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Sulfur Deficiency In Poinsettia, Mary E. Dale, Ellen T. Paparozzi, James D. Carr

Department of Agronomy and Horticulture: Faculty Publications

Cuttings of Euphorbia pulcherrima Willd. ex Klotzsch ‘Dark Red Annette Hegg’ were grown hydroponically in minus S Hoagland’s solution modified to supply 0, 1, 2, 4, or 8 mg S/liter for 8 weeks. Nutrient solution changes; visual observations, sampling of tissue, and measurement of electrical conductivity and pH were done every 2 weeks. Deficiency symptoms appeared after 4 weeks of growth in treatments supplying 0 or 1 mg S/liter and occasionally in treatments supplying 2 mg S/liter. Symptoms included reddening of the petiole and main vein of new leaves followed by yellowing of these leaves. Leaf tissue S levels ranged …