Ncert Exercises & Solutions

A farmer adds/supplies Na, Ca, Mg and Fe regularly to his field and yet 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 plant.

Plant can tolerate a specific amount of micronutrients. A slight lesser amount of it can cause deficiency symptoms and a slight higher amount can cause toxicity. The mineral in
concentration which reduces the dry weight of the tissues by 10% is called toxic concentration .

This concentration is different for different micronutrients as well as for different plants e.g.,

{Mn}^{2 +}

is toxic beyond

600 μ {gg}^{- 1}

for soyabean and beyond

5300 μ {gg}^{- 1}

for sunflower.

It has also been observed that the toxicity of one micronutrient causes the deficiency other nutrients. To overcome such problems, farmers should use these nutrients prescribed concentration so that the excess uptake of one element do not reduce the uptake of other element.

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