Arizona State Land Department. Barr G. W. 1956. Arizona Watershed Program. Chaparral control in mosaic pattern increased streamflow and mitigated nitrate loss in Arizona. Davis, Edwin A. 1987.
Sequential treatment extend duration of nitrate loss to stream water.
Davis, Edwin A. 1984. Conversions of Arizona chaparral to grass increases water yield and nitrate loss. Davis, Edwin A. 1982. Stream water nutrient changes associated with the conversion of Arizona chaparral. USDA Forest Service General Technical Report PSW-58.