Mineral Nutrition

Mention the artificial methods involved in the restoration of soil fertility.

Artificial methods That restore the fertility of soil are :

(1) By adding farm yard manure or animal excreta to the soil.

(2) By adding fertilizers, manure.

(3) By green manuring.

(4) By crop rotation.

(5) By controlling over-grazing.

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Why do plants need potassium and magnesium ?

List the criteria for essentiality of elements.

Write the deficiency symptoms of :

(1) iron (2) zinc and calcium.

Describe the natural method of nitrogen fixation.

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