Premium
Native Fixed Ammonium in Hawaiian Soils
Author(s) -
Mikami David T.,
Kanehiro Yoshinori
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200040019x
Subject(s) - soil water , ammonium , basalt , nitrogen , potassium , chemistry , volcanic ash , environmental chemistry , mineralogy , soil science , environmental science , geology , volcano , geochemistry , organic chemistry
Native fixed ammonium was found to range from 0 to 585 ppm. Volcanic ash soil horizons generally had a lower fixed ammonium content (4 to 178 ppm) than those from basalt (0 to 585 ppm). There was a general decrease of fixed ammonium concentration with depth in most of the profiles, this pattern of decrease being more pronounced in basaltic soils than in ash soils. Native fixed NH 4 ‐nitrogen as a fraction of total nitrogen in individual horizons varied from 0 to 32.9%. This fraction was generally much greater in the basalt soils than in the ash soils. The soils did not show any definite pattern in the profile as to the relative amount of nitrogen present as native fixed ammonium. There was a highly significant relationship between native fixed ammonium and total K 2 O and percent mica in both ash and basalt soils. This relationship, however, does not apply to young, partially weathered soils containing primary potassium‐bearing minerals. The difference between organic C/organic N and organic C/total N ratios was generally greater in basaltic soils than in ash soils.