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Soil Organic Matter Characteristics as Affected by Tillage Management

^a Dep. of Plant and Soil Sciences, University of Massachusetts, Amherst, MA 01003
^b USDA-ARS-Coastal Plains Soil, Water, and Plant Research Center, Florence, SC 29501
^c School of Natural Science, Hampshire College, Amherst, MA 01002

View larger version (24K): [in a new window]   Fig. 1. Cross-polarization magic angle-spinning total sideband suppression 13C NMR spectra of humic acids in a Norfolk soil under different tillages: (1A) conservation tillage treatment (CnT1, 0–5 cm; CnT2, 5–10 cm; and CnT3, 10–15 cm); (1B) conventional tillage treatment (CT1, 0–5 cm; CT2, 5–10 cm; and CT3, 10–15 cm).

View larger version (29K): [in a new window]   Fig. 2. Solid-state 13C NMR data under different tillage systems: (A) aliphatic-C (0–108 ppm); (B) carbohydrate-C (60–96 ppm); (C) aromatic-C (108–162 ppm); and (D) aromaticity (108–145 ppm)/(0–162 ppm).

View larger version (21K): [in a new window]   Fig. 3. Diffuse reflectance Fourier transform infrared spectra of humic acids in a Norfolk soil under different tillage treatments: (3A) conservation tillage treatment (CnT1, 0–5 cm; CnT2, 5–10 cm; and CnT3, 10–15 cm); (3B) conventional tillage treatment (CT1, 0–5 cm; CT2, 5–10 cm; and CT3, 10–15 cm).