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acid acre areas average bales beds Bogalusa bordeaux mixture brown spot cankers carbon disulfide catch crops cause cones cost culling damage damping-off dewinged drought effective estry feet fertilizer foliage Forest Expt Forestry fusiform rust germination green manure green manure crops hardwoods height growth illus inches increase initial survival injury Johnson Tract Jour kill kiln larvae less lifting lings loblolly pine longleaf pine longleaf seedlings moist moisture content morphological grades mycorrhizae nitrogen nursery soil nursery stock nurseryman nutrient oaks percent percentage physiological quality pine plantations plantable plantations planted southern pines planter planting slit pounds pruning reduce require samples sawfly seed seedbed shortleaf pine slash pine South southern pine nursery southern pine region southern pine seedlings sowing spacing species spraying stands storage studies subgrades temperature tests thinning tion total number treatment trees U. S. Dept U. S. Forest Service usually weeds