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A new technique for determining the presence of preferential flow paths in a nonstructured soil profile is described. The presented method is easily applicable in the field, and is based on the formation of an intensely colored complex of I2 with starch. Moreover, the method can be applied to all kinds of nonstructured soils, irrespective of their color. An illustration of the technique is given in case of water and solute movement in a water‐repellent soil, where formation of preferential flow paths was known to occur.

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