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Thesis (M.S.)—University of Nebraska—Lincoln, 1939. Department of Agronomy.


Copyright 1939, the author. Used by permission.


The purpose of the studies reported in this thesis were: (1) to determine the uniformity of size and shape of seed which must be attained to give good planting results with planter plates which implement companies manufacture; (2) to determine the nature and extent of the variation in seedlings produced from various sizes and shapes of hybrid seed by: (a) sprout-value determinations, which in this study have been designated as the moisture-free weight of the maximum plant growth derived from the seed when grown in the essentially nonnutritive sand (quartz) medium in absolute darkness; (b) emergence of the seedlings from several depths of plantings; (c) emergence of the plants at different planting dates; (d) size of the seedling when planted at a normal depth and date; (e) obtaining yield from the various grades of seed.

Three Nebraska certified double crosses were used in this study with the seeds uniformly graded for thickness and width. A study of the dropping accuracy for all grades was made to insure sufficient uniformity of size and shape within a grade to give good planting results.An electric motor was attached to a nationally known make of planter so that the planting mechanism was run steadily at a rate comparable to field planting.The kernels were dropped on a revolving belt so that each drop could be noted.

Advisor: T. A. Kiesselbach