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Factors Influencing Seed Set of Oat Crosses¹

Synopsis: Worker's experience and low field temperatures were two important factors favoring seed set in oat crosses at Madison, Wis. High temperatures at 3 to 4-day intervals between emasculation and pollination decreased seed set. Optimum time interval was 1 to 3 days. More of the top florets set seed after short intervals, and more of the lower after long intervals. Opening and closing florets to remove 1 anther caused 30 to 50% reduction on hot days, but only 5 to 10% on cool days. Greater germination was observed by natural than by hand pollination.

² Formerly graduate student in Agronomy, University of Wisconsin, now Assistant Professor of Agronomy, University of Illinois; and Professor of Agronomy, University of Wisconsin, respectively.

Received for publication December 20, 1955.