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acre applied Authority STATE Soil average beds bundles chemical CIAL clipped CM CM Code numbers COMMER conifers cottonwood coulter counting density depth Douglas-fir effect exposure fertilizer Forest Nursery FOREST TREE NURSERIES Fraser fir fumigation Georgia germination grade growing season hardwood height growth I I I inches increased Jour July Land CIAL lifting loblolly pine loblolly seedlings longleaf method methyl bromide moisture content moss mulch Nurseryman O O O O operation packing Pennsylvania Percent Percent Percent Pinus plantation planting machine planting stock plots ponderosa pine PUBLIC OTHER FOREST red pine root rot sampling sawdust seedbed shipped shortleaf shortleaf pine slash pine sowing species spruce square foot Superintendent State Forester temperature tractor transplants treatments Tree Planters tree seed trencher U.S. Department U.S. Forest Service Virginia pine weed control white spruce Yes Yes Yes