Your search found 13 records
1 Bengton, R. C.; Carter, C. E.; Morris, H. F.; Bartkiewics, S. A. 1985. Effects of subsurface drainage in the lower Mississippi Valley on surface water quality. In Keyes, C. G. Jr., Ward, T. J., Development and management aspects of irrigation and drainage systems: Proceedings of the speciality conference, San Antonio, Texas. New York, NY, USA: ASCE. pp.337-344.
(Location: IWMI-HQ Call no: 631.7.8 G000 KEY Record No: H02845)
2 Thomas, J. G. 1994. Lay-flat tubing makes a run in the Delta. Irrigation Journal, 44(6):21-25.
(Location: IWMI-HQ Call no: PER Record No: H015991)
3 Knapp, H. V. 1994. Hydrologic trends in the Upper Mississippi River Basin. Water International, 19(4):199-206.
(Location: IWMI-HQ Call no: PER Record No: H016658)
(Location: IWMI-HQ Call no: PER Record No: H017883)
5 Maxwell, W. C. H.; Preul, H. C.; Stout, G. E. (Eds.) 1996. Proceedings Rivertech 96 - Volume 1: 1st International Conference on New/Emerging Concepts for Rivers, September 22 - September 26, 1996, Fairmont Hotel, Chicago, Illinois, USA. Urbana, IL, USA: IWRA. xii, 474p.
(Location: IWMI-HQ Call no: 627.12 G000 MAX Record No: H021106)
6 Maxwell, W. C. H.; Preul, H. C.; Stout, G. E. (Eds.) 1996. Proceedings Rivertech 96 - Volume 2: 1st International Conference on New/Emerging Concepts for Rivers, September 22 - September 26, 1996, Fairmont Hotel, Chicago, Illinois, USA. Urbana, IL, USA: IWRA. pp.475-931.
(Location: IWMI-HQ Call no: 627.12 G000 MAX Record No: H021108)
(Location: IWMI-HQ Call no: 551.483 G000 SCH Record No: H019251)
8 Bhowmik, N. G. 1998. River basin management: An integrated approach. Water International, 23(2):84-90.
(Location: IWMI-HQ Call no: PER Record No: H023640)
(Location: IWMI-HQ Call no: PER Record No: H024822)
10 Ballweber, J. A. 1999. A critique of watershed management efforts in the Lower Mississippi alluvial plain. Journal of the American Water Resources Association, 35(3):643-654.
(Location: IWMI-HQ Call no: PER Record No: H024839)
(Location: IWMI-HQ Call no: PER Record No: H030963)
(Location: IWMI-HQ Call no: P 7476 Record No: H038083)
(Location: IWMI HQ Call no: IWMI 631.8 G430 NAN Record No: H040829)
Nitrate losses from subsurface tile drained row cropland in the Upper Midwest U.S. contribute to hypoxia in the Gulf of Mexico. Strategies are needed to reduce nitrate losses to the Mississippi River. This paper evaluates the effect of fertilizer rate and timing on nitrate losses in two (East and West) commercial row crop fields located in south-central Minnesota. The Agricultural Drainage and Pesticide Transport (ADAPT) model was calibrated and validated for monthly subsurface tile drain flow and nitrate losses for a period of 1999–2003. Good agreement was found between observed and predicted tile drain flow and nitrate losses during the calibration period, with Nash-Sutcliff e modeling efficiencies of 0.75 and 0.56, respectively. Better agreements were observed for the validation period. The calibrated model was then used to evaluate the effects of rate and timing of fertilizer application on nitrate losses with a 50-yr climatic record (1954–2003). Significant reductions in nitrate losses were predicted by reducing fertilizer application rates and changing timing. A 13% reduction in nitrate losses was predicted when fall fertilizer application rate was reduced from 180 to 123 kg/ha. A further 9% reduction in nitrate losses can be achieved when switching from fall to spring application. Larger reductions in nitrate losses would require changes in fertilizer rate and timing, as well as other practices such as changing tile drain spacings and/or depths, fall cover cropping, or conversion of crop land to pasture.
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