Department Bulletin, Edițiile 151-175

acid Agriculture amount areas average yields bands bark beetles Black loam black locust black walnut board feet bushels cactus catalpa cent cones cord corn cost cottonwood crop cultivation damage Deerlodge Deerlodge National Forest Douglas fir Drasterius early Engelmann spruce European larch experiments fall plowing farm foot fruit germination grain grass green ash ground growing grown growth height hemlock injury insects Iowa June killed land large number larva larvæ less loam lodgepole pine logs maple material mature moisture content National Forest Nephi substation nitrogen Norway spruce obtained plantations planting plats pounds precipitation production region roots sample sandy loam Sassafras season seed seedlings soil solution southern sowing species spring spruce stand subsoil sulphuric surface Table thinning timber tion U. S. Dept usually vanillin varieties weeds white pine winter wheat wireworms wood pipe yellow