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The Aeration‐Recovery Method for Determining Ammonium Fixation by Soils Under Moist Conditions
Author(s) -
Leggett G. E.,
Moodie C. D.
Publication year - 1962
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/sssaj1962.03615995002600020019x
Subject(s) - aeration , soil water , ammonium , chemistry , fixation (population genetics) , significant difference , ammonia , environmental chemistry , mineralogy , analytical chemistry (journal) , soil science , mathematics , environmental science , biochemistry , organic chemistry , statistics , gene
A method for determining NH 4 fixation by soils under moist conditions is described. Alkaline aeration in the presence of K is used to remove the soluble and exchangeable NH 4 from NH 4 ‐treated soil. The liberated NH 3 is collected in standard acid and determined by titrating with standard NaOH. The NH 4 fixed by the soil is obtained from the difference between NH 4 added and that recovered. Comparative data presented for several soils indicate that NH 4 fixation values obtained by the proposed method agree with those obtained by determining the difference in N content of NH 4 ‐treated and untreated samples after extracting with KCl solution to remove the soluble and exchangeable NH 4 . Data are presented which indicate that NH 4 fixation by soils may be measured with a precision of ±0.1 me. per 100 g. by the proposed method.