Turkish Journal of Agriculture & Forestry, cilt.19, sa.1, ss.51-58, 1995 (Scopus)
The naturally fixed ammonium varied between 45.5μg/g and 251.3 μg/g. The highest amounts of ammonium fixation were found in the soils of Corum, followed by the soils of Cankiri and Ankara regions. The amount of native fixed ammonium varied between 4.5-39.9% of the total nitrogen contents of the soils. Moreover, statistically significant correlations have been found between the amount of native-fixed ammonium wth the clay, lime contents, and cation change capacity of the experimental soils. -from English summary