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Responses of Some Kentucky Bluegrasses to High Temperature and Nitrogen Fertility¹

Five Kentucky bluegrasses (Poa pratensis L.) were grown at three temperature regimes: 18 C light and 10 C dark; 27 C light and 18 C dark; 35 C light and 20 C dark; and two N rates (15 and 150 ppm N) in solution culture. High temperature increased respiration rates; consequently, plants with high carbohydrates best supported growth at high temperatures. Bluegrasses originating in warm regions appeared more tolerant of high temperatures because of higher carbohydrate levels, lower NO₃-N absorption, and lower foliar NO₃-N than those from cooler regions. Preconditioning at cool temperatures enhanced tolerance of all grasses to high temperatures. Management of grasses can also influence tolerance to high temperatures; however, genetic adaptation is of most importance for survival at high temperatures.

Key Words: Nitrate uptake • Carbohydrates • Inorganic nitrogen • Plant growth

² NDEA Pre-doctoral fellow in Agronomy, Associate Professor of Agronomy, and Professor of Agronomy, Virginia Polytechnic Institute, Blacksburg, Va.

Received for publication December 17, 1969.

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