Hereditary variation as the basis for selecting superior forest trees /

Cold weather and glaze damage to forest plantations in southern Illinois / by W.R. Boggess and F.W. McMillan.

“…Stripping is more likely to occur as this angle approaches 90 degrees. Trees having a branch-stem contact angle of near 90 degrees are superior, from the standpoint of self-pruning, to those trees on which the angle is more acute (5).…”

Proceedings of the Seventh Southern Conference on Forest Tree Improvement, June 26-27, 1963, Gulfport, Mississippi

“…Let us assume a heritability of 30 percent this means that we can expect yield increases of 4 to 6 percent simply by confining selection to the top 20 percent of our stands. 4 Now let us add to this the increase in yield and quality associated with the reduction in compression wood. By appropriate selection, we might improve the straightness of our trees to achieve a reduction in average compression wood of as much as 25 percent.…”

“…The types of reaching equipment now in use (and the number of orchards using them) are: ladder (7 plus others not answering questions); ladder with bicycle wheels (2); ladder, truck mounted (4); ladder, trailer mounted (3); ladder, tractor mounted (4); and elevated platforms on truck (4).…”

Photochemical studies on unsaturated ketones

“…An ecotype is a distinct race resulting from the selective action of a particular environment, and a cline is a pattern of genetloal variation in which the differences of a character or characters are graded in a definite direction in geographic space (Dorman 1952 …”