Ground-water quality beneath irrigated cropland of the northern and southern High Plains aquifer, Nebraska and Texas, 2003-04

• DOI: 10.3133/sir20065196
• Publication Date: 2018-08-15T19:07:46Z
• Authors: Jennifer S. Stanton; Lynne S. Fahlquist
• Keywords: Alachlor; Maximum Contaminant Level

A study of the quality ground water beneath irrigated cropland was completed for northern and southern High Plains aquifer. Ground-water samples were collected from 30 water-table monitoring wells in agricultural land-use (NAL) area Nebraska 2004 29 (SAL) Texas 2003. The two areas represented different hydrogeologic settings. primary crops grown NAL corn soybeans, crop SAL cotton. Overall, pesticide fertilizer application rates larger area. Also, precipitation recharge greater area, depths to evapotranspiration area.Ground-water areas. Nitrate concentrations detections more frequent ranged 1.96 106 mg/L (milligrams per liter) as nitrogen, with a median concentration 10.6 mg/L. Water 73 percent had at least one or degradate detected. Most compounds detected (atrazine, alachlor, metolachlor, simazine, degradates those pesticides) are applied soybean fields. 0.96 21.6 mg/L, 4.12 24 deethylatrazine (a atrazine propazine), propazine, fluometuron, tebuthiuron. pesticides cotton fields.Dissolved-solids positively correlated both nitrate chloride concentrations, suggesting combination human natural sources. Dissolved-solids 272 2,160 442 dissolved solids 416 3,580 814