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Fig. 1. Location of the field within Iowa and the USA and the layout of tile drains, sumps, locations of high (H), medium (M), low (L), and responsive (R) N-fertilizer treatment plots and distribution of Okoboji silty clay loam, Harps loam, Ottosen clay loam and Kossuth silty clay loam soils as determined by Brevik et al. (2000).

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