Assessment of Hygienic Level of Alfalfa and Wheat Plants Irrigated with Wastewater Amended with Algae and Cyanobacteria at Taif Desert Soil

This study was carried out to investigate the effect of different waters; tap water (control), sewage effluent (100 % & 50 %), sewage effluent with Scenedesmus quadricauda and sewage effluent with Nostoc sp. on plant growth, leaf chlorophyll and Assessment of hygienic (fungi) of wheat and alfalfa plants. The obtained results showed that plant height, herb weight (fresh and dry), total chlorophyll content of both plants were inhibited at sewage effluent while enhanced in S. obliquus or Nostoc sp. enriched water. Exceptionally, dry weight of wheat was not affected at the same trend. It exhibited its highest enhancement at tap water/sewage mixture despite the enhancement of algae-amended waters. Also, sewage effluent was not obviously inhibitory. The algal cells may sorb (absorb or adsorb) water contaminants that might inhibit plant growth. Algae, in addition, most probably killed fungal cells to invade plant stems, which have been found in control and sewage effluent.