RESPONSE OF 4 ORNAMENTAL SHRUBS TO CONTAINER SUBSTRATE AMENDED WITH 2SOURCES OF RAW PAPER-MILL SLUDGE

Four deciduous ornamental shrubs {'Coral Beauty' cotoneaster (Cotoneas ter dammeri C.K. Schneid.), 'Flaviramea' dogwood (Cornus sericea L.), 'Lynwood' forsythia (Forsythia xintermedia Zab.), and 'Variegata' weig ela [Weigela florida (Bunge) A. DC.]} were grown in trickle-irrigated containers with 100% pine bark (control) or with 10 other pine-bark-am ended media, including two sources [Noranda Forest (NF) and Quebec and Ontario (QO)] of raw paper mill sludge mixed at 15 % or 30 % (by volu me). All species grew equally well or better in the sludge-amended med ia than in the control or other nonsludge media. Cotoneaster and forsy thia grew more in NF sludge media than in corresponding QO media due p rimarily to the greater quantities of N and other nutrients released f rom the NF sludge.