Ion Exchange Resin Bags: Factors Affecting Estimates of Nitrogen Availability1
- Dan Binkley2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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