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acid-treated seed acre Agricultural Research Service average tannin content blower bundles buyers collected for tannin collecting sumac contour crimson hairs cultivated crop dry weather Dwarf sumac Rhus farm crop favorable conditions field planting floor foliage furrows are opened growing sumac growth between harvest hairy underneath inches indicates the principal Iowa leaf stems leafage leaflets map indicates material from native material has dried method mower native sumac species obtained percent piled planting at Beltsville propagation and management Propagation From Root quality of sumac quantities raked root cuttings rows are laid Rows are spaced second season's growth seedlings Sicilian product small planting small stems source of tannin Staghorn sumac stalks stirring Sulfuric acid sumac leaf material sumac material sumac species collected Tannin extracted tannin production three native sumac three species thresher treated for weed underneath fig usually UTILIZATION OF WILD Virginia weed control well-prepared seedbed white sumac wild sumac wire-bottomed rack woody stems