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This article in AJ

  1. Vol. 64 No. 4, p. 491-493
    Received: Nov 5, 1971



Effect of Day/Night Temperature on Seedling Establishment of Nicotiana tabacum L. in Controlled Environments1

  1. Mohammed Haroon,
  2. R. C. Long and
  3. J. A. Weybrew2



The trend toward mechanized planting or transplanting of tobacco necessitates that seedling establishment (germination and initial growth to the first leaf stage) occur rapidly, at a uniform rate, and at high percentage. The effect of nine day/night temperature combinations on seedling establishment of flue-cured tobacco, Nicotiana tabacum L. ‘NC 2326,’ was studied under controlled conditions. Seeds were sown and germinated in temperature-controlled greenhouses, and daily counts were made to determine the number of seedlings whose first leaf had emerged. Little difference in total seedling establishment (percentage) or in uniformity of rate (standard deviation of the mean days-to-establishment) was found between the 26/26, 26/22, 22/22, and 22/18 C day/night temperature treatments. The rates of seedling establishment (mean days-to-establishment) between most treatments were different. Day/night temperatures of 26/22 C resulted in the best overall response with respect to total, rate, and uniformity of rate of seedling establishment.

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