The description for Station 2 is above the top graph. Notice the link to a suggested improvement. Click the link "Implement Improvement" to carry out the management practice "Strip Cropping". The blue curve on the Station 2 graph represents nitrogen concentration after the best management practice is implemented. Notice the fluctuation in nitrogen concentration is is much less common when the best management practice is implemented. Since two sets of data (before and after implementation of best management practice) are graphed for nitrogen concentration at Station 2, both the pre-implementation and post-implementation sets of data may be accessed through the links below the graph.
When you are finished, retract the improvement by selecting the link above the graphs. Then click on "RiverWeb Sample Questions: Exploring Station 0" above (menu frame).