Cihan University-Erbil Scientific Journal a periodic multidisciplinary scientific journal issued by Cihan University- Erbil after auditing and revising by a specialized staff headed by the President of the university. The journal publishes original creative researches related to all fields of pure and applied sciences and humanities in Kurdish, Arabic and English.
Authors: Dalshad.A. Darwesh, Amel. F. Ibrahim Dept. of Environmental Sciences University of Salahaddin-Erbil DOI: http://dx.doi.org/10.24086/cuesj.si.2017.n2a21 Abstract A laboratory experiment was conducted to assessment the effect of oil refinery residues on enzymatic activity in two textured soils. The both soil samples sandy loam and clay treated with crude oil residues levels …
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