Table 3. Nitrogen inputs and export for selected basins in the lower Tennessee River Basin
[Inputs and export reported in tons per year of nitrogen; unit-area inputs and yield reported in tons per square mile per year; --, not estimated; <, less than; -, negative number because crop harvest represents a nutrient sink; balance of land-phase input is calculated as the sum of inputs from fertilizer application, nitrogen fixation, and livestock waste, minus removal as crop harvest; export was estimated for 1992 at sites where record was available for that year]
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Stream input Land-phase input
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Balance of
Wastewater Atmospheric Fertilizer Nitrogen Harvest (crop) Livestock land-phase
Site discharge deposition application fixation uptake) waste input to agri-
identi- Surface-water station (1995 or 1992) (1992) (1991) (1992) (1992) (1992) cultural land Export (1992)
fica- ______________________________ _______________ ________________ _______________ _______________ ______________ ______________ ______________ _________________
tion Unit Unit Unit Unit Unit Unit Unit
(fig. area area area area area area area
2) Number Name Input input Input input Input input Input input Input input Input input Input input Load Yield
_______________________________________________________________________________________________________________________________________________________________________________
Tributary sites
1 PRI038 Clarks River at Almo, Ky. 82 0.61 210 1.6 3,000 23 1,000 7.6 -3,300 -24 500 3.7 1,300 9.7 320 2.4
2 03604000 Buffalo River near 26 .06 800 1.8 1,600 3.6 130 .3 -1,200 -2.6 880 2.0 1,400 3.2 460 1.0
Flat Woods, Tenn.
4 001025 Duck River below Normandy 52 .27 350 1.8 890 4.5 290 1.5 -990 -5.1 990 5.1 1,200 6.1 200 1.0
Dam, Tenn.
5 001065 Duck River at Williamsport, 300 .21 2,600 1.8 5,200 3.6 1,100 .8 -6,000 -4.2 9,500 6.6 9,800 6.8 3,000 2.1
Tenn.
6 475793 Duck River above Hurricane 320 .12 4,600 1.8 6,700 2.6 1,300 .5 -8,000 -3.1 12,000 4.7 12,000 4.6 4,500 1.7
Mills, Tenn.
7 002395 Shoal Creek at Highway 43, 75 .43 320 1.8 1,200 6.6 100 .6 -850 -4.8 730 4.1 1,100 6.5 500 2.9
near Lawrenceburg, Tenn.
9 001207 Elk River below Tims Ford 93 .18 960 1.8 3,200 6.0 850 1.6 -3,200 -6.0 3,100 5.9 3,900 7.5 530 1.0
Dam, Tenn.
10 475796 Elk River near Prospect, 160 .092 3,200 1.8 7,600 4.3 1,700 1.0 -7,800 -4.4 11,000 5.9 12,000 6.7 5,300 3.0
Tenn.
11 FLCR7 Flint Creek near Falkville, 0 .00 160 1.9 180 2.1 34 .4 -150 -1.8 1,100 12 1,100 13 a200 a2.4
Ala.
12 TOWNCREEK15 Town Creek near Geraldine, 0.55 <.01 310 2.0 730 4.7 96 .6 -490 -3.1 2,000 13 2,400 15 550 3.5
Ala.
13 002375 Sequatchie River at Valley 13 .02 1,000 1.8 860 1.5 200 .3 -960 -1.7 1,300 2.2 1,400 2.4 820 1.4
Road, Tenn.
Main stem sites
14 03609750 Tennessee River at Highway 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- b56,000 b1.4
near Paducah, Ky.
15 202832 Tennessee River at mile 23, -- -- -- -- -- -- -- -- -- -- -- -- -- -- 38,000 0.94
Ky.
16 03593005 Tennessee River at Pickwick -- -- -- -- -- -- -- -- -- -- -- -- -- -- 36,000 1.1
Landing Dam, Tenn.
17 03571850 Tennessee River at South -- -- -- -- -- -- -- -- -- -- -- -- -- -- b43,000 b1.9
Pittsburg, Tenn.
18 003315 Tennessee River below Raccoon -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20,000 0.94
Mountain, Tenn.
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a Estimate for 1994.
b Estimate for 1982.
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