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Bromide and Atrazine Leaching in Furrow- and Sprinkler-Irrigated Corn

^a Dep. of Soil and Crop Sciences, Colorado State Univ., Ft. Collins, CO 80523 USA
^b Central Great Plains Research Unit, USDA-ARS, Akron, CO 80720 USA
^c Great Plains Systems Research Unit, USDA-ARS, Ft. Collins, CO 80522 USA

View larger version (44K): [in a new window]   Fig. 1 Water balance and timing of experimental activities in the 1995 and 1996 growing seasons

View larger version (31K): [in a new window]   Fig. 2a Bromide mass/area as a function of sampling position for each irrigation treatment from the July 1995 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (31K): [in a new window]   Fig. 2b Bromide mass/area as a function of sampling position for each irrigation treatment from the October 1995 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (29K): [in a new window]   Fig. 2c Bromide mass/area as a function of sampling position for each irrigation treatment from the July 1996 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (29K): [in a new window]   Fig. 2d Bromide mass/area as a function of sampling position for each irrigation treatment from the October 1996 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (41K): [in a new window]   Plate 1a Spatial distribution of Br- at the end of the second growing season (15 Oct. 1996) with every-furrow placement of water. The maximum observed Br- concentration was 391 g m-3 (ridge position, +0.05 to +0.10 m). The contouring is idealized (based on 7 by 26 array of measured points interpolated to a 10 by 50 grid)

View larger version (42K): [in a new window]   Plate 1b Spatial distribution of Br- at the end of the second growing season (10 Oct. 1996) with alternate-furrow placement of water. Irrigated furrows are indicated by cross-hatching in the furrow. The maximum observed Br- concentration was 186 g m-3 (ridge position, +0.05 to +0.10 m). The contouring is idealized (based on 7 by 26 array of measured points interpolated to a 10 by 50 grid)

View larger version (31K): [in a new window]   Fig. 3a Atrazine mass/area as a function of sampling position for each irrigation treatment from the July 1995 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (30K): [in a new window]   Fig. 3b Atrazine mass /area as a function of sampling position for each irrigation treatment from the October 1995 sampling (see Table 3). The profiles are the average of n like positions within the treatment

View larger version (26K): [in a new window]   Fig. 4 Model adjusted representation of the plot average Br- concentration profile at mid (25 July 1995) and late (10 Oct. 1995) first growing season with alternate-furrow irrigation placement

View larger version (46K): [in a new window]   Plate 2 Model prediction of two-dimensional Br- distribution at the end of the second growing season (10 Oct. 1996) with alternate-furrow irrigation. Contouring is based on predicted concentration at 51 by 51 points

View larger version (24K): [in a new window]   Fig. 5a Model prediction of the plot average Br- concentration profile at mid (23 July 1996) and late (10 Oct. 1996) second growing season with alternate-furrow irrigation

View larger version (24K): [in a new window]   Fig. 5b Model prediction of the plot average Br- concentration profile at mid (24 July 1996) and late (15 Oct. 1996) second growing season with every-furrow irrigation

View larger version (25K): [in a new window]   Fig. 5c Model prediction of the plot average Br- concentration profile at mid (24 July 1996) and late (18 Oct. 1996) second growing season with sprinkler irrigation