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Pakistan Journal of Biological Sciences
Year: 2000  |  Volume: 3  |  Issue: 4  |  Page No.: 549 - 551

The Influence of Synthetic Soil Conditioners on the Size of Soil Microbial Biomass in a Loamy Sand Soil

Ayman M. El-ghamry, Abid Subhani, Huang Changyong and Xu Jianming    

Abstract: 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.

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