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Assessing the Reliability of Permanganate-Oxidizable Carbon as an Index of Soil Labile Carbon

Crop, Soil, and Water Sciences Div., IRRI, DAPO Box 7777, Metro Manila, Philippines

View larger version (17K): [in a new window]   Fig. 1. Standard KMnO4 calibration curves (KMnO4 concentration vs. absorbance at 565 nm).

View larger version (20K): [in a new window]   Fig. 2. Kinetics of organic C oxidation by 33 mM KMnO4 (0–24 h) at room temperature in various organic compounds: (a) sugars, (b) amino acids, and (c) organic acids.

View larger version (10K): [in a new window]   Fig. 3. Relationship of permanganate-oxidizable C (POC) in farmyard manure (FYM), rice and wheat straw, azolla and sesbania with their (left) lignin and (right) total C contents.

View larger version (22K): [in a new window]   Fig. 4. Kinetics of soil organic matter oxidation by 33 mM KMnO4 at room temperature in eight rice-field soils (** slopes are significantly different at the 1% level by the F test for homogeneity of regression coefficients).

View larger version (14K): [in a new window]   Fig. 5. Relationship between total C content and the oxidation rate of soil organic C by KMnO4 in eight rice field soils.

View larger version (20K): [in a new window]   Fig. 6. Relationship of soil permanganate-oxidizable C (POC) and total C in 10 different rice-field soils from the Philippines and rice-wheat field soils with different organic fertilizer treatments in two sites in India.

View larger version (19K): [in a new window]   Fig. 7. Scatter plots and linear regression of soil permanganate oxidizable C (POC) with (a) clay/OC, (b) silt/OC, and (c) clay + silt/OC.

View larger version (22K): [in a new window]   Fig. 8. Relationship of soil permanganate oxidizable C (POC) with (a) total C, (b) WSC, (c) MBC, and (d) MBC with WSC in eight rice-field soils.