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Published online 1 July 1972
Published in Agron J 64:491-493 (1972)
© 1972 American Society of Agronomy
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Effect of Day/Night Temperature on Seedling Establishment of Nicotiana tabacum L. in Controlled Environments1

Mohammed Haroon, R. C. Long and 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.

Key Words: Total seedling establishment • Rate of seedling establishment • Uniformity of seedling establishment rate

1 Paper No. 3609 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh. N. C. This study was supported in part by National Science Foundation Grant 19650 and a grant from the R. J. Reynolds Tobacco Company.

2 Former Research Assistant, Assistant Professor, and Professor, Crop Science Department, North Carolina State University, Raleigh, N. C. 27607.

Received for publication November 5, 1971.




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Copyright © 1972 by the American Society of Agronomy.