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A farmer adds/supplies Na, Ca, Mg and Fe...

A farmer adds/supplies Na, Ca, Mg and Fe regularly to his field and yet he observes that the plants show deficiency of Ca, Mg and Fe. Give a valid reason and suggest a way to help the farmer improve the growth of plants.

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### Step-by-Step Solution: 1. **Identify the Elements Supplied**: The farmer regularly adds sodium (Na), calcium (Ca), magnesium (Mg), and iron (Fe) to his field. 2. **Observe the Deficiency**: Despite the regular supply of calcium, magnesium, and iron, the plants show deficiencies of these very elements. 3. **Consider Manganese Toxicity**: A potential reason for this deficiency could be the presence of excess manganese (Mn) in the soil, leading to manganese toxicity. ...
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