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This article in AJ

  1. Vol. 50 No. 7, p. 389-392
    Received: Dec 9, 1957

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Response of Alfalfa Varieties to Daylength1

  1. B. L. Coffindaffer and
  2. O. J. Burger2



Growth rate of Vernal alfalfa was reduced most by reducing light period from 16 to 14 hours. Williamsburg contained a higher concentration of calcium and sodium than Vernal or Narragansett. Narragansett was highest in percent nitrogen, which increased in concentration for all varieties with a decrease in light period. Potassium concentration was about the same among the three varieties. Root weights were highest in the plants subjected to the 14-hour photoperiod.

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