Informational Links About the 4R Nutrient Stewardship Certification Program:

• Indiana 4R Nutrient Certification Program Informational Brochure
• Indiana 4R Certification

Indiana 4R Nutrient Stewardship Certification Program documents and guidance:

• Indiana 4R Certification Manual
• Indiana 4R Certification Standard

Tools for 4R Certified branch locations and those wanting to become 4R certified:

• Grower List
• Grower Signature Form
• 4R Grower Postcard
• Purdue University Soil Sampling Guidelines
• Tri-State Fertilizer Recommendations
• NOAA – National Weather Service
• National and State Fertilizer Laws
• Indiana Natural Resource Conservation Service 590 Standard
• Purdue University Nitrogen Management Guidelines for Corn in Indiana
• Corn Nitrogen Rate Calculator
• Indiana Department of Environmental Management Confined Feeding Program
• Office of Indiana State Chemist Fertilizer Laws and Regulations