Five-year Results of the Southwide Geographic Seed Source Study

A principal feature of the study is that at or near each source of seed, stock representing that source is tested in comparison with stock representing several other sources of the same species. The study does not, however, test every source at every other source. To keep seed requirements and and plantation layouts within bounds, sources were grouped in "series" to test hypotheses regarding the effects of temperature, evapotranspiration rate, gross soil differences, and plant migration upon the evolution of geographic races. Series within species are linked together by inclusion of certain sources that they share in common, and plantations representing both series have been established in the vicinity of such common or "link" sources.

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Author(s): Philip C. Wakeley

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1959