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Controlling Factors <br />• Organic matter in soils=Nitrogen reactive transport in <br />the vertical direction in vadose zone (nitrification and <br />denitrification) <br />• Nitrogen reactive transport in the horizontal direction in <br />surficial aquifer (flow through system) <br />• Denitrification in shallow soil and ground water <br />• Data needs: <br />✓ SURRGO data are of site scale, and insufficient to fully <br />understand the mechanisms controlling nitrogen reactive <br />transport. <br />✓ More local -scale data from the wells are needed . <br />v <br />"Data! Data! Data!" He cried impatiently. "I cannot make <br />bricks without clay." — Sherlock Holmes <br />