HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

Help viewing high resolution images Return to article

Fig. 3. Nitrate-N concentrations vs. (a) ¹⁵N and (b) ¹⁸O of NO₃^– for Mississippi River and tile drain samples. Letters indicate sample locations (D = Davenport, Q = Quincy, C = Chester). The gray hexagon represents the average composition of the four river samples collected in April 2004 at Quincy. The month of sample collection is shown for tile samples. Lines are linear regressions for river samples (r² = 0.64 for ¹⁵N and 0.61 ¹⁸O).

Return to article