Samples of water-hyacinth were collected from the main stream of Nile river near the location of El-Kanater El-Khayria. Plant samples were taken at three intervals; March, August and December during growing seasons of 1992 and 1993. The harvested plants were divided into leaves, stems and roots and were subjected for general analysis of crude protein, ash, crude fat, fibres and nitrogen free extract.
Also, sugars and carbohydrates were determined in the different plant samples. Plant sterns showed maximum reducing sugars content, whereas the highest concentration of non-reducing and total sugars were recorded in the leaves. The mineral analysis revealed that sodium, potassium magnesium and calcium were found in relatively higher level, iron, zinc and manganes were measure in moderate concentration, while copper, lead and cobalt were detected in plant tissues in minor amounts. The content of the determined minerals were depended mainly on the sampling date and the plant organ,