▶ What You Can and Can’t Learn from a Nitrogen Response Curve
Dr. Matt Ruark, UW–Madison soil and nutrient cycling extension specialist, dives into the value and limitations of nitrogen response curves in on-farm research.
Soils, Nutrient Management & Soil Health
Extension specialists and educators provide timely resources and information to help Wisconsin crop producers and their agricultural consultants manage crops efficiently and profitably.
Articles
▶ Tools for Planning and Spreading Manure
Hava Blair walks through using two powerful tools for planning and managing manure applications in Wisconsin: SnapPlus Version 3 and the Runoff Risk Advisory Forecast.
▶ Implications of Dairy Manure on Soil Hydrology and Organic Matter
Dr. Francisco Arriaga explores how manure affects soil hydrology, phosphorus runoff, and organic matter levels.
▶ Manure Management, Spill Response, and Safety
Kevin Erb covers trends in manure application, transportation risks, dragline safety, spill containment procedures, and regulatory requirements.
▶ Nitrogen Optimization Pilot Program 2025 Updates
Lindsey Rushford, nitrogen optimization program outreach specialist with UW–Madison Extension, provides updates on the Nitrogen Optimization Pilot Program (NOPP) for 2025.
▶ Evaluating MRTN Rates for Corn Grain and Silage After Manure Application
Jerry Clark, regional crops educator, presents findings from the first year of a statewide research project evaluating Maximum Return to Nitrogen (MRTN) rates for corn grain and silage following manure application.
▶ How Does Nitrate Leaching Respond to Nitrogen Inputs from Fertilizer and Manure?
Dr. Steven Hall, assistant professor and extension cropping systems and water quality specialist, explores how nitrate leaching responds to nitrogen inputs from both synthetic fertilizer and manure in Wisconsin cropping systems.
Approaches to Estimating Manure Nitrogen Credits
This article provides insight into various approaches to calculate and verify manure-nitrogen availability (N credits). We explore: 1) approaches used to calculate plant available N (PAN) from manure that can be used for planning N applications; 2) research methods used to develop “book values” or availability coefficients; 3) soil test indices that might help farmers determine manure N availability from a specific manure application.
Incorporating Off Farm Wastes in Nutrient Management Planning
Summary Limiting Nutrient for Material Application Application restrictions near wells and/or buildings Application restrictions based on depth to ground water and bedrock Application restrictions near surface water Winter (frozen or snow covered ground) spreading restrictions Use of wood ash to adjust soil pH SnapPlus V3 Help and Reference Websites Contributors and Reviewers A Summary of […]
Soil Health Lab, Sampling, and Test Selection Considerations
This article provides guidance related to the importance of using the same lab to assess changes in soil health over time, in addition to the importance of sampling at a consistent time of year and depth when collecting samples for soil health evaluation.
▶ Swheat: Finding the Right Sulfur Rate on Wheat
In this video, Scott Reuss, regional crops educator, UW–Madison Extension, presents findings from multi-year research trials investigating optimal sulfur application rates for winter wheat in northeastern Wisconsin.
▶ Handling, Storage, and Nutrient Removal: Integrated Approaches to Small Grain Management
In this video, Dan H. Smith explores practical tips for calculating seed needs, managing storage conditions, and evaluating the economic value of straw and nutrient exports.
