Comparison of chamber and field germination tests of soybeans
1932
Cutler, G.H.
In a 4-year test ungraded seed of the Manchu variety of soybeans gave 5.04 +/- 0.57% better germination in the chamber than in the field, with 320 chamber tests and 480 field tests. During the same years ungraded seed of the Dunfield variety gave similar results on a limited number of tests. Three strains of the Manchu variety, viz., Nos. 29, 32, and 40, in a 4-year test, gave a significantly better germination (5.24%) in the field than in the chamber. Seed condition, seasonal conditions immediately following planting, and soil have an important bearing on the results obtained. Hard-seededness in a sample is a contributing cause in equalizing chamber and field germination. Non-germinable seeds, as revealed by the 8-day chamber test, may also have an effect similar to that of hard-seededness. Favorable temperature and moisture conditions following planting have a profound effect upon field germination and may be instrumental in causing the field germination to be as high or higher than the chamber germination. An analysis of these data helps to explain the rather current opinion prevailing among soybean growers that field germination in soybeans is often better than the chamber test would seem to warrant.
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