The compost was produced using soiled sawdust bedding mixed with assorted animal tissues and actively composted for at least six months and cured for six to ten months.

Five substrate treatments that consisted of four different ratios of ATC and Canadian sphagnum peatmoss were formulated, all containing 20% medium grade horticultural perlite.

Four species [geranium (Pelargonium ×hortorum ‘Maverick Red’), marigold (Tagetes erecta ‘Inca II Yellow’), pansy (Viola ×wittrockiana ‘Delta Premium Yellow Blotch’), and petunia (Petunia ×hybrida ‘Prostrate Wave Purple Improved’)] were evaluated with weekly plant measurements.

Geranium and petunia exhibited 100% survival for all treatments. Marigold and pansy showed 100% survival for the control treatment (0% ATC) and the treatment with the smallest amount of ATC (20% ATC). Treatments for pansy and marigold with more than 40% ATC exhibited 40% to 90% survival.

All ATC substrate treatments produced the same number of flowers and buds as the control in geranium, marigold, and petunia, while the treatments containing 20% to 60% of ATC for pansy exhibited more flowers and buds than the control.

Measurements of pH and electrical conductivity (EC) varied based on treatment.

Based on the species and the ratios of peat, ATC, and perlite tested, ATC has the potential to be a peat extender in floriculture substrates when used in ratios of 20% or less.

Source: Kristin L. Getter and Dale W. Rozeboom, American Society for Horticultural Science