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Effect of Ammonium Fixation on Estimation of Soil Mi-crobial Biomass NitrogenEnglish Full Text

YIN SHI-XUE; FENG KE; CHENG CHUAN-MIN; QIAN XIAO-QING; and HU JIAN(Department of Agronomy, Jiangsu Agricultuml College, Yangzhou 225001 (China))

Abstract: The effect of ammonium fixation on the estimation of soil microbial biomass N was studied bv thestandard fumigation-incubation (FI) and fumigation-extraction (FE) methods. NO3-N content of fumigatedsoil changed little during incubation, while the fixed NH in soils capable of fixing NH increased withthe increase of K2SO4-extractable NH4-N. One day fumigation increased both extractable NH and fixedNH. However, prolonged fumigation gave no further increase. One day fumigation caused significant loss ofNO3-N, while prolonged fumigation caused no further loss. For soils tested, the net increases of fixed NHin fumigated soil equaled to 0-94% of NH4-N flush measured by the FI method, and 1-74% of extractable Nmeasured by the FE method, depending on different soils. It is concluded that the ammonium fixation wasone of the processes taking place in soils during fumigation as well as incubation after fumigation and shouldnot be neglected in the estimation of microbial biomass nitrogen by either FI or FE method.
  • Series:

    (D) Agriculture

  • Subject:

    Fundamental Science of Agriculture; Agronomy

  • Classification Code:

    S154.38

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