Abstract

Hybrid bermudagrass (Cynodon dactylon [L.] Pers. × C. transvaalensis Burtt Davy) (HBG) is a water efficient warm-season turfgrass increasingly adopted in cool-season and semi-arid regions due to climate change and the demand for reduced irrigation inputs. However, prolonged winter dormancy limits its visual quality (verdure) and seasonal performance. This thesis evaluated multiple management strategies to modify dormancy dynamics and improve off-season turf quality in a cool-season environment. Field experiments assessed the effects of growth covers, fertilizers, colorants, surfactants, organic acids, and overseeding with cool-season species on HBG dormancy over two seasons. Dormancy responses were quantified using normalized difference vegetation index (NDVI), canopy cover, and visual ratings. Across studies, growth covers were the primary factor influencing dormancy dynamics, extending fall greenness and accelerating spring green-up by approximately 50 d compared to non-covered HBG. Fertilizer and amendment applications improved visual turf quality but did not consistently delay fall dormancy onset or hasten spring transition. Overseeding with perennial ryegrass (Lolium perenne L.) or Kentucky bluegrass (Poa Pratensis L.) enhanced fall and early winter green color. Collectively, these findings demonstrate that microclimate modification via growth covers is the most effective strategy for extending the functional growing season of HBG in cool-season climates, whereas fertility programs and overseeding serve as complementary practices to enhance aesthetic quality during dormancy.

Degree

College and Department

Life Sciences; Plant and Wildlife Sciences

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