الفهرس 
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Abstract
Melia azedarach L. (Fam. Meliaceae) and Albizia lebbek (L.) Benth. (Fam. Leguminosae, recently, Mimosoideae) trees are native to Asia and now cultivated and naturalized in most tropical and subtropical countries including Middle East. They are used for Firewood, Wood, Beautification, Ornamental, fooder and erosion control (Ayensu, 1981).
This experiment was carried out during 1998 and 1999 seasons at the Experimental Farm and Laboratory of the Faculty of Agriculture, EI-Minia University in order to investigate the effect of NPK fertilization and zinc treatments on the vegetative growth and chemical composition of Melia azedarach and Albizia lebbek seedlings grown in sandy soil. Four NPK fertilizer combinations (N0PoK0, N1P1K1, N2P2K2 and N3P3K3) were examined. The amounts of N0, N1, N2 and N3 were 0, 3.0, 6.0 and 9.0 g/bag of ammonium sulphate (20.6% N), while, P0, PI, P2 and P3 were 0, 2.1, 4.2 and 6.3 g/bag of single calcium superphosphate (15.5% P2O5) and those of K0, K1, K2 and K3 were 0, 1.5, 3.0 and 4.5 g/bag of potassium sulphate (48.5% K2O). The second factor tested in this investigation was the micronutrient zinc. Four zinc concentrations, were 0, 50, 100 and 200 ppm were studied. Different vegetative growth characters and chemical constituents were recorded.