Dry Matter Accumulation Patterns and Seed Yield Components of Two Indeterminate Soybean Cultivars
1982
Beaver, J. S. | Cooper, R. L.
The Maturity Group II soybean [Glycine mar (L.) Merr.] cv. Corsoy often produces seed yields in central Illinois that are equal or greater than many full-season, Maturity Group I11 cultivars. A field study was conducted during two growing seasons at Urbana, Ill. in order to gain a better understanding of the yield physiology of Corsoy. Dry matter accumulation patterns of various plant parts, leaf areas, seed yields, and seed yield components of Corsoy were compared with those of Maturity Group I11 cv. Williams. Corsoy accumulated seed dry weight more efficiently than Williams by producing seed yields as great as or greater than Williams with less leaf area and less total vegetative dry weight than Williams. Although Corsoy produced less leaf area than Williams, crop growth rates of Corsoy and Williams were similar. This suggested that Corsoy possessed a greater net assimilation rate than Williams. Although Corsoy reached harvest maturity (RS) 2 weeks earlier in the growing season than Williams, duration of the seed filling periods of Williams and Corsoy were similar. Differences in seed yield were attributed to differences in rates of seed dry weight accumulation per unit-area. Corsoy accumulated reproductive (seed and pod wall) dry weight at a greater rate than Williams by setting a greater number of pods containing at least one seed. Corsoy initiated reproductive development earlier in the growing season than Williams which resulted in Corsoy accumulating less vegetative dry weight and leaf area than Williams. The results suggested that earlier reproductive development might enable the pod filling period to be lengthened without affecting the harvest maturity date.
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