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Develops a technique to permit the use of boric acid indicator solution in carrying out inorganic nitrogen analysis in soil extracts. Accuracy of isotope-ratio analysis; Use of mass spectrometers for nitrogen isotope analysis; Determination of inorganic forms of nitrogen in soil extracts.

Presents diffusion methods to determine different forms of nitrogen (N) in soil hydrolysates. Reason for developing diffusion methods; Comparison of diffusion and steam-distillation methods; N-distribution analysis of soil hydrolysates by distillation and difffusion.

Investigates whether Mason-jar diffusion methods for determination of inorganic nitrogen in soil extracts can be applied directly to the soil sample itself. Evaluation of the precision and analytical accuracy of the method; Comparison with inorganic nitrogen analysis by extract-diffusion.