• Injection of nitrogen-15 into trees to study nitrogen cycling in soil 

        Contributor:Pregitzer, Kurt S.; Paul, Eldor A.; Horwath, William R.
        Date:1992-01
        Most 15N dilution techniques disturb either the soil or N-pool size. The objective of this study was to develop a method of labeling the roots of Populus trees with 15N without physically disturbing the soil. Such a method ...