الفهرس 
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Abstract
The objective of this study was to investigate the effects of organic fertilizers represented as wheat. straw or Eichhornia crassipes as well as inorganic fertilizer in the form of ammonium sulphate, on the growth and metabolism of canola, safflower and sunflower plants at different stages of plant growth and development by mixing them separately with the different types of new reclaimed soils. Growth and chemical compositional changes in the yielded seeds from the variously treated plants were also carried out. The results of the three conducted experiments showed that the observed responses of growth of canola, safflower and sunflower plants as well as of the yield of seeds from the three tested plants were dependent on (1) the type and the concentration of the fertilizer used, (2) the type of soil used and (3) the age of the tested plants. Treatments of canola, safflower and sunflower with various fertilizers (organic or inorganic) led to marked increase in all of the growth criteria of shoots and roots throughout the developmental stages of the three tested plants. Also, the yield of the plants was improved. Supplementation of the three tested soils with different types of fertilizers induced an increase in photosynthetic pigments (chl ”a”, chl ”b” and carotenoids) of the three tested oil plants comparing with that of untreated ones. The changes in Hill reaction were similar to that of photosynthetic pigments.