A Study on Microbial Population under the Effect of some Pesticides in Different Soil Orders and Moisture Contents
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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 (4th and 5th 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 actinomycetes. 50% soil moisture content revealed significant increase in total bacteria and proteolytic bacteria. 100% soil moisture content showed significant increase in actinomycetes. The interaction between P1S2 increased total bacteria and actinomycetes. The interaction P1S3 increased proteolytic bacteria and fungi. The combination P2S3 caused significant reduction in fungi and actinomycetes. The combination P2S2 revealed significant reduction in fungi and actinomycetes. The interaction P2S3 showed the greatest increase in proteolytic bacteria. The combination P3S1 reduced actinomycetes. The interaction P3S2 increased total bacteria and proteolytic bacteria. The combination P3S3 increased proteolytic bacteria. The combination CS1 showed decreasing effect on proteolytic bacteria; CS2 showed decreasing effect on total proteolytic bacteria; CS3 increased actinomycetes and decreased proteolytic bacteria. The combination P1W1 increased total bacteria and fungi, whereas P1W2 increased actinomycetes and proteolytic bacteria. The combination CW2 reduced proteolytic bacteria and actinomycetes. The interaction S1W1 decreased fungi, whereas, S1W2 reduced total bacteria and fungi. The interaction S3W1increased total bacteria; the interaction S3W2 caused the highest increasing in actinomycetes. The combinations: P1S2W1 increased total bacteria and actinomycetes; P1S2W2 increased actinomycetes; P1S3W1 increased total bacteria and fungi. The interaction P2S3W2 increased actinomycetes. The interactions: CS3W1 caused significant increase in actinomycetes; and CS3W2 showed significant increase in actinomycetes.