الفهرس 
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Abstract
0Four field experiments were carried out during 1986/1987 and seasone at the experimental farm faculty of agriculture , minia university , the main objective of the present study was to evaluate five nitrogen fertilization levels ,foliar spray , with GA. And Mn On Three barley Varieties.
Experiment I:
Effect Of Nitrogen Fertilization levels on Three barley Varieties””
A split plot desing with three replicates was used where the three barley varieties ,I.E. Giza 121,cc 163 and cc. 89 were assigned to the main plots , while nitrogen fertilization assigned to the sub plots (10.5 m
experiment II : the in fluence of GA3 and Mn on barley