Understanding Plant Nutrients: Soil and Applied Potassium
Author(s) Emmett Schulte, Keith Kelling
Most Wisconsin soils need relatively large quantities of applied potassium because of removal by crops and because Wisconsin soils have little native exchangeable potassium. For example, large quantities of potassium are removed with harvests of such plants as alfalfa, certain vegetables, other forages, and corn silage. Grain and seed harvests remove much less potassium. Find out more about testing and adjusting for potassium levels in your soil in the helpful fact sheet (2 pages).