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Tolerance to alkalinity was evaluated in Rose `Pink Cupido', Vinca `Apricot Delight', Chrysanthemum `Miramar', and Hibiscus `Bimini Breeze' and `Mango Breeze'. Plants were potted in a sphagnum peat moss-based growing medium and irrigated with water containing 0, 2.5, 5, 7.5 and 10 m m  of Na bicarbonate. In rose, shoot mass was significantly decreased and chlorosis increased at the 5 m m  treatment, indicating that the alkalinity toxicity is between 2.5 and 5 m m . In chrysanthemum, the concentration of Na bicarbonate did not significantly affect shoot mass, but caused a significant increase in leaf chlorosis at 5 m m  or higher Na bicarbonate. This indicates an alkalinity toxicity level between 2.5 and 5 m m . In Vinca, shoot dry mass was not affected significantly, but leaf chlorosis was significantly increased with 5 m m  of Na bicarbonate. This indicates an alkalinity toxicity level between 2.5 and 5 m m . In hibiscus `Mango Breeze', shoot mass was significantly increased at 2.5 and 5 m m , but was significantly decreased at 7.5 m m  and above. Leaf chlorosis was significantly increased with a concentration of 5 m m  and above, indicating that in hibiscus `Mango Breeze' the alkalinity toxicity level is between 5 to 7.5 m m . In hibiscus `Bimini Breeze', shoot mass was not significantly reduced, but leaf chlorosis exhibited a significant decrease at 7.5 m m . this indicates that in hibiscus `Bimini Breeze' the alkalinity toxicity level is between 7.5 and 10 m m . Growing medium pH increased with increasing levels of Na bicarbonate. The species showed varying capacity for acidification of the growing medium. All species, except rose and vinca, neutralized the alkalinity effect of 2.5 m m , but none of the species neutralized the effect of 5 m m  and higher Na bicarbonate.

Determination of the Alkalinity Toxicity Limits of Selected Greenhouse Ornamental Plants