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Modification of the Illinois Soil Nitrogen Test to Improve Measurement Precision and Increase Sample Throughput

Department of Crop and Soil Environ. Sci., Smyth Hall, Virginia Tech, Blacksburg, VA 24061

View larger version (13K): [in this window] [in a new window]   Fig. 1. Standard Illinois soil N test method (ISNT) vs. the modified method using an incubator with a diffusion period of 5, 6, 7, 8, 9, 10, and 15 h for a subset of selected sites (Sites 1–6, Table 1).

View larger version (7K): [in this window] [in a new window]   Fig. 2. Average percentage of Illinois soil N test (ISNT) N recovered using the incubator method with a diffusion period of 5, 6, 7, 8, 9, 10, or 15 h on a subset of selected sites (Sites 1–6, Table 1).

View larger version (11K): [in this window] [in a new window]   Fig. 3. Percentage of recovered N from the glucosamine standard (1 mg N mL–1) using the incubator method with a diffusion period of 5, 6, 7, 8, 9, 10, or 15 h.

View larger version (7K): [in this window] [in a new window]   Fig. 4. The relationship between measured N using the standard Illinois soil N test method (ISNT) vs. the modified method using an incubator with a 15-h diffusion period (INC15).