To address issues of energy security and greenhouse gas (GHG) mitigation, substantial
amounts of corn-derived ethanol are used in US gasoline. Currently, ethanol comprises 10 …

The main objective of this work was to quantify and update the US Midwest agricultural state
of Iowa's contribution of nitrate-nitrogen to the Mississippi River stream network against the …

Nitrogen losses from artificially drained watersheds degrade water quality at local and
regional scales. In this study, we used an end-member mixing analysis (EMMA) together …

Various techniques exist to estimate stream nitrate loads when measured concentration data
are sparse. The inherent uncertainty associated with load estimation, however, makes …

Growth and consolidation in the livestock industry in the past 30 years have resulted in more
total farm animals being raised on fewer Iowa farms. The effects of this on stream water …

CONTEXT Yield gaps in Midwest US rainfed maize (Zea mays L.) are likely to continue to
increase as the frequency of extreme weather events associated with future climate change …

The Illinois River is a major contributor of nitrate‐N to the Mississippi River and the Gulf of
Mexico, where nitrate is a leading cause of summertime benthic hypoxia. Corn–soybean …

Accumulation of nitrogen (N) in reservoirs has negative effects, generating algal blooms,
creating hypoxic zones, and degrading drinking water quality. Agricultural land use …

Agricultural landscapes often leak inorganic nitrogen to the stream network, usually in the
form of nitrate-nitrite (NO xN), degrading downstream water quality on both the local and …

Intensive agriculture in the Upper Mississippi River Basin contributes nitrogen and
phosphorus loads to the Gulf of Mexico. Increases in nitrogen and phosphorus loads from …