4R Spring Nutrient Reminders

1. Soil test on a consistent basis.

You can’t manage phosphorus if you don’t know the level of the nutrient in the field. Long term, consistency of depth is what adds value to soil sample data. 
  • 4R requires soil sampling at least once every four years 
  • Grid sampling is preferred, but using a composite sample that represents no more than 25 acres is accepted 

2. Calculate the form and individual phosphorus balances.

Use yield maps to identify crop removal rates compared to the sources of P you are applying. 
  • Consider both fertilizer and manure 
  • Biosolids and compost need to be accounted for as well 

3. Placement is very important.

Whenever possible, place phosphorus in the soil and not on the soil. 

4. Tissue tests are valuable in-season tools.

Adjust your fertility program based on what you learn, and potentially improve your yield outcome. 

5. Farmers benefit from working with a professional.

Retailers who have a “certified level” of knowledge have the experience and expertise to provide sound technical advice that’s tied to the 4R’s of sustainability: 
  • Right Source 
  • Right Rate 
  • Right Time 
  • Right Place 
Precision ag technologies are helping farmers become better stewards. 


Click here to download the 4R Spring Management Reminders sheet.