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Hydrological Variability and Agricultural Drainage Ditch Inorganic Nitrogen Reduction Capacity

^a Dep. of Biology, Univ. of Mississippi, University, MS 38677
^b USDA-ARS, National Sedimentation Lab., Oxford, MS 38655

View larger version (99K): [in this window] [in a new window]   Fig. 1. Study site location within the Little Tallahatchie watershed, Northern Mississippi (MARIS: http://www.maris.state.ms.us [verified 25 July 2007]). Subset is a 2002 aerial photograph of the two field sites in Lafayette County, MS. Bold lines within each farm delineate drainage ditches (aerial photograph compliments of the USDA-NRCS).

View larger version (8K): [in this window] [in a new window]   Fig. 2. Change in regression slope lines for baseflow N concentrations over the 2-yr study period. Two fertilization events occurred in June/July of 2004 and 2005; growing and dormant season periods are overlaid within the plot.