Sub-surface tillage  tools  are  used  to work

  1. at a shallow depth
  2. at deep depth
  3. to invert the soil
  4. none of the above
Anurag Mishra Professor Asked on 18th April 2016 in Physics.
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Answer: (2) at deep depth 

Anurag Mishra Professor Answered on 22nd April 2016.
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