Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Biochemistry

The objective of this study is to evaluate the effect of sulphur addition, fertilization of ammonia gas, ammonium nitrate or urea on biochemical components and pungency of onion plants grown on salt affected soil. Two field experiments were carried out on salt affected soil clay loam in texture at the farm of Tamyia, Elfayoum governorate during two agricultural successive seasons i.e. 2013/14 and 2014/15 on onion (Allium cepa) plant (cv. Giza 20) to investigate the effect of elemental sulfur, some sources of nitrogen and organic compost on the biochemical components grown on salt affected soil. The obtained data representing the responses of onion plants to the application of elemental sulphur rates and different sources of nitrogen at maximum growth stage. Data indicated a relative difference between sulphur rates application (without, 100 and 120 Kg S fed-1), where at rate 100 Kg S fed-1showed slightly increase for chlorophyll a, chlorophyll b, total chlorophyll and carotenoids. Data showed that the sulphur at rate 100 Kg S fed-1 was the best rate for total amino acids, free amino acids and total protein according to the mean values 41.9 mg g-1 as total amino acids, 7.60 mg g-1as free amino acids and 13.82% as total protein. As mentioned before, the response of pungency (pyruvic acid) and bulb quality as (pyruvic acid, total carbohydrate and total soluble solid), yield and yield components of onion plant for the sulphur rates (120 Kg S fed-1) have the same behavior where the application sulphur rate 100 Kg S fed-1 was the most favourable treatment

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