Three Waste-Derived Composts Compared in Container Substrates
Organic wastes and composts are increasingly being advocated for use in potting mixes (Chong, 1999; Hoitink, 1999). Before these materials can become widely accepted by commercial producers, it is important to demonstrate efficacy in a wider assortment of usage and mix ratios.
This study compared the response of dogwood (Cornus alba ‘Sibirica’), forsythia (Forsythia ×intermedia ‘Lynwood’), and weigela (Weigela ‘Nana Variegata’) grown for one season in #2 containers filled with one of 18 waste-derived substrates. The substrates were formulated from spent mushroom compost (SMC), turkey litter compost (TLC), and municipal waste compost (MWC), each at rates of 25%, 33%, and 50% (by volume) mixed respectively with 50%, 33%, and 25% paper mill sludge (PMS), plus 25%, 33%, and 25% of a supplemental ingredient [bark (B) or sand (S)]. There were also two control mixes: 100% bark and 80 bark : 15 peat : 5 topsoil (by volume), a proven nursery mix. Nutricote 16-10-10 T140 controlled-release fertilizer
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