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Date of this Version

1939

Document Type

Thesis

Citation

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

Comments

Copyright 1939, the author. Used by permission.

Abstract

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

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