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Effect of ammonium fixation on estimation of soil microbial biomass nitrogen


, : Effect of ammonium fixation on estimation of soil microbial biomass nitrogen. Pedosphere 4(4): 321-329

The effect of ammonium fixation on the estimation of soil microbial biomass N was studied by the standard fumigation-incubation (FI) and fumigation-extraction (FE) methods. The NO3-N content of fumigated soil changed little during incubation, while the fixed NH4+ in soil capable of fixing NH4+ increased with the increase of K2SO4-extractable NH4-N. One day fumigation increased both extractable NH4+ and fixed NH4+. However, prolonged fumigation gave no further increase.

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