Production of Top White', 'Peterstar Pink', lilo Red', and 'Red Success' poinsettias were evaluated in a treatment combinations that included 10 compost blends, three compost levels, and two commercial soilless substrates of Sun shine Mix 1 and Pro Gro 300S as controls. The compost feed stocks included PSG polymer dewatered biosolids (PSG), lime dewatered biosolids (CP), yard trimmings(YT), poultry litter(PL),and municipal solidwaste(MSWBedmininster). The PSG, PL, YT, and MSW were co-blended with CP on a 2:1 ratio (v/v), all other composts were co-blended on a 1:1 ratio (v/v). The compost levels of 33%, 50%, and 67% were mixed with peat perlite (1:1, v/v). There were five replicates per treatment. Plants were fertilized once weekly with 200 mg«L_1 N from 21N2.2P-16.6K. Sunshine mix produced control plants that had greater canopy diameter and plant grade than Pro Gro mix. Plant height was reduced as compost level increased from 33%to67%. Blends of PSG:PL at the33% and 50% levels and PSG:YT at the 33% level produced premium-quality plants. Good-quality plants, similar to those grown in Sunshine Mix, were produced with the PSG or PL compost blended with immature MSW at the 33% level; PSG:PL blend at a 67% level; PSG:YT blend atthe 50% and 67% levels; and PLYT blend atthe 33% level.
Keywords: Biosolids (PSG) Pro Gro mix. PSG:YT Plant height Sun shine Mix 1