Which important greenhouse gas (other than methane) is produced in agricultural fields?

What is a pesticide?

$A$: Intensive agriculture leads to negative soil pollution.
$R$: It increases useful mineral contents in the top layer of soil.

Endosulphan is a

Assertion : Agricultural output increased several times after introduction of $DDT$.
Reason : $DDT$ was the first insecticide used on a wide scale.

Most effective pesticides are