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Explain the significance of potassium as...

Explain the significance of potassium as a macrountrient.

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Potassium (K) :
1. Maintains turgidity and osmotic potential of the cell, opening and closure of stomata, phloem translocation, stimulate activity of enzyme, anion and cation balance by ion - exchange.
2. It is absorbed as `K^+` ions.
Deficiency symptoms : Marginal chlorosis, necrosis, low cambial activity, loss of apical dominance, lodging in cereals and curled leaf margin.
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