herbicides used in turf. Cultivation is an important cultural practice used to relieve soil compaction and improve turf rooting, but it is often avoided in the spring for fear of disrupting the preemergence herbicide and reducing annual grass control. Benefin (N-butyl, N-ethyl-α, α,α-trifluoro-2,6-dinitro-p-toluidine) at 2.2 kg ha⁻¹, bensulide [S-(O,O-di-isopropyl phosphorodithioate) ester of N-(2-mercaptoethyl) benzenesulfonamide] at 11.2 kg ha⁻¹, and DCPA (dimethyl tetrachloroterephthalate) at 11.8 kg ha⁻¹ were applied to an annual bluegrass [Poa annua var. reptans (Hauskins)] turf growing on an Owosso-Marlette sandy loam complex (fine-loamy, mixed, mesic Typic Glossobic-Hapludalfs). Four cultivation treatments consisting of core cultivation one pass or three passes, vertical mowing, and a control were applied at the time of herbicide application or 4 weeks after herbicide application. Crabgrass [Digitaria sangiunalis (L.) Scop.] populations were evaluated throughout the summer to determine the effects of the herbicide and cultivation treatments. Neither cultivation nor time of cultivation had a significant effect on the degree of crabgrass control afforded by the herbicides. The only significant difference in the study occurred when comparing the herbicide-treated plots to an untreated control. Data indicate that cultivation operations can be safely performed in the spring without disrupting the preemergence herbicide barrier.
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