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National Water-Quality Assessment Program.
Agricultural land use is one of the most important influences on water quality at national regional scales. Variations follow regional patterns that are influenced by environmental setting & economics. A new approach to classifying & mapping agricultural land use for national water-quality assessment was developed by combining information on general land-use distribution with information on crop patterns from agricultural census data. Separate classification systems were developed for row crops & for orchards, vineyards, & nurseries. Includes 13 maps & 6 tables.