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- W1976958037 abstract "Abstract The export and concentration of inorganic nitrogen and total phosphorus from 34 watersheds in a northwestern Iowa lake district were measured during March 1971–August 1973. Annual nutrient losses were approximately 0.35 kg ha−1 P. 6.7 kg ha−1 NO3-N, and 1.0 kg ha−1 NH3-N. A statistical analysis of the relationship between land-use and plant nutrients was used to determine differences among streams. Animal units in feedlots were significantly correlated with phosphorus and ammonia nitrogen (mg l−1 and kg ha−1 yr−1). Nitrate nitrogen was negatively correlated with the percentage of watershed in marshland. Tile drainage and surface runoff from grasslands, feedlots, cornfields, and soybean fields were analyzed for nitrogen and phosphorus in spring 1974: mean values are given." @default.
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- W1976958037 date "1976-01-01" @default.
- W1976958037 modified "2023-09-27" @default.
- W1976958037 title "Factors affecting nutrient loads in some Iowa streams" @default.
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- W1976958037 doi "https://doi.org/10.1016/0043-1354(76)90109-3" @default.
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