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Toxicity symptom of micronutrients copper, magnesium and zinc were investigated for geranium, marigold, vinca and zinnia. Plants were grown in peat-lite mix in 11 cm plastic pots and watered with nutrient solutions containing 0.05, 0.5, 1, 5, 10 mM concentrations of Cu 2+ , Mg 2+  and Zn 2+ . In most species, the concentrations of these micronutrients higher than 5 mM greatly reduced plant growth and induced stem and foliar toxicity symptoms. Toxic levels of Cu 2+  and Zn 2+  reduced plant and leaf sizes without producing leaf spots in all species tested. Toxicity symptom of Mn 2+  were characterized by numerous chlorotic or brown leaf spots. Visual leaf toxicity symptoms of these 3 micronutrients in each species are illustrated.

TOXICITY SYMPTOMS OF MICRONUTRIENTS COPPER, MAGNESIUM AND ZINC FOR SELECTED BEDDING PLANTS