Bar graph shows No drainage control vs. controlled drainage Nitrogen Transport in pounds/acre for undeveloped, surface drainage, and subsurface drainage.

Figure 6. Average annual nitrogen tranaport (TICN and NO3 N) in drainage outflow as measureci at the field edge for 14 soils and sites.

Bar graph shows No drainage control vs. controlled drainage Nitrogen Transport in pounds/acre for undeveloped, surface drainage, and subsurface drainage.