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Crop Tree Measurements in Thinning Experiments

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While analysing the growth measurements of 2,200 trees from 27-year old northern white pine thinning plots, the authors found that those trees selected as potential crop trees did not show a decided increase in the percentage basal area increment per acre comparable to that found for all trees in the plots. Furthermore, the basal area increment for the crop trees in thinned plots was similar to that for the crop trees in the control plots when put on the percentage basis. The percentage increase in the total basal area for all trees on the thinned plots showed the treatment given the experimental plots to be highly beneficial in increasing the amount of wood area produced per acre during a four-year period. This difference in result depending on method of analysis was found also for measurements of the diameter, height, live crown width, and live crown depth of 28-year old jack and red pines growing in pure plantations of different densities of stocking. It was apparent that the conclusions which could be drawn from growth studies in experimental plots of young stands for short periods might be different depending on whether the data showed the results for all trees in the plots or just selected potential crop trees which specific treatments are intended to benefit.

Document Type: Journal Article

Affiliations: Vermont Agricultural Experiment Station

Publication date: June 1, 1942

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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