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Six cultivars of poinsettia ( Euphorbia pulcherrima  Willd. `Angelika White', `Celebrate 2', `Freedom Red', `Lilo Red', `Red Sails', and `Subjibi Red') were grown for 9 weeks under three fertilizer treatments (80, 160, or 240 mg N/liter constant feed) and were either well-watered or water deficient between irrigations. Plant height decreased with decreasing fertilizer and with low vs. high irrigation treatments. Dry weight of all shoot components were reduced by deficit irrigation. For well-watered plants, leaf area and leaf dry weight increased from low to medium and decreased from medium to high fertilizer treatment. For plants under deficit irrigation, these variables were similar for low and medium fertilizer and increased at the 240 mg N/liter. Stomatal conductance and transpiration decreased with increasing fertilization level and deficit irrigation. Leaf chlorophyll content at week 5 was 40% and 49% higher for plants fertigated with 160 or 240 mg N/liter compared to 80 mg N/liter, while 2 weeks later these differences decreased to 20% and 26%. Irrigation had little influence on leaf chlorophyll content.

Whole-plant Response of Six Poinsettia Cultivars to Three Fertilizer and Two Irrigation Regimes