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of mixed origin. Most of the soil within this association is medium, moderately fine or fine textured, and a high percentage of it is well suited to irrigation for a wide variety of crops. Subsurface layers are similar but may range in texture from sand to clay. Representative soil series of the Middle Rio Grande Valley are of Gila, Glendale or Vinton series. By contrast, soils adjacent to the viticultural area that occur on the strongly sloping uplands north of the Rio Grande plain

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