The Minnesota Department of Agriculture (MDA) partnered with the East Otter Tail Soil and Water Conservation District (EOT SWCD) to carry out a series of irrigation workshops and programs to promote proper water and nitrogen fertilizer management. While the workshops have ended the information gained provides a foundation for continued nitrogen management work. Existing and new tools continue to evolve to assist Minnesota irrigators.
Local crop water use information is available from 12 weather stations. This network has grown in response to the needs of irrigating producers in this region. The daily crop water use data provided by these stations is critical for growers to efficiently schedule their irrigation water applications. View additional program information, a map of sites and a link to the weather network.
An online irrigation scheduling tool is now available to seven counties in Central MN. The tool provides irrigation scheduling recommendations based on information provided by the ag weather network and individual users. Data used includes evapotranspiration information, field specific soils information, weather service rainfall data, and user defined crop and irrigation system details. Using this information the tool creates recommendations that reflect what is going on in the individual field. The tool is easy-to-use and accessible on mobile devices. Visit the Irrigation Management Assistant webpage to sign-up.
East Otter Tail SWCD offers one-on-one training and works with individual farmers to schedule proper irrigation management. To learn more about one-on-one training, please contact the East Otter Tail SWCD at 218-346-4260 extension 3.
Ensuring that Minnesota irrigators have the proper technical tools and training is critical to the long-term protection of groundwater resources.
The MDA and EOT SWCD developed curriculum and hosted the first workshop in 2011 (New York Mills, MN). The hands-on program engaged participants and addressed the combined topics of nitrogen and fertilizer management. The workshop was well received and emphasized a need for more. To meet this need, three central Minnesota workshops were held in both 2012 and 2013. In 2014-2018, one larger workshop was held. The presentations were split between irrigation and nitrogen management.
Workshops included speakers from the MDA, NRCS, local SWCDs, the University of Minnesota Extension, and irrigation industry representatives. Topics covered included:
Workshop summaries and resources are available upon request. Please see MDA Contact information below.
Partners also supported an on-farm nitrogen management program to encourage producers to:
The program was based on the corn Basal Stalk Nitrate Test (BSNT). The test was used to determine how much nitrogen was leftover at the end of the growing season.
Stalk samples were taken when the corn crop was showing stress. Aerial images, taken by plane, were used to determine this timing. Sampling typically occurred during mid-to-late August. Each producer enrolled in the program received a copy of the imagery, the stalk sample results from their field, and an annual program summary. The summary included data from all program participants. Participants were invited to a follow-up meeting in the winter to review data and discuss possible management changes that could improve the efficiency of nitrogen use in their field.
The Minnesota Department of Agriculture water monitoring data indicates that high groundwater nitrate-nitrogen levels exist in central Minnesota and that nitrate levels have steadily increased in this region over the past two decades. The sandy soils in this area are a major factor contributing to the elevated groundwater nitrate levels. Proper irrigation water and nitrogen management are critical where vulnerable groundwater aquifers are prevalent.
The information shared through this program provided Minnesota irrigators with the knowledge, tools and technology to make informed decisions to minimize negative environmental impacts while increasing profitability. The MDA will continue to work with irrigators to prevent groundwater contamination under the guidance of the Nitrogen Fertilizer Management Plan.
Impaired Waters Technical Advisor
Luke.Stuewe@state.mn.us ~ 218-846-7425