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Tillering Studies in Oats II. Effect of Photoperiod and Date of Planting¹

Synopsis: Oat varieties grown under various light and temperature conditions produced different numbers of head bearing tillers. All of the varieties tested needed more than 12 hours of continuous photoperiod to produce heads within 90 days. Plants grown at 58° F. did not head as rapidly as those grown at 70° F. The number of head bearing tillers per plant decreased with increased planting rates. Delaying planting from early April until the first week in May increased the number of heads per plant while plantings made after the first week in May decreased rapidly in number of heads per plant.

² Assistant Professor of Agronomy and Botany and Plant Pathology and Professor of Agronomy, respectively, Iowa State College.

Received for publication November 9, 1956.