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The effect of polyacrylamide (PAM) (synthetic soil conditioners) application on soil microbial biomass C (Cmic) and N (Nmic) were examined under laboratory conditions. Two types of polymers Acqua-Kept (P1) and Super-Hydro (P2) were mixed separately with a loamy sand soil in various concentrations of 25, 50 and 100 μg g–1 soil. After 1, 7, 14 and 28 days of incubation, the soils were analyzed for Cmic and Nmic. The two PAMs have shown almost similar effects on the soil microbial biomass C and N. The amount of soil microbial biomass (Cmic and Nmic) was increased with the lower polymer applications of 25 and 50 μg g–1 soil, while it decreased at the higher dose of 100 μg g–1 soil addition. The response exhibited a parabolic curve. The response was found more pronounced with P2 than P1 application. A slight increase in Cmic and Nmic was observed with the advancement of incubation stages. The results indicate unpredictable changes in soil microbial biomass due to the application of different synthetic soil conditioners.
The wide utilization of copper in agriculture and industrial processes in addition to many other uses associated with human activities causes both point and non-point source pollution of the environment with copper. Although copper is relatively non-toxic to mammals and essential micronutrient necessary for a wide variety of prokaryotic and eukaryotic metabolic activities, is toxic to all organisms if present in elevated concentrations. Copper pollution in agricultural posing soils can adversely affect the living part of soil organic matter serious threat to sustained food and fiber production.
