Losses of nitrogen from agriculture are a major threat to environmental and human health at
local, regional and global scales. Emerging evidence shows that climate change and …

Soil enzymes, as indicators of microbial metabolism, play an important role in nutrient
biogeochemistry at the ecosystem level. In this study, we present information from a …

A tremendous amount of anthropogenic nitrogen (N) fertilizer has been applied to
agricultural lands to promote crop production in the US since the 1850s. However …

Denitrification is a process of great environmental importance but is difficult to study in
terrestrial ecosystems. Methods for quantifying the process are problematic, variability in …

Agricultural watersheds in the upper Midwest are the major source of nutrients to the
Mississippi River and Gulf of Mexico, but temporal patterns in nutrient export and the role of …

Climate change will alter both the amount and pattern of precipitation and soil water
availability, which will directly affect plant growth and nutrient acquisition, and potentially …

Much of the nonpoint N and P entering surface waters of the Midwest is from agriculture. We
determined if constructed wetlands could be used to reduce nonpoint N and P exports from …

Historical streamflow and concentration data were used in regression models to estimate the
annual flux of nitrogen (N) to the Gulf of Mexico and to determine where the nitrogen …

Current and historical data show that nitrogen concentrations and flux in the Mississippi
River Basin have increased significantly during the past 100 years. Most of the increase …

Nitrate loss from drainage tiles across the cornbelt of the upper midwestern US is a result of
intensive agriculture with limited crop diversity, extensive periods of fallow soil, and the need …