Data are not available for Alaska, and the Pacific Basin. Data for Puerto Rico and the U.S. Virgin Islands are shown by 6-digit hydrologic unit. NRI maps reflect national patterns rather than site- specific information. Noncultivated cropland includes permanent hayland and horticultural cropland. Land that shows evidence of being irrigated during the year of the inventory or during two or more years out of the last four years.
Water is supplied to crops by ditches, pipes, or other conduits.
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