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Fig. 1. Wetting front patterns in a coarse loamy sand soil (24 h after the end of water application): (a) bromide tracer, before spray; (b) bromide tracer, 2 h after spray; (c) iodide tracer, before spray; (d) iodide tracer, 1 h after spray. The patterns are invisible on wet soil background in (a) and (c). After spraying, they are visualized by the Prussian blue color (with bromide as tracer) in (b) and dark blue-violet color (with iodide as tracer) in (d). The scale on the right-hand side is in 10-cm increments.
