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Tob. Sci., 1982, 26-02, p. 4-8, ISSN. 0082-4523

Phytotron studies on tobacco seedling production. I. Effect on plant spacing on growth

GAWANDE M.; JOHNSON W.H.
Dept. of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC, USA

Six place spacings of 2.5 × 2 5, 3.8 × 3.8, 5 × 5, 7.6 × 7.6, 5 × 10 and 5 × 15 cm2 were tested for Asgrow pellets under day/night temperatures of 26/22 °C. Plants were grown in metal containers using a subirrigation system. Plants were harvested about six weeks after seeding and measured for several plant parameters. Results showed that most of the plant parameter values increased asymptotically with increasing plant spacings. Non-linear (negative exponential) regression equations were fitted. Plant parameters vs. spacing curves were smoother when the plots were made against the larger side of the spacing grid as compared to the plots against area per plant. Stem length, plant height, and stem weight were not influenced significantly by plant spacing. Plants at closer spacings tended to be more variable in size as compared to those at wider spacings, although the variability was not statistically significant.

(Full article published with kind permission from "Tobacco International")