Table 4. Phosphorus inputs and export, and ratio of nitrogen to phosphorus export, for selected basins in the lower Tennessee River Basin
[Inputs and export reported in tons per year of phosphorus; unit-area inputs and yield reported in tons per square mile per year; --, not estimated; -, negative number because crop harvest represents a nutrient sink; balance of land-phase input calculated as the sum of inputs from fertilizer application 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- Ratio
identi- Surface-water station (1995 or 1992) (1992) (1991) (1992) (1992) (1992) cultural land Export (1992) of
fica- ______________________________ _______________ ________________ _______________ _______________ ______________ ______________ ______________ _________________ nitro-
tion Unit Unit Unit Unit Unit Unit Unit gen to
(fig. area area area area area area area phosphorus
2) Number Name Input input Input input Input input Input input Input input Input input Input input Load Yield export
________________________________________________________________________________________________________________________________________________________________________________________
Tributary sites
1 PRI038 Clarks River at Almo, Ky. 19 0.14 -- -- 690 5.1 -- -- -430 -3.2 170 1.2 430 3.2 40 0.30 8:1
2 03604000 Buffalo River near 6 .014 -- -- 410 .93 -- -- -140 -.32 280 .62 550 1.2 20 .044 23:1
Flat Woods, Tenn.
4 001025 Duck River below Normandy 10 .050 -- -- 230 1.2 -- -- -120 -.60 280 1.4 390 2.0 16 .082 12:1
Dam, Tenn.
5 001065 Duck River at Williamsport, 67 .046 -- -- 1,300 .92 -- -- -700 -.48 2,700 1.9 3,300 2.3 1,300 .93 2:1
Tenn.
6 475793 Duck River above Hurricane 71 .028 -- -- 1,700 .67 -- -- -930 -.36 3,500 1.4 4,200 1.7 2,900 1.1 2:1
Mills, Tenn.
7 002395 Shoal Creek at Highway 43, 13 .072 -- -- 300 1.7 -- -- -100 -.61 220 1.2 400 2.3 26 .15 19:1
near Lawrenceburg, Tenn.
9 001207 Elk River below Tims Ford 22 .042 -- -- 820 1.5 -- -- -400 -.76 980 1.8 1,400 2.6 18 .034 29:1
Dam, Tenn.
10 475796 Elk River near Prospect, 39 .022 -- -- 1,900 1.1 -- -- -950 -.53 3,100 1.7 4,100 2.3 1,600 .89 3:1
Tenn.
11 FLCR7 Flint Creek near Falkville, 0 .00 -- -- 30 .35 -- -- -17 -.19 320 3.7 340 3.9 -- --
Ala.
12 TOWNCREEK15 Town Creek near 0.15 .001 -- -- 120 .77 -- -- -61 -.39 680 4.3 740 4.7 -- --
Geraldine, Ala.
13 002375 Sequatchie River at Valley 3 .005 -- -- 220 .38 -- -- -110 -.19 390 .68 500 .87 -- --
Road, Tenn.
Main stem sites
14 03609750 Tennessee River at Highway 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
near Paducah, Ky.
15 202832 Tennessee River at mile 23, -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3,200 .08 12:1
Ky.
16 03593005 Tennessee River at Pickwick -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3,900 .12 9:1
Landing Dam, Tenn.
17 03571850 Tennessee River at South -- -- -- -- -- -- -- -- -- -- -- -- -- -- a1,600 a.07 27:1
Pittsburg, Tenn.
18 003315 Tennessee River below Raccoon -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Mountain, Tenn.
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a Instream estimate for 1982.
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