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Four poinsettia cultivars were planted in root media containing 0%, 25%, or 50% (by volume) of coal bottom ash or aged hardwood sawdust. Bract color development in `Supjibi' was delayed in media containing sawdust or ash by up to 8–12 days. Bract color initiation of `Jingle Bells' and `Success' occurred earliest in media containing 25% sawdust, but color development was delayed in 50% coal ash. Color development in `Dark Red Hegg' was not affected by ash or sawdust. Analysis of combined leaves from all four cultivars showed Fe levels below normal where media contained sawdust. Leaf Mo concentrations increased with increased media sawdust to above the normal range, but Mn levels were below the normal range in sawdust media. Leaf Ca levels were below normal in all media, possibly due to excessively high K levels in media and leaves. When fertilizer concentration and frequency were adjusted to media EC levels, control media (0% ash or sawdust) required 100 ppm N once a week. Media containing sawdust required 300 ppm to maintain EC levels between 1.25–2.25 dS·m –1  and coal ash media were irrigated with water following the sixth week after planting due to EC levels &gt;2.25.

PERFORMANCE OF FOUR POINSETTIA CULTIVARS IN ROOT MEDIA CONTAINING COAL BOTTOM ASH OR AGED SAWDUST