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Excess of Mn in soil leads to deficienc...

Excess of Mn in soil leads to deficiency of Ca, Mg and Fe. Justify.

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**Step-by-Step Solution:** 1. **Understanding Manganese Toxicity**: Excessive manganese (Mn) in the soil can lead to toxicity when absorbed by plants. This toxicity can disrupt normal physiological processes within the plant. 2. **Symptoms of Manganese Toxicity**: The toxicity of manganese manifests in plants through visible symptoms such as the appearance of brown spots on leaves, which are often surrounded by chlorotic (yellowing) veins. This indicates that the plant is struggling to maintain proper nutrient balance. 3. **Reduction in Nutrient Uptake**: One of the primary reasons for the deficiency of calcium (Ca), magnesium (Mg), and iron (Fe) in the presence of excess manganese is the reduction in the uptake of these essential nutrients. High levels of Mn can interfere with the plant's ability to absorb Fe3+ ions, which are crucial for various metabolic processes. ...
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