Potassium

  • Need to know: Potassium (K)

    Potassium

    Yellowing at leaf margins is typical of potassium deficiency.

    Sandier soils with low clay levels are more likely to be at or near deficiency levels. Ross McKenzie estimates that about 20 to 25% of Prairie soils are K deficient, and overall soil K levels are in a slow decline.

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  • K release from canola swaths

    Potassium

    A case where potassium washed from canola windrow resulted in clear patterns in the following wheat crop. Source: John Heard

    Have you seen patterns like this? Potassium in swathed crop is mobile and if several rainfall events fall on the swath before combining, potassium will bleed out below the swath. Since a six-foot swath contains all the straw from a 30-foot or wider cut, the K is concentrated. K-loving crops following canola can find sufficient K below the swath, but inadequate between swaths.

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  • Scout for nutrient deficiency

    Potassium

    This diagram from IPNI shows where deficiency symptoms are likely to show up on a plant. Nitrogen is mobile so with N shortage, plants will move N to new parts of the plant. Therefore deficiency will show up first in older leaves.

    This diagram from IPNI shows where deficiency symptoms are likely to show up on a plant. Nitrogen is mobile, so with an N shortage, plants will move N to new parts of the plant. Therefore deficiency will show up first in older leaves.

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  • How much fertilizer does canola need?

    Potassium

    When setting fertilizer rates, it helps to know your target yield and how much fertilizer canola needs per bushel of yield. Some of that will come from soil reserves and from organic matter. The rest has to be applied as fertilizer.

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