Question

A plough which can enter up to 60-90 cm without disturbing top soil and also useful in moisture conservation in rain-fed areas is

• A. Harrow plough
• B. Rotovator
• C. Sub-soiler
• D. Rotary plough

Hint:

Sub-soiler = "Below the soil." It breaks the "basement" of the field so water can soak in.

Answer 1

The Correct Option is C

Step 1: Concept
Deep tillage implements are used to break up hardpans (compacted soil layers) beneath the normal plough depth.

Step 2: Meaning
Breaking these layers allows roots to go deeper and water to infiltrate more easily.

Step 3: Analysis
A sub-soiler has a heavy, thin shank that slices through the earth at great depths (60-90 cm). Because it is a thin blade, it shatters the lower layers without turning over or mixing the topsoil.

Step 4: Conclusion
The sub-soiler is the only implement among the options designed for this specific depth and function.
Final Answer: (C)