Advancing 4R Nutrient Stewardship Across Delaware & Maryland
A Collaborative Approach to Farming & Conservation in Delaware and Maryland
Founded in 2015 by The Nature Conservancy and the Delaware-Maryland Agribusiness Association, the Delaware-Maryland 4R Alliance (formerly the Chesapeake 4R Alliance) works to increase the adoption of nutrient stewardship practices across Delaware and Maryland farms.
Our Mission:
Help farmers apply nutrients efficiently and responsibly while supporting long-term farm productivity and water quality in the Chesapeake Bay region.
Recognizing the People Who Make DEMD4R Work
Practical Solutions for Delaware & Maryland Farmers
The Alliance focuses on:
- Increasing productivity and profitability for Delaware and Maryland farms.
- Hosting 4R workshops and field days to connect farmers and advisors.
- Supporting on-farm demonstrations for variable-rate nitrogen management and nutrient modeling.
- Building partnerships through conservation programs like RCPP, CSP, EQIP, and WRE.
Turning 4R Principles Into Regional Results
Since 2015, the Delaware-Maryland 4R Alliance has:
- Helped farmers manage thousands of acres with conservation practices.
- Launched on-farm demos showing the benefits of precision nutrient management.
- Connected agribusinesses, conservation partners, and farmers through hands-on training events.
Every acre managed with the 4Rs benefits farmers, waterways, and the entire Chesapeake Bay region.
Join the 4R Movement in Delaware & Maryland
Download our handouts on 4R Practices
Learn more about the benefits of membership
Press and News
Voucher Program
The Mid-Atlantic 4R Nutrient Stewardship Association has received funding from the Campbell Foundation and our 2024 National Fish and Wildlife Foundation Innovative Nutrient and Sediment Reduction grant to...
Cost Share
The Mid-Atlantic 4R Nutrient Stewardship Association is looking for producers who are interested in enhancing their 4R nutrient stewardship by adding an additional split to their nitrogen application or test a biofertilizer or biostimulant for the 2024 corn growing...
Mid-Atlantic 4R Science Symposium
Join us Monday, January 26, 2026 in Lancaster, PA Chester, Maryland (January 16, 2026) – The Mid-Atlantic 4R Nutrient Stewardship Association is inviting you to our annual 4R Science Symposium scheduled for Monday, January 26th. The event will take place at The...
Fertilizer Efficiency & the 4Rs: Managing High Fertilizer Prices
When fertilizer prices are high, efficiency matters more than ever. The biggest return on investment doesn’t usually come from chasing new products—it comes from doing the fundamentals exceptionally well. That’s where the 4Rs of nutrient stewardship (Right Source,...
The Science Behind the 4Rs of Nutrient Stewardship
The 4Rs of nutrient stewardship—Right Source, Right Rate, Right Time, and Right Place—are more than guiding principles. They’re grounded in decades of agronomic research showing how nutrients move through soil, crops, and water systems. At their core, the 4Rs provide...
Nominate a 4R Advocate in the Mid-Atlantic
Highlight a 4R Farmer and Crop Consultant Today Chester, Maryland - October 2, 2025 - The Mid-Atlantic 4R Nutrient Stewardship Association (MA4R) is seeking nominations for a 4R Advocate in their region. The 4R Advocate Program recognizes agricultural retailers and...
Contact Info
📞 Lindsay Thompson | 443-262-8491
📧 lindsay.mdag@gmail.com
📱 Facebook: @DEMD4RAlliance