El-Kharga oasis soils tend to alkaline, very poor in N, P and rich in Ca, Mg, Na, and K. The total algal
counts fluctuated, in the study sites (1 6), and ranged between 3.333 colonies/g soil for the plant
Hyoscyamus muticus and 4978.3 colonies/g soils for Plantago major. The high percentage of
cyanophyta (97.7%) was recorded around Oxalix erniculata, chlorophyta (84.1 5%) around Solanum
nigrum and diatoms (53.3%) around Langonychium farctum. On the other hand, the number of total
algal species in the study sites ranged between 2 and 1 6 species for Hyoscyamus muticus and
Langonychium farctum, respectively. No species belong to chlorophyta and bacillariophyta around the
root of Hyoscyamus muticus, Calendula micrantha and Ambrosia martema plants. The only one species
encountered high occurrence remark was Pseudoanabaena papilloterminat (Cyanophyta). Treatments
of Nostoc carneum with various soaked root extracts of Ambrosia maritima and Hoscyamus muticus
caused enhancement of the growth, especially with high concentration of the extract (5%).