1. The seasonal fluctuations in the nitrate and
ammonia content of some soils from Boghall Glen
have been studied.
2. There is no very marked increase in the nitrate
content in spring, but in late summer the increase
is very marked.
3. This summer increase in nitrate content appears
to be connected with the much higher temperature
prevailing in that season.
4. The relation of nitrifying powers to the quality
of the pasture is discussed.