In this latest episode of 15-Minute Friday, Host and Harrell's Director of Agronomy, Dr. Jeff Atkinson, discusses the vital element of potassium and how to determine which source will be best for your turf.

Minimum Level of Sustainable Nutrition (MLSN) threshold guidelines define soil K deficiency as less than 37 parts per million. Relative to other cations, K is weakly held on soil cation exchange sites making it especially susceptible to losses through leaching.

Most modern putting greens are sand based with low cation exchange capacity (CEC). A combination of low soil CEC and low cation binding affinity is a recipe for deficient soil potassium.

Soils in areas with a high annual rainfall total often have low soil K concentrations, as much of plant-available K is lost through leaching. Whatever the reason for deficiency, there are several common options to supplement K and reasons why and why not to use each source.

For more on potassium, read Dr. Atkinson's article on POLYON 0-0-50:
https://harrells.com/Blog/Post/the-po...
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