Precipitation Nitrogen Contribution Relative to Surface Runoff Discharges1
- G. E. Schuman and
- R. E. Burwell2
Ammonia and nitrate concentrations in precipitation and surface runoff from two adjacent watersheds, fertilized at 168 and 448 kg N/ha, respectively, were studied to determine the relative contribution of precipitation N in relation to surface runoff N discharge. The data show that 69% of the N discharged by surface runoff from the sampled events could be accounted for by precipitation-originated N on the watershed fertilized at 168 kg N/ha, whereas 53% of the N discharged from the watershed fertilized at 448 kg N/ha could be attributed to N originating in the precipitation. However, the data indicate that, on an annual basis, the surface runoff N discharge accounts for only 20% of that in the total incoming precipitation. This difference can be accounted for by precipitation intensity or duration that did not cause runoff, absorption of NH4-N by the soil material, or leaching of NO3-N into the soil profile.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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