According to CRIDA how much is the Depth at which Deep Ploughing is done?

Correct option is C

The correct answer is (c) 25-30cm.
Deep tillage or deep ploughing is classified by the Central Research Institute for Dryland Agriculture (CRIDA), Hyderabad, according to the depth of ploughing.
The categories are as follows:
(a) 5-10 cm: 
· This range is considered shallow ploughing. It is used primarily for surface-level soil manipulation, breaking crusts, and preparing the top layer for seed sowing.
(b) 15-20 cm:
· This depth is classified as medium deep ploughing. It goes deeper than shallow ploughing and is used for general soil preparation, mixing organic matter, and managing weed growth.
(c) 25-30 cm:
· Deep ploughing falls into this category. According to CRIDA, this depth is effective for breaking up compacted soil layers, improving soil aeration, and enhancing water infiltration and root growth. It is particularly useful in dryland farming to ensure better moisture retention and root penetration.
(d) 35-40 cm:
· This depth exceeds the standard range for deep ploughing. It is usually not practiced regularly as it requires more power and can disrupt soil structure significantly.
(e) 50-60 cm: 
· This is considered very deep ploughing or subsoiling. It is used for specific purposes like breaking up hardpans deep within the soil profile but is not typically referred to as standard deep ploughing.