Performance and Persistence of Japanese Cool-Season Forage Grasses in the Central Great Plains of Oklahoma, USA

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  • グレートプレーン中部における日本育成寒地型牧草品種の生育特性と永続性.

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In this study, the performance of nine Japanese coolseason grass cultivars representing five species were evaluated in central Oklahoma, USA. Forage production, persistence data and climatological data were obtained to identify the performance of Japanese cool-season forage grasses and their possible use as a breeding resource. Data from the four year study indicate 'Akimidori' orchardgrass, 'Nanryo' tall fescue, 'Harusakae' meadow fescue and 'Shiwasuaoba' Italian ryegrass have value and a capacity for additional breeding improvements for both central Oklahoma and Japan. 'Akimidori' orchardgrass, 'Nanryo' tall fescue and 'Harusakae' meadow fescue each exhibit tolerance to drought and heat stress. As a consequence, these cultivars indicated good persistence in the years evaluated. 'Shiwasuaoba' annual ryegrass, by virtue of its early maturity, escaped periods of drought and heat stress in central Oklahoma and was well suited to no-till forage-grass-vegetable rotations. Multi-year performance testing of Japanese cool-season grasses in the climatic extremes of central Oklahoma provide a useful selection tool for drought and heat tolerant germplasm for both Japanese and American breeding programs.

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