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B
Phosphorus
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C
Potash
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D
All are used in equal ratio
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Solution
The correct option is A Nitrogen
A fertilizer is
a natural or synthetic material that is supplied to plant or soil to provide
one or more essential nutrients to plant.
Nitrogen is an
essential nutrient for plant growth, development and reproduction. Despite nitrogen
being the abundant element on earth, its deficiency is seen in plants. To avoid
this nutrient deficiency nitrogen fertilizers are added to the soil.