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Articles by Xu Jianming
Total Records ( 2 ) for Xu Jianming
  Ayman M. El-ghamry , Abid Subhani , Huang Changyong and Xu Jianming
  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.
  Abid Subhani , Ayman M. El-ghamry , Huang Changyong and Xu Jianming
  There are different factors that affect soil microbial biomass, including: soil factors (such as soil physical and chemical properties), soil environmental factors (such as temperature, moisture, pH etc.), and soil management factors (such as use of chemical fertilizers, heavy metals, pesticides, addition of organic matter, cultivation and crop rotation, seasonal variation, tillage, land use etc.). This review is mainly focusing on the pesticides particularly herbicides as a factor affecting the microbial biomass in different soils. The influence of herbicides on microbial biomass in different soils under different conditions has been reviewed. Herbicides have various effects associated with the type of herbicides, the concentration of the herbicides, the type of soils, and the conditions of the experiment (temperature, moisture, and the time of incubation etc.). The significance of these effects has been discussed.
 
 
 
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