| Abstract: |
This work was carried out during two winter seasons of 2000/2001 and 2001/2002 at El-Khattara, Experimental Farm, Fac. Agric., Zagazig University , to study the effect of plant density (2, 4 ,6 , 8 plants around dripper), foliar spray with salicylic acid ( 0, 100, 200 ppm), boron (0, 35, 70 ppm) and copper (0, 50, 100 ppm) on growth, plant chemical composition, yield and its components, bulb quality and storability of onion under sandy soil conditions.Spraying onion plants with salicylic acid at 100 ppm were significantly increased dry weight of bulb, total , marketable and pickles yield/ fed and average bulb weight. Moreover ,spraying onion plants with 100 or 200 ppm were significantly decreased weight loss percentage in bulbs during storage period. Low plant density of onion ( two plants around dripper) gave the highest values of dry weight of bulb, whereas high plant density eight plants around dripper gave the highest plant height and total, marketable and pickles yield / fed and the lowest sprouting percentage in bulbs during storage period. The interaction between salicylic acid at 200 ppm and plant density at eight plant around dripper gave the total and marketable yield / fed. The interaction between salicylic acid at 100 or 200 ppm and plant density at six or eight plants around dripper recorded minimum sprouting percentage in bulbs during storage.
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