A linear relationship was observed between the amount of total respiratory quinones and the microbial biomass measured by a fumigation-extraction method in 15 soil samples regardless of the significant differences in the composition of the quinone profiles, with one exception in a soil amended with a very high application rate of farmyard manure. It is suggested that the amount of total respiratory quinones can be used as an indicator of the microbial biomass in soil.
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Saitou et al. (1999) studied this question.
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