Spatiotemporal variations of hydrochemical characteristics of irrigation water: a case study of the Lower Rio Grande Valley, USA

Abstract Hydrochemical characteristics of irrigation water and their spatiotemporal variations can provide critical information for ensuring healthy crop growth determining the best management practices. The Lower Rio Grande Valley (LRGV) is heavily dependent upon ditch to deliver from River support its staple production. To date, no studies have been conducted quantify quality along distribution system. This research measured parameters at seven sites in LRGV 2021. Chemical indices including salinity hazard (SH), sodium adsorption ratio (SAR), percentage (Na%), residual carbonate (RSC), magnesium (MH), Kelly's Ratio (KR), permeability index (PI) were calculated. Classification diagrams prepared. Results revealed locations that had doubtful use more problematic levels. June August highest levels, which may attributable large rainfall events May July. SH, Na%, KR, MH exceeded recommended ANOVA analyses showed significant temporal SAR, RSC, MH, PI. These findings indicate importance incorporating variation routine planning management.