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Dissolved Nutrient Losses in Storm Runoff from Five Southern Pine Watersheds¹

ABSTRACT

Storm runoff from five reforested eroded watersheds in northern Mississippi (1.5 to 2.8 ha) was analyzed during the 1973 water year to determine the concentrations of soluble NO₃-N, NH₄-N, PO₄-P, Ca, Mg, and K. Storm runoff was measured with 0.91-m H-flumes and samples collected with a Coshocton wheel sampler. Analysis of precipitation which totaled 189 cm for the year, 40% above average, revealed that inputs of NO₃-N, NH₄-N, PO₄-P, Ca, Mg, and K for the year were 3.12, 5.73, 0.07, 7.72, 3.03, and 4.98 kg/ha, respectively. Soluble nutrient losses in the storm runoff on a unit area basis were similar for the five watersheds. Average losses in storm runoff of soluble NO₃-N, NH₄-N, PO₄-P, Ca, Mg, and K for the year were 0.32, 3.35, 0.04, 6.21, 3.05, and 3.31 kg/ha, respectively. As the annual storm runoff among the watersheds increased, the NO₃-N losses also increased linearly. Data for individual storms indicated that a critical storm runoff value must be exceeded before the watersheds would exhibit a net loss of each nutrient.

Key Words: nutrient net gain or loss • water quality • cycling nutrients • chemistry of precipitation • nutrient flux • baseline studies • nitrogen • phosphorus • cations

¹ Contribution from the USDA Sedimentation Laboratory, Agric. Res. Serv., and USDA Forest Service Hydrology Laboratory, Oxford, MS 38655.

² Soil Scientist, USDA Sediment. Lab., Associate Soil Scientist, and Principal Soil Scientist, USDA Hydrol. Lab., respectively.

Received for publication April 29, 1975.

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