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Nitrate Loss in Subsurface Drainage as Affected by Nitrogen Fertilizer Rate

USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (31K): [in a new window]   Fig. 1. Schematic of the field showing layout of tile drains, sumps, locations of high (H), medium (M), and low (L) nitrogen fertilizer treatment plots, and distribution of Okoboji silty clay loam, Harps loam, Ottosen clay loam, and Kossuth silty clay loam soils as determined by Brevik et al. (2001).

View larger version (24K): [in a new window]   Fig. 2. Daily and annual cumulative precipitation for years 1996 through 1999.

View larger version (22K): [in a new window]   Fig. 3. Example of water discharge rate and cumulative discharge depth from a tile drain for one of the medium (M) nitrogen fertilizer treatment plots for 1996 to 1999.

View larger version (23K): [in a new window]   Fig. 4. Nitrate concentrations in tile drains averaged by month and N fertilizer treatment versus time from 1996 through 1999.

View larger version (38K): [in a new window]   Fig. 5. Observed and modeled differences between mean NO3 concentrations in tile drainage from plots receiving high (H), medium, (M), and low (L) nitrogen fertilizer treatments starting in spring 1996. Shaded area represents the 95% confidence limits of the modeled NO3 differences.

View larger version (28K): [in a new window]   Fig. 6. Average grain yield and flow-weighted concentration of NO3 in tile drains for 1996 through 1999. Yield bars followed by same letter within a year are not significantly different (P = 0.05).