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Evaluating Chemical and Physical Indices of Nitrogen Mineralization Capacity with an Unequivocal Reference

^a DNR, 80 Meiers Rd., Indooroopilly, QLD, 4068, Australia
^b Dep. of Resource Management and Horticulture, Univ. of Melbourne, Parkville 3052, VIC, Australia
^c CSIRO Land and Water, GPO Box 1666, Canberra 2601, ACT, Australia
^d International Atomic Energy Agency, P.O. Box 200, A-1400 Vienna, Austria

View larger version (16K): [in a new window]   Fig. 1. Gross amount of N mineralized (m) and consumed (i) from 19 Australian soils during waterlogged incubation for 2 wk at 30°C. Vertical bars represent standard errors of three replicates

View larger version (14K): [in a new window]   Fig. 2. Gross amount of N mineralized (m) and consumed (i) from 12 Australian soils during aerobic incubation for 2 wk at 30°C. Vertical bars represent standard errors of three replicates

View larger version (21K): [in a new window]   Fig. 3. Relationships between gross amount of N mineralization during waterlogged incubation for 2 wk at 30°C and indices of readily mineralizable organic N. TON: total organic N; DON: water-soluble organic N; LFN: light fraction N (r2 = 0.04, P > 0.05); KCL-N: KCl-hydrolyzable N; HCl-N: HCl-hydrolyzable N; and NaOH-N: NaOH-hydrolyzable N. r20.01 = 0.33 for the relationship of all measurements with gross N mineralized

View larger version (19K): [in a new window]   Fig. 4. Relationships between gross amount of N mineralization during aerobic incubation for 2 wk at 30°C and indices of readily mineralizable organic N. TON: total organic N; DON: water-soluble organic N; LFN: light fraction N (r2 = 0.0007, P > 0.05); KCl-N: KCl-hydrolyzable N; HCl-N: HCl-hydrolyzable N; and NaOH-N: NaOH-hydrolyzable N. r20.01 = 0.50 for the relationship of all measurements with gross N mineralized