M. Lewis

The changing trend in nitrate concentrations in major aquifers due to historical nitrate loading from agricultural land across England and Wales from 1925 to 2150.

P. Naden, A. Collins, L. Wang, 2016, The Science of the total environment.

Soil nitrogen and phosphorus were greater in overlapping areas of fields in Alberta, Saskatchewan, Manitoba, and Ontario

S. Crittenden, K. Reid, B. Irvine, 2020, Canadian Journal of Soil Science.