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ABSTRACT
An ion exchange resin bag technique was compared to six other methods for estimating N availability. Under a controlled greenhouse environment and with well-mixed soils, the resin technique correlated well with more traditional N-availability indices. However, resin bags on site in three forest stands yielded different N-availability estimates than those in the greenhouse. This suggests that the resin bag method may be sensitive to on-site conditions not discerned by more widely accepted laboratory techniques.
1 Joint publication of the Woodlands Services Division, MacMillan Bloedel Limited, and the Dep. of Forest Science, School of Forestry, Oregon State Univ. Paper 1729 of the Forest Research Laboratory, Oregon State Univ., Corvallis, OR 97331.
2 Formerly Graduate Research Assistant, Dep. of Forest Science, School of Forestry, Oregon State Univ., Corvallis; now Research Associate, School of Forestry and Environmental Studies, Duke Univ., Durham, NC 27706.
3 Formerly Graduate Research Assistant, Dep. of Forest Science, School of Forestry, Oregon State Univ., Corvallis; now Postdoctoral Fellow, Forest Entomology, North Carolina State Univ., Raleigh, NC 27650.
Received for publication January 3, 1983. Accepted for publication April 15, 1983.
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