Which of the following statements about tillage are correct?
(a) Tillage operation in which nearly 30% crop residues are left on the soil surface is called conventional tillage.
(b) An open trench left in between two adjacent strips of land after finishing ploughing is called dead furrow.
(c) Jethro Tull was known as father of tillage.
(d) Conservation tillage has mitigation effect on climate change.

Correct option is D

· Dead furrow is an open trench left between two adjacent strips after ploughing, which helps in drainage and soil aeration.
· Jethro Tull is considered the Father of Tillage, famous for inventing the seed drill in 1701.
· Conservation tillage, which includes minimum tillage, reduces soil erosion and helps in carbon sequestration, mitigating climate change.