Thursday, November 8, 2007 - 8:30 AM

Rooting in a Creeping Bentgrass Putting Green in Response to Summer Irrigation in 2006.

Jinmin Fu and Peter Dernoeden. Dept. Plant Science & LA, University of Maryland, College Park, MD 20742

Frequent versus infrequent irrigation are two common irrigation practices for most golf course managers in the mid-Atlantic region during summer months. The objectives of this 2006 field study were to examine how quality and rooting respond to light and frequent (LF) versus deep and infrequent (DI) irrigation in ‘Providence’ creeping bentgrass (Agrosis stolonifera L) putting green turf. Root measurements were obtained using the minirhizotron imaging technique. Turf quality was significantly lower and unacceptable during most rating dates for DI-irrigated bentgrass, when compared to LF-irrigated bentgrass. Deeply and infrequently irrigated bentgrass generally had a longer root length, larger root surface area and greater volume at 2.0 to 3.4 cm and 15 to 19 cm soil depths, when compared to LF-irrigated creeping bentgrass. When data were analyzed over the entire root system, DI-irrigated bentgrass had a longer total root length, larger total root surface area and greater root volume during entire experimental period than LF-irrigated bentgrass.