Growing Food: A Guide to Food Production

Figure 4. The Nitrogen Cycle

Three kinds of soil bacteria are involved in the Nitrogen Cycle:

1. Nitrifying bacteria, such as Nitrosomonas (which convert ammonium ions to nitrite
   ions) and Nitrobacter (which oxidise nitrite ions to nitrate ions). They feed on
   humus and animal excreta to produce soluble compounds that are available to
   plants.

GROWING FOOD – THE FOOD PRODUCTION HANDBOOK 7