Green Waste Compost as a Component in Soilless Growing Media

Green waste compost (GWC) was examined for its suitability as an ingredient in soilless growing media by measuring nutrient content, nutrient retention and physical properties. Growing media were formulated from GWC, composted pine bark and pumice, with suitable additions of lime and fertilizer. Nutrient concentrations, electrical conductivity and pH were measured in the media, which were used to grow tomato plants. Plant dry weight was used to assess media performance. Mixes with 30% (by volume) GWC, 50% composted pine bark, 20% pumice, 3g/l dolomite lime and 3 - 4g/l controlled release fertilizer performed as well as conventional barkpumice mixes.