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TURFGRASS SCIENCE

Management Strategies during the Establishment Year Enhance Production and Fitness of Seeded Bermudagrass Stolons

Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546

* Corresponding author (dwilliam{at}ca.uky.edu)

Bermudagrass [Cynodon dactylon (L.) Pers.] is an important turfgrass across the transition zone. A common concern is survival of seeded cultivars the first winter after establishment. The objective of this study was to determine the optimum seeding and N rates to enhance stolon production. The cultivar Mirage was seeded in June of 1998 and 1999 at 12.2, 24.4, 36.6, and 48.8 kg pure live seed (PLS) ha^-1. Urea nitrogen was applied as a split-plot treatment at the rates of 48.8, 195.2, 390.4, or 585.6 kg N ha^-1 growing season^-1. Fresh weights of stolons harvested at the end of both growing seasons were greatest at 12.2 kg PLS ha^-1 rate, and decreased significantly as seeding rate increased. The same response to seeding rate was evident when measuring stolon diameters in both years of the study. In 1999, 585.6 kg N ha^-1 produced more stolons than 48.8 kg N ha^-1, indicating a significant positive linear response to N. The opposite was true with stolon diameters, there being a negative linear relationship with total N applied. There were no differences among seeding rates on production of total nonstructural carbohydrates (TNC), but 390.4 kg N ha^-1 produced the most TNCs, showing a significant quadratic response to N. No winterkill was observed in either year of the study.

Abbreviations: PLS, pure live seed • TNC, total nonstructural carbohydrates

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