White spruce - Wisconsin(Kopitke 1941: JOF)

% total sugars

Lbs K2O/A

(as KCl in August)

“Timely correction of

potash deficiency are

recommended as a

prerequisite for

production of

frost resistant

nursery stock.”

(no freeze tests conducted

on whole seedlings)

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The recommendation may have originated from this study by Kopitke.

However, his conclusions were not based on statistical results or on field

results. When I examine his data, I see little or no treatment effect. In this

case, any benefit appears to be in the eye of the beholder.