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Rooted cuttings of poinsettia ( Euphorbia pulcherrima  willd.ex.klotzch cv. Eckespoint Freedom Red) were grown under 16-h photoperiod in plastic pots (6 inches in diameter) containing 1 sand: 1 Metro-Mix 500 (v/v) to determine the response of nitrogen fertilizer forms, concentrations, and delivery methods on plant growth and quality. Plant height, number of lateral shoots, and number of leaves were increased with osmocote 19N–6P–12K at the rate of 4 gdm –3  compared to 100–200 ppm of calcium nitrate (foliar spray), 60–100 ppm urea (foliar spray), 80–120 ppm of ammonium sulfate (soil drench), 100–140 ppm of poinsettia 20N–5P–19K (soil drench), and 8 gdm –3  of osmocote (slow release), showing superior plant growth. Data show that delivering nitrogenous fertilizers by foliar sprays tends to reduce plant growth with short plant stems and a low number of lateral shoots and leaves compared to soil drench application, with the exception of osmocote 19N–6P–12K at a rate of 8 gdm –3 . Plant quality factors such as the number of discolored or dead leaves and the degree of green coloration on the leaves were also affected by the form and delivery system of nitrogenous fertilizers.

630 The Effect of Nitrogen Fertilizer Form, Concentration, and Delivery System on the Growth and Plant Quality of Poinsettia