الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The procedure of this research was to conduct three pot trials in increasing controlled conditions, with the aim of evaluating the overall harmful environmental impacts and beneficial agronomic influences of applying different combinations of organic and chemical N fertilizers to sandy soil using leafy vegetables. In each trial, one or more of these harmful and beneficial influences of nitrogen were examined moving from broad-based glasshouse vegetable trial using watercress for two seasons to a more controlled laboratory leaching pot trial and culminated in an incubation trial run under the same conditions.
All three experiment were conducted in the glasshouse at Faculty of Agriculture, Minia University in the period from June 2011 till the end of 2011. The entire experiments were maintained under glasshouse conditions with a day and night temperature of 35 10 oC. The experiments was performed with different combinations of organic and inorganic fertilizers to evaluate its suitability for fertilization of a sandy soil used in the cultivation of watercress without nitrogen environmental pollution. The organic fertilizers (two composts) and inorganic fertilizer (ammonium nitrate 33%) were then added to the sandy soil alone at the rates of 0.0, 60, 120, 180 kg/ feddan, and in equivalent combinations with each other on a dry weight basis at the same rates by two methods of application (Broadcasting and incorporating) in all three experiments.