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The Aeration-Recovery Method for Determining Ammonium Fixation by Soils Under Moist Conditions¹

ABSTRACT

A method for determining NH₄ fixation by soils under moist conditions is described. Alkaline aeration in the presence of K is used to remove the soluble and exchangeable NH₄ from NH₄-treated soil. The liberated NH₃ is collected in standard acid and determined by titrating with standard NaOH. The NH₄ fixed by the soil is obtained from the difference between NH₄ added and that recovered.

Comparative data presented for several soils indicate that NH₄ fixation values obtained by the proposed method agree with those obtained by determining the difference in N content of NH₄-treated and untreated samples after extracting with KCl solution to remove the soluble and exchangeable NH₄.

Data are presented which indicate that NH₄ fixation by soils may be measured with a precision of ±0.1 me. per 100 g. by the proposed method.

¹ Contribution from the Department of Agronomy, Washington State University, Pullman. Scientific Paper No. 2086. Washington Agr. Exp. Sta. Project No. 1253. Part of a thesis submitted in partial fulfillment of the requirements for the Ph.D. degree. Research reported here was done as part of Western Research Project W-31 with 12 Western States and the Agricultural Research Service, USDA, cooperating.

² Soil Scientist, Western Soil and Water Management Research Branch, ARS, USDA, Prosser, Washington; formerly Junior Soil Scientist at Washington State University; and Professor of Soils, respectively.