الفهرس 
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Abstract
A pot experiment was conducted using a sandy loam soil at El-Mansoura Laboratory of Plant Nutrition Research Department, Soil, Water & Environment Res. Institute of Agricultural Research Center, during the two successive summer seasons of 2004 and 2005 to evaluate the effect of high nitrogen levels (ammonium sulphate) as a soil application at rate of 0.0 %, 100 %, 125 % and 150 % N of the recommended dose in the presence or absence of boron or/plus molybdenum (75 ppm) as foliar applications (at volume of 52 cm3 per plant) after 3 days from every application of nitrogen fertilization on pepper (capsicum annuum L.) cultivar California Wonder as a sweet pepper and Fire Flam as a hot pepper, in addition to their interactions on vegetative growth characters, yield, chemical composition and fruit quality. The results indicated – generally – that high rates of nitrogen application were more effective than the recommended dose(100 %) on the vegetative growth parameters, yield, chemical composition and fruit quality. Application of higher levels of nitrogen (125 % and 150 %) led to a higher fruit yield production (3.81 %, 15.31 %- 3.67 %, 15.50 % g plant-1) for sweet variety(3.12 %, 5.58 %- 3.00 %, 5.50 % g plant-1) and for hot variety during 1st and 2nd seasons, respectively. Foliar spraying of pepper plants with B, Mo and B+Mo at concentration of 75 ppm were significantly increased vegetative growth parameters, led to improving the yield, content of N, P, K, B, Mo, V.C., total cholorophyll and significantly decreased nitrate and nitrite concentrations compared with untreated treatments. In general, application of ammonium sulphate at rate of 100 % to the soil and spraying pepper plants with B+Mo at rate of (75 ppm) recorded the maximum mean values of plant growth parameters, yield, improved V.C. in fruits at 100 % N as soil application and Mo spraying. On other hand, the lowest No3 and No2- N conc. resulted from Mo spray separately with 100 % N in fruit yield of the two pepper varieties in both seasons.