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100 RESIDUAL STAND 120 square feet 34.5 Crown Release 5-year d.b.h. increase 5-year growth period 60 square area per acre average stand diameter basal area growth BASAL AREA/ACRE Buckman CENTRAL FOREST EXPERIMENT compartment was thinned Crown thinning cutting method density and cutting DENSITY SQ diameter growth rate effect on average ences feet of basal feet per acre four plantations growth after thinning growth in Plantation illus inches d.b.h. inches in Plantation increase in Plan index were nearly initial thinning Mean d.b.h. mean stand d.b.h. mean stand diameter ning North Central Forest plots in Plantations plots thinned Pole thinnings red pine plantations Remove every third replicated Residual basal area residual densities RESIDUAL STAND DENSITY row-thinned plots selected trees selective thinnings site index stand diameter growth suppressed trees tation thinned selectively thinned to 140 thinned to 30 thinning in Plantations thinning method third period third row U.S.D.A. Forest Serv unthinned plots