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Sulfur in Canola

A field of winter canola in bloom.
Sulfur–like N–is an essential element for plant growth and frequently a limiting factor in agricultural systems. Sulfur is taken up by plants as the anion sulfate (SO4). In wet years, SO4 may leach deep into the soil profile. When developing a canola nutrient management plan, soil samples for SO4should be taken to a depth of 3-5’. In the canola plant S is an immobile nutrient which means deficiency symptoms will most likely show up on new leaves. Frequently, S deficiency symptoms do not show up until the plant has initiated bolting. S deficiency is characterized by cupped and purple leaves on the stem.
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