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Controlling Nitrate Leaching in Irrigated Agriculture

^a Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0844
^b Dep. of Biological Systems Eng., Univ. of Nebraska, Lincoln, NE 68583-0726
^c Dep. of Agronomy USDA-ARS, Univ. of Nebraska, Lincoln, NE 68583-0934
^d Water Sciences Lab., Univ. of Nebraska, Lincoln, NE 68583-0844
^e School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE 68583-0759
^f Dep. of Earth and Environ. Sciences, Univ. of Rochester, Rochester, NY 14627

View larger version (15K): [in a new window]   Fig. 1. Location of Central Platte Natural Resources District (NRD), shallow ground water nonpoint NO3–N plume, and the Nebraska Management Systems Evaluation Area (NE-MSEA) research/demonstration site.

View larger version (42K): [in a new window]   Fig. 2. Layout of research/demonstration site and sampling locations.

View larger version (34K): [in a new window]   Fig. 3. Multilevel sampler construction.

View larger version (26K): [in a new window]   Fig. 4. Ground water age, 3H, and 3H + 3He profiles in April 1993 from three piezometer clusters.

View larger version (25K): [in a new window]   Fig. 5. Vertical profiles of ground water NO3–N concentrations, fall 1991–1996, with regression line for NO3–N concentration vs. depth below land surface in the mixing zone and 1993 ground water ages.

View larger version (44K): [in a new window]   Fig. 6. Seasonal plots of average pore-water and shallow ground water NO3–N concentrations and depth to water with inset plots of the regression line of the seasonal average shallow ground water NO3–N concentrations vs. depth to the water table at the (a) furrow-irrigated and (b) pivot-irrigated management fields. Levels of statistical significance of r values are as follows: ns = not significant, * = significant at 5% level, and *** = significant at 0.1% level.

View larger version (39K): [in a new window]   Fig. 7. Recommended N fertilizer application and N inputs from fertilizer and irrigation water for corn management fields. Recommended N for an expected yield of 12.6 Mg ha-1 is based upon 2% soil organic matter and residual NO3–N in the upper 0.9 m of the root zone.