Early Response of Ponderosa Pine to Spacing and Brush: Observations on a 12-year-old Plantation
William W. Oliver
јан 1979. · Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture
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Competition between trees in brush-free plots began during the eighth year for trees spaced 6 by 6 feet and during the tenth year for trees spaced 9 by 9 feet.
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