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Published online 31 January 2005
Published in Crop Sci 45:529-534 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Cool-Season Grass Development Response to Accumulated Temperature under a Range of Temperature Regimes

P. W. Bartholomew* and R. D. Williams

USDA-ARS, P.O. Box 1730, Langston Univ., Langston, OK 73050


Figure 1
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  		Fig. 1. Effect of temperature regime on mean phyllochron (GDD leaf–1) in Italian ryegrass (IRG), tall fescue (TF), and tall wheatgrass (TWG). Vertical bar indicates LSD = 9.3 (P = 0.05) for comparisons of means.

 

Figure 2
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  		Fig. 2. Effect of average daily temperature and daily temperature range on mean phyllochron (GDD leaf–1) in Italian ryegrass (IRG), tall fescue (TF), and tall wheatgrass (TWG). Vertical bar indicates LSD = 6.8 (P = 0.05) for comparison of means of average temperature or of daily temperature range treatments.

 

Figure 3
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  		Fig. 3. Effect of air temperatures of –2.5, –5.0, or –7.5°C and of insulation of Cone-tainers on the duration of exposure to air and soil temperatures of 0, –1, or –2.0°C of Italian ryegrass seedlings: AIR = air temperature indicated by probes positioned adjacent to seedling leaves, EXP = soil temperature indicated by probes inserted into soil in an uninsulated Cone-tainer, INS = soil temperature indicated by probes inserted into soil in a Cone-tainer insulated in a block of polystyrene.

 

Figure 4
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  		Fig. 4. Leaf appearance rate (leaves GDD–1) in Italian ryegrass following single or double 15-h exposure to minimum temperatures of –2.5 and –5.0°C, a single exposure to –7.5°C or in a control treatment maintained at the growth chamber temperature regime with minimum night temperature of 0°C. EXP = single 15-h exposure in uninsulated Cone-tainer, EXP2 = two 15-h exposures in uninsulated Cone-tainer, INS = single 15-h exposure in insulated Cone-tainer, INS2 = two 15-h exposures in insulated Cone-tainers. Vertical bar shows LSD = 0.0033 (P = 0.05) for comparison of means.

 




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