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. r²_0.01 = 0.33 for the relationship of all measurements with gross N mineralized