Symptoms
Older Leaves show a yellow to brown, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Causes
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli: 5 l/ha at the 4 to 6 leaf stage. Repeat as required for moderate to severe deficiency at 7 to 14 day intervals. Water rate: 200 l/ha.
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