Vol. 55

Title:
Use of Paper-Mill Sludges and Municipal Compost in Nursery Substrates

Authors:
Calvin Chong and Peter Purvis

pp: 428-432

Abstract:
Municipal compost (Hicklenton et al., 2000) and both raw and composted papermill sludges (Campbell et al., 1991; Chong and Cline, 1994) are increasingly being promoted for use in nursery substrates. This study compared raw paper-mill sludge with various composts derived from paper-mill sludges (two sources) and municipal waste (one source), and determined optimum rates of these materials in binary mixtures with bark or hemp chips. The chemical composition of these materials is shown in Table 1.

Silverleaf dogwood (Cornus alba ‘Elegantissima" syn. ‘Argenteo-marginata’), forsythia (Forsythia ×intermedia ‘Lynwood Variety’), and weigela (Weigela ‘Red Prince’) were grown in #2 (6-L) containers filled with 100% bark or bark mixed with 20%, 40%, or 60% by volume each of raw paper-mill sludge (RB group); Bio Soil

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