Effect of operational fertilization on foliar nutrient content and growth of young douglas-fir and Pacific silver fir
U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1986 - Douglas fir - 10 pages
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1-acre plot 50 needles compared adjusted means annual basal area annual increase area per acre area Square feet average diameter average periodic annual Basal area Square bracken fern collected broken tops Cle Elum collected in 1980 concentration in bracken concentration in needles Conifer control and fertilized Control Fertilized control plots control trees Dougl feet per acre fertilization treatment fertilized and control fertilized plots fertilized trees Foliage age foliage was collected foliar nitrogen gression line inches for control inches per 50 increase in foliar initial basal area needle surface area needles from fertilized needles of Douglas-fir Needles were taken nitrogen concentration Pacific silver fir paired t-test periodic annual basal periodic annual increment plot is higher plotted points refer Prescribed rate regression line reported a sulfur significantly different significantly higher P<0.05 silver fir needles square inches Study areas subplots sulfur concentrations trees on fertilized U.S. Department volume per acre Wenatchee National Forest