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Thesis (M.S.)—University of Nebraska—Lincoln, 1953. Department of Agronomy.


Copyright 1953, the author. Used by permission.


Statistical analyses of small grain yields (oats and winter wheat) covering a long period of time have not received much attention. The relative yield differences between two or more varieties fluctuate from year to year depending on the environmental factors and diseases present in any given year. Statistical methods can be used to measure and compare the sources of error, variation due to soil, season, etc.

One purpose of this paper is to show the average yield trends over a long period of testing and to show the fluctuations of varietal rank. The second purpose of this paper was to determine the relationship of varietal yield to some environmental factors and plant diseases.

Results of this study show significant differences exist in the average yields (oats and winter wheat) between different Nebraska counties for the 13-year period from 1938 to 1951. Some of the factors that affect yields ranged from type of plant used, disease, type of soil, and season.

Advisor: L. P. Reitz