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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The plant can tolerate a specific number of micronutrients only. Even a slightly lesser amount or more of it can cause deficiency or toxicity. It is generally observed that the toxicity of one element can lead to a deficiency of others. For example, in the case of toxicity of manganese, elements like calcium, nitrogen, iron become deficient because when manganese is stored in excess by plants, the calcium is translocated to the shoot apex and deficiency of elements like Magnesium, Iron, and Nitrogen are induced. In such cases, farmers should use these nutrients in their limited concentration as prescribed to prevent any deficiency or excessive intake.

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