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This article in AJ

  1. Vol. 82 No. 2, p. 354-356
    Received: June 20, 1989

    * Corresponding author(s):


Nitrogen Contamination of Soils from Sampling Bags

  1. N. R. Kitchen,
  2. L. A. Sherrod,
  3. C. W. Wood,
  4. G. A. Peterson and
  5. D. G Westfall 
  1. Dep. of Agronomy, Colorado State Univ., Ft. Collins, CO 80523



Soil samples can be contaminated with N by storage in bags described by the manufacturer to contain a wax laminated glassine liner (WLG). This study was conducted to compare samples stored in a WLG sample bug and a polyethylene bag (POLY). Sandy and clay loam soils were brought to three different moisture contents representing wet, moist, and dry, approximately 0.20,0.06, and 0.01 kg H20 kg−1 soil, respectively, and stored in the WLG and POLY sample bags for 12, 48, and 120 h. Sample bags and soils were extracted for NH4−N and NO3−N with 2 M KCI. Extraction of shredded WLG and POLY bags gave 189.4 and 1.7 mg NH4−N kg−1 bag, and 12.5 and 0.3 mg N03−N kg−1 bag, respectively. Ammonium-N concentration increased in both soils (from 4-42 mg N kg−1 soil) when stored either moist or wet in the WLG bag. The moist clay loam and the wet sandy loam increased 9 and 15 mg N03-N kg−1 soil, respectively, when stored in the WLG bag for 120 h. The WLG bag should not be used for soil samples. All bags should be checked for N contamination prior to use.

Contribution from the Dep. of Agronomy, Colorado State Univ.

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