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    Author(s): M. A. Tabatabai; J. M. Laflen
    Date: 1976
    Source: In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 293-308
    Publication Series: General Technical Report (GTR)
    Station: Northeastern Research Station
    PDF: View PDF  (661.1 KB)

    Description

    Nutrient content and pH of precipitation samples collected at six sites during 1971-1973 were studied to determine the reaction of rainfall and snowmelt and the amounts of N, S, and P added by precipitation over Iowa. The amount of NH4-N added by precipitation per hectare annually at each site was about equal to that added as NO3-N. The amounts of inorganic N added per hectare per year ranged from 10 kg in north-central to 14 kg in west-central Iowa, and the annual amounts of SO4-S added per hectare ranged from 13 kg in northeastern to 17 kg in north-central Iowa. It is estimated that, on average precipitation adds about 0.6 kg of NH4-N, 0.6 kg of NO3-N, and 1.5 kg of SO4-S per hectare monthly in Iowa. However, the data indicated that, on an annual basis, the contribution of precipitation to P in soil is very small; at the most, about 0.1 kg of water-soluble PO4-P was added per hectare annually in Iowa. No NO2-N could be detected in any of the precipitation samples analyzed. Average pH value of the rainfall and snowmelt samples collected at each site during each year was about 6, individual samples seldom reached as low as pH 4. The data indicate that the concentration of SO4-S in precipitation in this region is seasonal, high during fall and winter and low during spring and summer.

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    Citation

    Tabatabai, M. A.; Laflen, J. M. 1976. Nutrient content of precipitation over Iowa. In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 293-308

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