Indian soils are deficient in

Answer: Option A

At present 49% of Indian soils are potentially deficient in diethylene-triamine pentaacetate (DTPA) extractable Zinc.
Zinc is one of the eight essential micronutrients. It is needed by plants in small amounts, yet crucial to plant development. In plants, zinc is a key constituent of many enzymes and proteins. It plays an important role in a wide range of processes, such as growth hormone production and internode elongation.