Table 5. Nitrogen inputs for major hydrologic units in the lower Tennessee River Basin
[Inputs reported in tons per year of nitrogen; unit-area inputs reported in tons per square mile per year; -, 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]
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Stream input Land-phase input
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Balance of
Wastewater Atmospheric Fertilizer Nitrogen Harvest (crop) Livestock land-phase
discharge deposition application fixation uptake) waste input to agri-
Major hydrologic unit (1995 or 1992) (1992) (1991) (1992) (1992) (1992) cultural land
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Hydrologic Unit Unit Unit Unit Unit Unit Unit
unit area area area area area area area
code Name Input input Input input Input input Input input Input input Input input Input input
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06020001 Area contributing to 34 0.073 880 1.9 540 1.1 68 0.14 -440 -0.94 1,300 2.7 1,500 3.1
Nickajack Reservoir
06020004 Sequatchie River basin 13 .021 1,100 1.8 860 1.5 200 .34 -970 -1.6 1,300 2.2 1,400 2.3
06030001 Area contributing to 330 .16 3,900 2.0 6,400 3.2 1,900 .93 -5,900 -2.9 14,000 7.0 16,000 8.2
Guntersville Reservoir
06030002 Area contributing to 7,400 2.5 5,500 1.9 16,000 5.6 3,500 1.2 -10,500 -3.6 13,000 4.6 22,000 7.7
Wheeler Reservoir
06030003 Upper Elk River basin 130 .10 2,300 1.8 6,000 4.6 1,500 1.2 -6,100 -4.8 7,700 6.0 9,000 7.0
06030004 Lower Elk River basin 36 .038 1,800 1.8 3,000 3.1 410 .43 -2,500 -2.6 4,500 4.7 5,400 5.6
06030005 Area contributing to 930 .41 4,100 1.8 10,000 4.5 1,000 .44 -4,800 -2.1 6,900 3.0 13,000 5.9
Pickwick/Wilson Reservoir
06030006 Bear Creek basin 39 .042 1,700 1.8 1,300 1.4 220 .23 -790 -.83 3,500 3.7 4,200 4.5
06040001 Area contributing to upper 72 .035 3,300 1.6 3,700 1.8 960 .46 -3,700 -1.7 3,700 1.8 4,700 2.3
Kentucky Reservoir
06040002 Upper Duck River basin 190 .16 2,100 1.8 4,400 3.7 920 .78 -5,000 -4.2 8,000 6.8 8,300 7.0
06040003 Lower Duck River basin 130 .088 2,600 1.7 2,500 1.6 450 .30 -3,300 -2.2 4,300 2.8 3,900 2.6
06040004 Buffalo River basin 37 .049 1,300 1.7 1,900 2.5 180 .24 -1,600 -2.1 1,200 1.6 1,700 2.3
06040005 Area contributing to lower 290 .16 2,900 1.6 3,500 1.9 1,000 .55 -3,900 -2.1 2,800 1.5 3,400 1.8
Kentucky Reservoir
06040006 Area contributing to 3,800 5.5 1,100 1.6 7,300 10 2,800 4.0 -8,500 -12 2,500 3.6 4,100 5.9
below Kentucky Dam
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