Developing New Nitrogen Recommendations and Understanding of Water Quality Implications under Irrigated Agriculture
Dakota County Water Resources Department- Jill V. Trescott, (952) 891-7019
This project will provide a better understanding of nitrogen fertilizer management on a local level and the associated groundwater quality impacts.
- Assess nitrogen loss resulting from different nitrogen fertilizer application rates, application timing and application methods on sandy soils
- Help the University of Minnesota revise nitrogen fertilizer recommendations for irrigated coarse-textured (sandy) soils
- Establish the Dakota County Project as an educational hub for local producers, agricultural dealers and crop consultants
This project is supported through a unique partnership between Dakota County Water Resources Department, the University of Minnesota, the University of Minnesota-Extension and the Minnesota Department of Agriculture. This project will provide information to area producers and dealerships about Best Management Practices (BMPs), new fertilizer recommendations and emerging fertilizer technology.
The experimental design will parallel research at the Herman Rosholt Farm in Westport, Minnesota
MDA has developed a Joint Powers Agreement with the Dakota County Water Resources Department; Dakota County is responsible for overall project coordination.
About the Issue
This site will feature twelve nitrogen fertilizer rates ranging from 0-280 lb/N/A (pounds of nitrogen per acre). Of the 12 nitrogen rates, four will involve the delayed release nitrogen products ESN and Super Urea. The plot design will be very similar to on-going research by the University of Minnesota Extension on coarse-textured soils in Westport, Minnesota. Collectively, these sites will provide significant input into the upcoming revised nitrogen fertilizer recommendations on coarse-textured soils. This experiment will focus on a corn following corn rotation.
Deep N-nitrate soil testing (0-48") was conducted on the plots in the fall of 2011 after corn harvest. Suction tube lysimeters were installed in eight of the twelve N rate treatments in 2012 and will collect water that escapes below the root zone. Water samples will be analyzed for nitrate-nitrogen.
A climatic weather station capable of measuring minimum and maximum daily temperatures, wind speed, relative humidity, rainfall and other measurements will be installed at the site.
The University of Minnesota will be responsible for in-season plant monitoring and basal stalk testing throughout the growing season. MDA has purchased chlorophyll meters which will provide real-time feedback on plant health and nitrogen requirements.
Project Details by Fiscal Year
Competitive Grant Making Body