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Nitrogen concentration and form effects on leaf tissue concentrations and lower leaf expansion of Lilium longiflorum 'Nellie White'

Whipker, B.E., Barnes, J., McCall, I., Gibson, J., Poole, H.
Acta horticulturae 2011 no.900 pp. 125-132
Lilium longiflorum, NPK fertilizers, ammonium nitrate, copper, fertilizer rates, irrigation water, leaf area, leaf development, leaves, manganese, nitrogen content, nutrient content, plant growth, zinc
In a first experiment, the effect of increasing nitrogen fertilization rate (200, 300 or 400 mg•L-1 N) on leaf tissue concentration of Lilium longiflorum ‘Nellie White’ was studied over the 15-week production cycle. Nitrogen rate × sampling time significantly influenced the leaf tissue N, P, K, S, Cu, Mn, Mo and Zn concentrations. A second experiment compared the irrigation water fertilization practice of applying NH4NO3, Ca(NO3)2.4H2O, or 13-2-13 Cal-Mag (13N-0.86P-10.8K) at concentrations of 200 or 400 mg L-1 N on the lower leaf growth. Eight weeks after potting, plants were analyzed for growth, individual leaf area of bottom 50 leaves, and nutrient composition. All fertilizer types and concentrations had no effect on leaf dry weight or leaf area for the first (leaves 1 to 10) and second (leaves 11 to 20) group of bottom leaves. The application of 200 mg L-1 N resulted in a greater amount of leaf area for leaf segments 21 to 30, 31 to 40, and 41 to 50, than with 400 mg•L-1 N. Leaf area for segments 31 to 40 and 41 to 50 of lilies treated with the complete fertilizer 13-2-13 Cal-Mag were greater than either NH4NO3 or Ca(NO3)2.4H2O treated plants. These results suggest the practice of applying high concentrations of NH4-NO3 does not promote leaf expansion, and prolonged use of this incomplete fertilizer can limit plant growth.