الفهرس 
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Abstract
The Results of the increasing trophicThe present investigation was undertaken to give a general impression of the Bile water characteristics at the study site [El-Minia] likely to influence the growth and composition of three main algal groups and had as its prime objectives the role played by two nutritive elements (N and P) when supplied in various concentrations on the growth and composition of algal populations. The following conclusions were reached:
[1] The total algal counts were conspicuous at the study site, with the Bacillariophyta the most abundant in April, November and December 1986.
[2J The total algal counts were much more pronounced in October, November and December, 1987.
[3] The Maximum algal counts throughout the whole period of study were displayed in December 1987, while sharp reduction in their total counts were observed in July months compared with those recorded in the other months of the study period.
[4J The data reveal the incorrospondency between the denisty of algal population and water temperature throughout the whole period of study.
[5J The pH values of the Nile water were always on the alkaline side throughout the whole period of study.
[6J The maximum level of dissolved oxygen recorded in December 1987 was associated with the maximum algal counts
[7J Considerable changes in the concentration of N. P, Sit Ca and Kg were manifested during the study period.
state of Nile water . the role played dy nitrogen or phosphorus when supplied alone or in combination for a period of seven days on phytoplankton composition was also considered in this investigation.