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Short-term effects of amaranth, maize and sunflower (Amaranthus hypochondriacus, Zea mays and Helianthus annus, respectively) roots on soil aggregation of a pumiceous sandy soil (79% of sand) are reported. Thin sections were obtained from root-centered and lateral positions at four soil depths (0–28 cm) of undisturbed field samples. The three crops had the same effects on soil porosity and soil structural...
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