CSU fact sheet on potato fertilizer requirements.
- Proper nitrogen management is one of the most important practices for high-yielding, high-quality potato production.
- Apply nitrogen fertilizers at rates based on expected crop yields minus credits for residual soil nitrates, nitrogen mineralized from soil organic matter, previous legume crop residues and manure, and nitrate-nitrogen present in irrigation water.
- Apply phosphate fertilizers at rates based on soil test results.
- Most Colorado soils contain sufficient potassium for potato production.