(1) Ammonium-oxidizing bacteria (Nitrosolobus sp.) were counted every 2 days for 28 days in the top 5 cm of a soil at Rothamsted. The population density fluctuated with an amplitude of 1-7 x 104 cells g -. These fluctuations were mainly associated with changes in soil moisture content. (2) The mean standing crop was 8.7 x 103 cells g-' (15ngg'1; 9.3gha-' freshweight). Mean cumulative biomass production was at least 79 ng g(51 g ha1) per 28 days; net biomass production was negligible. (3) Doubling times for populations were 8-78 h (mean 32.5 h).
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R. M. Macdonald (1979) studied this question.
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