D R Lapen

Long-Term Observations of Nitrogen and Phosphorus Export in Paired-Agricultural Watersheds under Controlled and Conventional Tile Drainage.

E Topp, S. Frey, E. Topp, 2015, Journal of environmental quality.

Using weather indices to predict survival of winter wheat in a cool temperate environment

D R Lapen, H N Hayhoe, C J Andrews, 2003, International journal of biometeorology.

Effect of liquid municipal biosolid application method on tile and ground water quality.

E Topp, E. Topp, D. Lapen, 2008, Journal of environmental quality.

Comprehensive nitrogen budgets for controlled tile drainage fields in eastern ontario, Canada.

E Topp, C. Drury, E. Topp, 2014, Journal of environmental quality.