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Thesis (M.S.)—University of Nebraska—Lincoln, 1949. Department of Agronomy.


Copyright 1949, the author. Used by permission.


It has been the purpose of this investigation to determine the progressive changes that occur in the growth of the soybean plant under normal field conditions, and especially to note variation among varieties in these respects. The plant characters under observation at successive intervals after emergence included (1) the green and dry weight of the entire plant (except the roots), the seed and the pods; (2) plant height; (3) time of flowering; (4) pod elongation; (5) percentage dry matter of the plant, the seed, and the pods; (6) time of seed maturity.

The soybean varieties were grown comparatively to study their growth characteristics. Periodic weight and length measurements were taken on representative random plants of each variety. Some varietal differences are indicated, and these are found to be related to earliness of variety. In all the varieties, the four plants characters, total moisture-free weight of plant, moisture-free weight of seed, length of atom, and length of pod, exhibited the normal growth pattern of most annuals, i.e., the daily increments of length and weight increased progressively during the first two-thirds of the growth period, followed by a gradual recession until their termination.

On the whole, before the early varieties began to mature, all varieties except H-5 and Illini gained in dry weight at rather similar rates. In general there was a direct relation between plant height and lateness of maturity. Although pod length varied significantly between varieties, there was no correlation between pod length and days to maturity. The rate of gain in moisture-free weight of the seed varied inversely with days to maturity.

Advisor: T.A. Kiesselbach.