Skip to main content
Water for Food Institute Logo

Research looks to control nitrate leaching, protect Nebraska groundwater

Around the world and across Nebraska, nitrogen fertilizer is regularly used to grow crops.

Some of this nitrogen is converted to nitrate that can be easily lost from the root zone, eventually contaminating ground and surface water. In addition to being harmful to human health, excess nitrate in drinking water is costly for small communities to treat. Sandy, irrigated soils in Nebraska are highly vulnerable to nitrate leaching, and few options exist for controlling nitrogen losses from these fields.

These concerns motivated Nebraska researchers to try something new on this old problem.

In 2018, the Nebraska Water Center received a grant from the Nebraska Environmental Trust to research how injecting carbon into the subsoil — by way of mulch and sawdust — could absorb and remove extra nitrate from the soil. The project is led by Dan Snow, research professor and director of the University of Nebraska’s Water Sciences Laboratory.

“This project is innovative because it provides a new, economical approach for improving groundwater quality,” Snow said.

The project’s goal is to offer a cost-effective method for producers and Nebraska’s Natural Resources Districts to reduce nitrate leaching beneath cropland in areas that are most vulnerable to groundwater contamination. In Spring 2021, Snow and collaborators injected fine-ground wood mulch below the root zone using a modified subsoil plow on two demonstration sites in northeast Nebraska’s Bazile Groundwater Management Area. They will monitor differences in nitrate leaching between treated and untreated fields for several growing seasons to measure the method’s effectiveness. The team will return this fall to collect water, soil and plant biomass samples for analysis.

Ultimately, the project seeks to demonstrate the efficacy and cost effectiveness of using an abundant carbon source to intercept and remove dissolved nitrate after it has left the root zone.

In addition to Snow, the team includes Arindam Malakar, research assistant professor, Nebraska Water Center; Amy Schmidt, assistant professor, Department of Biological Systems Engineering, University of Nebraska–Lincoln; Daniel Miller, research microbiologist, USDA Agricultural Research Service; and Xiaochen Dong, graduate student, School of Natural Resources, Nebraska.

Additional project support is provided by the Daugherty Water for Food Global Institute and Bazile Groundwater Management Area.

FY 2022 Annual Report

FY 2022 Annual Report

Tags

Research Nebraska Research Nitrate Groundwater Natural Resources

Related Articles

Heeren Inspires Students through Irrigation Field Course

A summer irrigation lab and field course led by DWFI Faculty Fellow Derek Heeren helps his students ground their class lessons through in-person farm and industry visits.

Nebraska researchers are following the water

Graduate student Caner Zeyrek and his advisor, Troy Gilmore, are learning a lot about Nebraska’s water flows.

Nebraska Water Center conference held in Scottsbluff

The Nebraska Water Center (NWC) trekked across the state to host its annual Nebraska Water Conference in 2021. 

Read all Blogs

COOKIE USAGE:

The University of Nebraska System uses cookies to give you the best online experience. By clicking "I Agree" and/or continuing to use this website without adjusting your browser settings, you accept the use of cookies.

PRIVACY SETTINGS