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This article in CS

  1. Vol. 10 No. 4, p. 372-376
     
    Received: Dec 17, 1969
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040017x

Responses of Some Kentucky Bluegrasses to High Temperature and Nitrogen Fertility1

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

Abstract

Abstract

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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