Potassium and winter injury

In their recently published article, "Observations on the Effect of Potassium on Winter Injury of Annual Bluegrass in New Jersey in 2015", Charles Schmid and colleagues at Rutgers University concluded that potassium defficiencies can lead to severe winter injury.

But just how much soil potassium was needed?

Researchers noted that test plots with soil potassium levels of 28 ppm (Mehlich III) and 1.3% tissue potassium had up to 58% of the area damaged by ice cover. Plots with 70 ppm…