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Tillage and Row Position Effects on Water and Solute Infiltration Characteristics

^a Dep. of Ag. Chem. and Soil Sci., Univ. of Sydney, Sydney NSW, Australia, 2006
^b USDA-ARS, National Sedimentation Lab., P.O. Box 1157, Oxford, MS, USA, 38655

View larger version (21K): [in a new window]   Fig. 1. Bulk density, averaged over replications and tillage treatments, as a function of depth in a Grenada silt loam for the trafficked (TRK) and nontrafficked (UTK) interrows. Error bars indicate ± LSD(0.05)/2. Note the maximum in bulk density at about 0.1-m depth.

View larger version (80K): [in a new window]   Fig. 2. Example blue dye patterns. (a) Example of preferential macropores flow, 300-mm depth, 4.1% dyed area. (b) Example of preferential area flow, 152-mm depth, 21.5% dyed area. Circle drawn is the original position of the infiltration ring.

View larger version (18K): [in a new window]   Fig. 3. Average fraction of blue dyed area for the treatments: (a) tillage, (b) crop, (c) row position.

View larger version (24K): [in a new window]   Fig. 4. Relationship between ponded infiltration rate and maximum depth of dye flow, indicating a stronger relationship for the tillage than for the no-tillage treatment.

View larger version (23K): [in a new window]   Fig. 5. Adsorption curves for Brilliant Blue FCF dye on the A, Bw and Bx horizons fitted with a linearized Freundlich isotherm. Retardation factors were calculated from the linearized Freundlich adsorption coefficients, Kd values.