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12 indicates missing 12 INITIAL SQUARE 24-year period 53 Average 53 ranged ages 29 Average d.b.h. Average height bar for plot close spacings codominant trees crown cubic volume d.b.h. ranges diameter growth Douglas-fir Plantation Douglas-fir stands planted effect of spacing Figure ft3 per acre Gross basal area growing space height growth I0 I2 INITIAL inches l4 cm increases with increased indicates missing data INITIAL SQUARE SPACING l0 ft l0-ft-spaced plots l00 largest trees l2 ft l2-foot l2-ft spacing larger than 5.5 live trees mean annual increment merchantable trees merchantable volume minimum top diameter number of trees number planted Oreg period between ages planted at close plot 12 indicates Portland Range Exp spac space on bar spacing plot spacing test spacing trial SQUARE SPACING Feet stand component tarif total stand trees Average trees larger trees per acre trees planted trend curve USDA variation volume per acre wide spacings wider