Understanding the role of non-exchangeable potassium in Minnesota soils

SUMMARY points – year 1

• Study is in the initial stages, and we have not fully collected 1 year of data.
• Soil test K significantly declined from the initial to the first sampling date in the greenhouse trials. After 7 sampling dates. STK is roughly 8-42% of the initial sol test values.
• Soil test K decline was larger during the first sampling period and has not changed much since the first sampling period
• Relationships between soil test K decline, non-exchangeable K in the soil, and K removal have not been evaluated at this time.