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GS Geography Physical Geography of World
Q.

For the cultivation of Tobacco the soil should be rich in:
Explanation:

ANS. (D) 
Tobacco is a crop that needs significant amounts of potassium. It is a fast growing plant, between 80 and 150 days, with a high daily potassium requirement. Potash is the common name for various mined and manufactured salts that contain potassium in water-soluble form. In some rare cases, potash can be formed with traces of organic materials such as plant remains, and this was the major historical source for it before the industrial era.

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