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Residue Accumulation and Changes in Soil Organic Matter as Affected by Cropping Intensity in No-Till Dryland Agroecosystems

^a Pontificia Universidad Catolica de Chile, Santiago, Chile
^b Dep. of Soil and Crop Sci., Colorado State Univ., Fort Collins, CO 80523

View larger version (33K): [in a new window]   Fig. 1. Soil organic C (SOC) and N (SON) content averaged over cropping systems as affected by the interaction of location [evapotranspiration (ET) gradient] and soil depth.

View larger version (27K): [in a new window]   Fig. 2. Change in soil organic C (SOC) and N (SON) by soil depth for the first 5-yr period (1985–1989) and the second 5-yr period (1989–1993) averaged over locations [evapotranspiration (ET) gradient] and cropping systems.

View larger version (31K): [in a new window]   Fig. 3. Soil residue quantity as affected by the interaction of soil depth and cropping system. WF, wheat–fallow; WCMF, wheat–corn (or sorghum)–millet–fallow.

View larger version (24K): [in a new window]   Fig. 4. Carbon and N quantities in the soil residue as affected by the interaction of soil depth and cropping system. WF, wheat–fallow; WCMF, wheat–corn (or sorghum)–millet–fallow.

View larger version (27K): [in a new window]   Fig. 5. Carbon and N content and C/N ratio of the residue as affected by position averaged over location [evapotranspiration (ET) gradient] and cropping system.

View larger version (21K): [in a new window]   Fig. 6. Quantity of surface and soil (0–2.5 cm depth) residue averaged over location [evapotranspiration (ET) gradient] as affected by the interaction of cropping system and residue position. WF, wheat–fallow; WCMF, wheat–corn (or sorghum)–millet–fallow.

View larger version (21K): [in a new window]   Fig. 7. Carbon and N in surface and soil (0–2.5 cm depth) residue averaged over location [evapotranspiration (ET) gradient] as affected by the interaction of cropping system and residue position on quantity. WF, wheat–fallow; WCMF, wheat–corn (or sorghum)–millet–fallow.

View larger version (25K): [in a new window]   Fig. 8. Surface and soil residue (0–2.5 cm depth) characteristics, averaged over location [evapotranspiration (ET) gradient] and cropping system. ADF = acid detergent fiber; * = significant at 0.05 probability level; NS = not significant at the 0.05 probability level.