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Organic Matter and Aggregate Size Interactions in Infiltration, Seal Formation, and Soil Loss

^a Inst. of Soil, Water, and Environmental Sci., The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, 50250, Israel
^b Faculty of Sci., Univ. of La Coruna, A Zapateira s/n, 15071 La Coruna, Spain

View larger version (29K): [in a new window]   Fig. 1. Infiltration rate as a function of cumulative rainfall for the two soils characterized by different organic matter (OM) content and the three different aggregate sizes. Bars indicate standard deviation.

View larger version (108K): [in a new window]   Fig. 2. Photographs of the surface before and after a rainstorm of 80 mm for the two soils with different organic matter (OM) content and different aggregate sizes.

View larger version (22K): [in a new window]   Fig. 3. Dispersion index (DI) of the two soil samples with differing organic matter (OM) contents and three different aggregate sizes. Bars indicate standard deviation, and different letters above the columns indicate significant differences ( = 0.05) among the treatments.

View larger version (98K): [in a new window]   Fig. 4. Scanning electron micrographs of the crust and the soil beneath it, for the soils with two organic matter (OM) content and <2-mm aggregates.

View larger version (104K): [in a new window]   Fig. 5. Scanning electron micrographs of the crust and the soil beneath it, for the soils with two organic matter (OM) content and 4- to 6-mm aggregates.

View larger version (30K): [in a new window]   Fig. 6. Interrill soil loss for the two soils characterized by different organic matter (OM) content and the above the columns indicate significant differences ( = 0.05) among the treatments.