الفهرس 
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Abstract
The Aim Of The Present Work Is To Study The Role Of Humic Acid And Eddha In The Mineral Nutrition Of Cu, Fe And Zn In Nile Suspended Matter And In Sand Cultures. Results Obtained Reveal That The Affinity Of Humic Acid For Cu Exceeds That For Fe And Zn At Ph 4.0 Whereas The Affinity Of Fe Exceeds That For Cu And Zn At Ph 5.5 And 7.0. The Stability Constants Of Humic Acid Metal Complexes Increase With Ph And Follow The Order Cu>Fe>Zn At Ph 4.0 And 5.5 Where It Is Fe>Cu>Zn At Ph 7.0. Humic Acid Affects Nutrient Uptake Differently In Sand Culture.