The Physiological Response of TifEagle Bermudagrass to
Nitrogen and Trinexapac-ethyl. (C05-mccullough437590-oral)
Authors:
P.E. McCullough* - Clemson University H. Liu - Clemson University
L.B. McCarty - Clemson University T. Whitwell - Clemson University
Abstract:
The objective of this greenhouse experiment was to evaluate the interaction of four weekly nitrogen fertility rates with applications of trinexapac-ethyl (TE) every three weeks at 0.05 kg a.i. ha-1 to determine their influence on rooting, mineral nutrition, clipping yield, and chlorophyll concentration of TifEagle bermudagrass. Research was conducted in two studies at the Clemson University Greenhouse, Clemson, SC from September 2002 to May 2003. TifEagle plugs were placed in lysimeters built to USGA specification and received weekly nitrogen inputs at 6.11 (N1), 12.22 (N2), 18.33 (N3), and 24.44 (N4) kg N ha-1. Turf treated with N2, N3, and N4 rates with TE applications had significantly reduced clipping yield 3 weeks after initial treatment and remained significantly lower than those N rates without TE applications. Visual quality for turf treated with N2, N3, and N4 was enhanced by TE after 8 weeks in Study 1 and after 10 weeks in Study 2. Root mass decreased after 16 weeks as N rate increased for untreated turf in both studies. Turf treated with TE regardless of N rate had significantly improved root mass in Study 1. Only N1 treated turf with TE had improved root mass after 16 weeks in Study 2. Leaf nitrogen recovery for turf treated with TE regardless of N rate was reduced to levels comparable to turf treated with N1. Field studies are currently being conducted for this research.
Speaker Information: Patrick McCullough, Clemson University, 136 D P & A Building Department of Horticultu, Clemson, SC 29630; Phone: 864-650-3974; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 7:55 AM-11:15 AM Presentation Start: 8:00 AM
Keywords: Trinexapac-ethyl; TifEagle; Nitrogen; Bermudagrass
