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Crop Science Abstract -

Responses of Some Kentucky Bluegrasses to High Temperature and Nitrogen Fertility1


This article in CS

  1. Vol. 10 No. 4, p. 372-376
    Received: Dec 17, 1969

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  1. T.L. Watschke,
  2. R. E. Schmidt and
  3. R. E. Blaser2



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.

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