M¨ader et al. (2002)
showed that soils under organic farming regime had higher microbial functional diversity than those
under conventional farming system. Soil amendments of crop residues or other organic materials were
shown to affect the functional diversity of soil microbial community (Bending et al., 2002). However, few
studies are available on how different chemical fertilizers will influence the soil microbial characteristics
in the black soil.