Tarai’ soils are deficient in

✅Explanation:
The terai soils are rich in nitrogen and organic matter but are deficient in phosphate. These soils are generally covered by tall grasses and forests but are suitable for a number of crops such as wheat, rice, sugarcane, jute etc.
Important Points
-Alluvial Soils are found in Terai.
-This soil has been deposited by 3 important Himalayan river systems such as the Indus, the Ganga, and the Brahmaputra. 
-This soil is also found in the Eastern Coastal Plains, particularly in the deltas of the Mahanadi, the Godavari, the Krishna, and the Kaveri rivers.
-It consists of various proportions of Sand, Silt, and Clay.
-Such soil is more common in piedmont plains such as Duars, Chos, and Terai.
-It can be classified as Old alluvial (Bhangar) and New alluvial (Khadar).