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An Automatic Darkbox to Induce Flowering in Short-Day Plants in Midsummer¹

An inexpensive darkbox has been developed that will automatically provide short days. A 4-week exposure to a 10-hour day supplied by this unit will induce floral primordia in up to 140 3-week-old potted plants of pearl millet. Most "day neutral" and short-day millets so treated and given temperatures of 35 to 40°C in the greenhouse will reach anthesis in the summer about 50 days after planting.

² Research Geneticist, Plant Science Research Division, Agriculture Research Service, U.S. Department of Agriculture, and the University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Station; and Assistant Agricultural Engineer, University of Georgia, Georgia Coastal Plain Experiment Station, Tifton, Georgia.

Received for publication February 11, 1971.