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Fig. 1. Plot design. (A) Overview of the layout in the field experiment. x = plants; gray rectangles = inner areas, traced with radionuclides and dyes; white areas = buffer area to minimize edge effects; black rectangles = instrumented trench close to the maize row (maize soil) and 50 cm from the experimental plots (vegetation-free soil); (B) sampling scheme in the inner areas.

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