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Direct-Diffusion Methods for Inorganic-Nitrogen Analysis of Soil

^a Dep. of Natural Resources and Environ. Sci., Urbana, IL USA
^b Dep. of Crop Sci., Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801 USA

View larger version (24K): [in a new window]   Fig. 1 Effect of prolonging the diffusion period on direct analysis of inorganic N in soil. Accelerated diffusions were performed in triplicate on 1 g of soil after addition of 10 mL of 2 M KCl, for 1.75 h (the recommended period) or for an additional 1, 2, or 4 h. The standard deviation for replicate analyses ranged from 0.22 to 1.59 mg N kg-1