Abstract
Abstract At age 15, unthinned cottonwood (Populus deltoides Bartr.) planted at four spacings ranged from 7.5 to 12.1 inches average d.b.h. Initial spacings were 4' x 9', 8' x 9', 12' x 12', and 16' x 18' on Commerce-Convent soils. Mean annual cubic-foot volume increment by spacings in trees ≥5.0 inches d.b.h. peaked from year 9 to 13 and ranged from 277 to 313 cubic feet per acre per year. Yields from three thinning treatments did not exceed unthinned mean annual increments for a given spacing. Board-foot mean annual increment in trees ≥12.0 inches d.b.h. to a 10-inch top ranged from 60 to 370 board feet per acre for unthinned plots and from 100 to 420 board feet per acre for thinned plots when averaged over spacings.
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