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High water table <br />results in elevated <br />ammonia <br />concentrations <br />0.5 <br />0.45 <br />M <br />,_, 0.35 <br />J <br />t� <br />0.3 <br />z <br />0.25 <br />E 0.2 <br />E <br />`t 0.15 <br />[flu <br />0 1 2 3 4 5 6 <br />--P— Groundwater Level (10/2015) (m) <br />DenitriGi anon <br />Soil Treatment N0; ;4,N.(g). <br />y . <br />Unit (STU.) <br />Ammonia <br />volatilization <br />NH,' NH,(g) <br />Plant Nitrogen <br />Recylcing <br />Plant, Nitrogen <br />Uptake Aminonification•, <br />wIaAtirati�:e,Su aced Organic N—+ NH,' <br />Nitrification and Soil Sorption <br />INH;—NO, NH,` <br />:v } `Y r <br />Den'triricatioji <br />NO; NA) <br />When water table is high, <br />nitrification process is <br />incomplete, and ammonia <br />concentration is high at the <br />water table. <br />Land surface elevation is about <br />6m. <br />