Response of paperwhite narcissus plant to nitrogen and potassium fertilization levels under sandy soil conditions [electronic resource].

Includes reference.

This research included two experiments on paperwhite narcissus plant grown under sandy soil conditions at the Experimental Farm of Efficient Productivity Institute, Zagazig University. The first experiment was carried out during the two successive seasons of 2003104 and 2004/ 05 aiming to study the effect of four nitrogen levels (0, 50, ] 00, and 200 ppm). four potassium levels (0, 100, 200, and 300 ppm), as weekly doses in 200 cc solution! pot, and their interactions on characteristics of produced round and split bulbs. While, the second experiment was conducted during 2004/ 05 and 2005/ 06 seasons to evaluate the residual effect of the above mentioned treatments on subsequent vegetative growth, flowering and leaf chemical analyses of plants resulted from replanting the previously fertilized round bulbs which resulted from the first experiment. Among the tested fertilizer levels, nitrogen at J00 ppm or Kat 300 ppm applied each alone significantly increased circumference and dry weight of round bulb. The produced number of split bulbs/ plant was increased by 100 ppm N, while K at 100 ppm resulted in the highest dry weight of split bulb. Nitrogen at 100 ppm interacted with 200 ppm potassium level increased dry weight and circumference/ round bulb. Moreover, the same interaction treatment had the superior enhancing residual effect on subsequent flowering aspects (flowering stalk length, florets No/ plant and flowering plant longevity) as well as N(~o in leaf tissues of plants resulted from replanting fertilized round bulbs comparing to the other interaction treatments. Simple correlation coefficients under interaction treatments (N x K) effect exhibited positive and significant interrelationships between circumference of planted round bulb and leaf chemical constituents (N, P, K and total carbohydrates percentages) in resulted plant, as well as between plant leaf chemical constituents and its growth and flowering parameters.

Summary in Arabic.

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