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Ion Exchange Resin Bags: Factors Affecting Estimates of Nitrogen Availability¹

ABSTRACT

Soil ion concentration, water regime, and microbial competition for N were examined for their importance in regulating the adsorption of ammonium and nitrate by ion-exchange resin bags. Resin nitrate values were largely dependent on soil nitrate contents, whereas resin ammonium values were strongly affected by soil water regime. Increasing microbial competition for N by additions of cellulose markedly decreased N accumulation in the resin bags. Recovery of ¹⁵NH₄ added to resin bags prior to incubation in the soil showed no indication of removal or transformation of N once adsorbed in the resin bags. Resin bags should be appropriate for field estimation of N availability when both mineralization and transport are of interest.

¹ Joint publication of the School of Forestry and Environmental Studies, Duke Univ., and the Dep. of Forest Science, School of Forestry, Oregon State Univ. Paper 1814 of the Forest Research Lab., Oregon State Univ., Corvallis, OR 97331.

² Assistant Professor, School of Forestry and Environmental Studies, Duke Univ., Durham, NC 27706.

Received for publication October 11, 1983. Accepted for publication April 6, 1984.

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