Total amount of irrigated cropland may be small. NRI maps reflect national patterns rather than site- specific information. For example, a valve is used to reduce pressurized water delivered to a farm or field for subsequent distribution by a gravity surface irrigation system. Sub- surface irrigation pipelines or ditches. 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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