Question

Which deep tillage operation, carried out using a heavy-duty implement with narrow, chisel-like tynes that penetrate well below the normal ploughing depth, is specifically used to break up a compacted hardpan layer in the subsoil without inverting or bringing the deeper soil layers to the surface?

A Mould board ploughing
B Disc ploughing
C Rotary tillage
D Harrowing
E Subsoiling
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