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12 indicates missing acre are greater ages 29 Average d.b.h. bar for plot clearly the beneficial close spacings codominant cubic volume d.b.h. ranges development of Douglas-fir Donald Douglas-fir stands planted effect of spacing effects of carrying effects of wide Fifty-year development Forest and Range ft3 per acre greater at wide Gross basal area height growth I0 I2 INITIAL I2 INITIAL SQUARE inches l4 cm INITIAL SQUARE SPACING l00 largest trees l2 ft l2-foot l2-ft spacing larger than 5.5 live trees mean annual increment merchantable trees number of trees number planted observations in stands Oregon Pacific Northwest Forest period between ages Plantation spacing growth planted at various plot 12 indicates Portland Range Exp Range Experiment Station Reukema seedlings six spacings spac spacing test SQUARE SPACING Feet stand component stand development total stand trees larger trees per acre trees relative trend curve USDA various spacings volume per acre wide initial spacing wide spacings