Fertilization and spacing effects on growth of planted ponderosa pine
P. H. Cochran, R. P. Newman, James Willis Barrett, Pacific Northwest Research Station (Portland, Or.)
U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest Research Station, 1991 - Nature - 13 pages
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01 01 Fertilizer 6x6 9x9 Spacing 9x9 Spacing treatment AC horizon Additional fertilization analyses of covariance analyses of variance area and volume area Volume Spacing average height Barrett and Youngberg Basal area ft2/acre basal area growth Bitterbrush combinations in fall control half plots control treatments diameter growth Dougl F C F F indicates fertilization fertilization and spacing fertilized and control fertilized half plots fertilized treatments fertilized trees Fertilizer x period Fertilizer x spacing ft acre grams growth is related growth per acre height growth inches increased tree nutrition indirect effects manzanita older buried soil period table period x spacing periodic annual increments plots in space ponderosa pine probability for significance pumice quadratic mean diameter regressions related to initial snowbrush Spacing treatment 12x12 split plot study area test the hypothesis treatment 12x12 feet treatment-period combination Tree spacing feet U.S. Department Volume ft3/acre volume growth Volume Spacing 0.01 wider spacings Youngberg 1970