Too much potassium inhibits uptake of which nutrient?

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Multiple Choice

Too much potassium inhibits uptake of which nutrient?

Explanation:
Excess potassium creates ion antagonism at the roots, meaning K+ competes with other cations for uptake. Magnesium is particularly affected because the transport systems and soil exchange sites in roots are sensitive to high K+, so when K is abundant, the plant takes up less Mg even if it’s available. This can lead to magnesium deficiency symptoms and reduced chlorophyll function. While some interference with calcium or phosphorus can occur, magnesium uptake is the most strongly inhibited by too much potassium, making it the best answer.

Excess potassium creates ion antagonism at the roots, meaning K+ competes with other cations for uptake. Magnesium is particularly affected because the transport systems and soil exchange sites in roots are sensitive to high K+, so when K is abundant, the plant takes up less Mg even if it’s available. This can lead to magnesium deficiency symptoms and reduced chlorophyll function. While some interference with calcium or phosphorus can occur, magnesium uptake is the most strongly inhibited by too much potassium, making it the best answer.

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