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Write the deficiency symptoms of :

(1) iron (2) zinc and calcium.


(1) Iron : It leads to intervenial chlorosis and necrosis. 

(2) Zinc : Due to the deficiency of zinc, young leaves and internodes become extermely small, resulting in little leaf rosette and mottled leaf condition .

Calcium : It's deficiency produces necrosis in the leaf and stem. Plants have a stunted growth with suppressed flowering. Flowers fall immaturely and this process is called premature fall of flower.

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Why do plants need potassium and magnesium ?

Write the deficiency symptoms of following : Nitrogen, Phosphorous, Sulphur, Potassium, Calcium and Magnesium.

Describe the natural method of nitrogen fixation.

Give a brief account about soil fertility and its depletion.

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