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Evaluating Nitrate Recovery by Ion-Exchange Resin Bags

USDA Agric. Res. Stn., 1636 E. Alisal St., Salinas, CA 93905

*Corresponding author.

ABSTRACT

Ion-exchange resin (IER) bags were tested as traps for leached soil NO^–₃-N. In laboratory experiments, IER bags recovered 84.7% of the NO^–₃-N from solutions containing 0.09 to 40.74 g NO^–₃-N kg^–1 resin, but recovery decreased at higher concentrations. In soil columns, NO^–₃-N recovery was poor (36.2%) when NO^–₃-N moved slowly through the soil profile after a rapid single pulse, but improved (87.1%) when higher flow was sustained. In the field, estimates of leached NO^–₃-N using IER bags fell within the range of values estimated from soil cores and suction lysimeters. Advantages of IER bags are attributed to cumulative recovery of NO^–₃-N during passive interception of gravitational water flow.

Contribution of the Dep. of Vegetable Crops, Univ. of California, Davis, CA 95616.

Received for publication August 28, 1992.

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