Effect of Nitrogen Source, Rate, Timing, and Application
Method on Creeping Bentgrass (Agrostis Palustris)Quality and Dollar Spot Incidence. (C05-street568188-poster)
Authors:
J.R. Street* - Ohio State Univ.
D.D. Holdren - Ohio State University P.J. Sherratt - Ohio State University
Abstract:
Nitrogen (N) is a primary nutrient to consider when implementing fertilization strategies on high maintenance turfgrass. Research on the performance of granular nitrogen applications for turfgrass quality and dollar spot (Sclerotinia homoeocarpa) incidence is plentiful but little research is available on the effects that foliar versus granular nitrogen applications produce. This study examined the
response of ‘Lopez’ creeping bentgrass (Agrostis palustris) to granular and foliar nitrogen applications at different rates and timings for turfgrass quality and dollar spot incidence. Experimental data shows foliar application rates of 6.13 kg N/ha and 12.25 kg N/ha monthly provided turf of unacceptable quality. The same rates applied bi-weekly provided better results and the 12.25 kg N/ha applied weekly provided the best turfgrass response among the foliar treatments. Between the granular
applications the 24.5 kg N/ha rate applied biweekly and the 49 kg N/ha applied monthly rate provided the best response. Higher N rates consistently resulted in less dollar spot in both granular and foliar applications. Weekly foliar applications at the 12.25 kg/h N rate resulted in the least dollar spot incidence. The higher rates and frequencies of the granular material resulted in less dollar spot severity than the lower rates.
Speaker Information: John Street, Ohio State Univ., 216 Howlett Hall 2001 Fyfee Court, Columbus, OH 43210; Phone: 614-292-9091; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 818)
Keywords: Foliar nitrogen applications; Granular nitrogen applications; Rates and timing; Quality and disease incidence
