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Fig. 4. (a) Mean shallow groundwater NO₃–N concentration averaged over the 0.9- to 1.8-, 1.8- to 2.7-, and 2.7- to 3.7-m depths and (b) field-average shallow water table depth measured from July 2001 to July 2003. Bars indicate (a) ±1 or (b) +1 SE. Tile drainage lines are at $~$ 1-m depth.