Sitka spruce - UK(Benzian 1974: Forestry)

Increase in 1st yr growth (cm)

125 Lbs K/A (as KsSO4 in September)

“In the few experiments

which tested late-season

potassium in the nursery,

K concentrations were

increased from deficiency

to barely sufficiency level:

growth in the forest was

increased in 2 of the 4

experiments. The extra K

had no effect on frost damage.”

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Field studies in England failed to show any benefit of K on

reducing frost damage.