Nashmeel Saeed Khudhur Abdul-ghany Omer Ismaeel Sarmamy Journal of Raparin University - Vol.5, No.14, (March 2018) (75) p-ISSN (2410-1036) e-ISSN (2522-7130) A Study on Microbial Population under the Effect of some Pesticides in Different Soil Orders and Moisture Contents Nashmeel Saeed Khudhur* Abdul-ghany Omer Ismaeel Sarmamy** *Department of Environmental Science, College of Science, University of Salahaddin, Kurdistan Region, Iraq **Department of Biology, College of Science, University of Salahaddin, Kurdistan Region, Iraq Abstract The present study was designed to determine the effects of glyphosate, mancozeb and diazinon with three different soil orders and two soil moisture contents and their combinations on some soil microbial population in a pot experiment. The main results obtained at the last periods (4 th and 5 th samplings) of the study demonstrated as: glyphosate showed significant decrease in total actinomycetes and increased total bacteria, proteolytic bacteria and fungi. Mancozeb significantly decreased proteolytic bacteria and fungi. Diazinon significantly increased total bacteria and proteolytic bacteria. Agholan soil showed the greatest reduction in proteolytic bacteria, fungi and actinomycetes. Debaga soil significantly increased proteolytic bacteria. Girdarasha soil increased proteolytic bacteria, fungi and ac2nomycetes. 50% soil moisture content revealed significant increase in total bacteria and proteoly2c bacteria. 100% soil moisture content showed significant increase in actinomycetes. The interaction between P1S2 increased total bacteria and ac2nomycetes. The interac2on P1S3 increased proteoly2c bacteria and fungi. The combina2on P2S3 caused significant reduc2on in fungi and ac2nomycetes. The combina2on P2S2 revealed significant reduction in fungi and ac2nomycetes. The interac2on P2S3 showed the greatest increase in proteoly2c bacteria. The combina2on P3S1 reduced ac2nomycetes. The interac2on P3S2 increased total bacteria and proteoly2c bacteria. The combina2on P3S3 increased proteolytic bacteria. The combina2on CS1 showed decreasing effect on proteoly2c bacteria; CS2 showed decreasing effect on total proteoly2c bacteria; CS3 increased ac2nomycetes and decreased proteoly2c bacteria. The combina2on P1W1 increased total bacteria and fungi, whereas P1W2 increased ac2nomycetes and proteoly2c bacteria. The combina2on CW2 reduced proteoly2c bacteria and ac2nomycetes. The interac2on S1W1 decreased fungi, whereas, S1W2 reduced total bacteria and fungi. The interac2on S3W1increased total bacteria; the interac2on S3W2 caused the highest increasing in ac2nomycetes. The combina2ons: P1S2W1 increased total bacteria and ac2nomycetes; P1S2W2 increased ac2nomycetes; P1S3W1 increased total bacteria and fungi. The interac2on P2S3W2 http://dx.doi.org/10.26750/jru.1021