title: Variations of Nitrogen-15 Abundance in Soils.
abstract: A survey of the isotopic composition of soil nitrogen has shown that there is variation in the abundance of nitrogen-15 in soils and in different forms of soil nitrogen. The variation detected is small, but it cannot be attributed to analytical errors and should be considered in studies of nitrogen transformation in soils when nitrogen-15 is used as a tracer.
authors.forename: H H
authors.initials: HH
authors.lastname: Cheng
authors.forename: J M
authors.initials: JM
authors.lastname: Bremner
authors.forename: A P
authors.initials: AP
authors.lastname: Edwards