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Potassium
Deficiency Symptoms
Dark green plants with yellowish.  Brown leaf margins brown necrotic sports on the tips of older leaves.  Symptoms first on older leaves. leaf edge. leaf base.  Upper leaves short, droopy ‘dirty’ dark green.  Older leaves yellow to brown yellow stripes along leaf interveins, rusty brown spots on the panicles.
Correction Measure

Foliar spray of KCl @ 5gram/lit at 15 days interval up to the disappearance of symptoms