Spatial variability of bromide and atrazine transport parameters for a Udipsamment

摘要: Abstract Variability of soil properties can have major influence on the results solute transport models when applied to field conducted experiments. The objective this study was determine spatial variability and degradation parameters for a bromide tracer atrazine herbicide in 0.1 ha alluvial soils under no-till management. investigated Sarpy (mixed, mesic Typic Udipsamment) with surface texture varying from sand loam. classified into three areas (Area I, sand; Area II, sandy loam; III, loam) according texture. Atrazine were at rates 1.8 kg ha− 1 115 kg ha− 1, respectively. Soil cores extracted selected dates, segmented 75 mm increments, analyzed each chemical separately. physical determined as function depth additional removed completed. value average pore water velocity, v, estimated using concentrations 6.0 mm day− 1 which about 29% lower than computed meteorological information, 8.5 mm day− 1. dispersion coefficient (D), 508 mm2 day− 1, 80 times higher that atrazine, 6.13 mm2 v D found be spatially autocorrelated ranges between 20 23 m 12 24 m, retardation structure only one sampling date range 18 24 m. textural first depths (0–45 cm) five monitored (0–75 cm). This autocorrelation within 20 m few an site.