In the fall, some farmers plow the remains of
corn plants into the ground. This activity
contributes most directly to the
(1) increase in the biodiversity of their fields
(2) depletion of nonrenewable resources
(3) destruction of natural habitats
(4) recycling of organic matter
It could be either 1 or 4. It's mostly a practice that allows farmers to plant cover crops, and to also allow the nitrates and other minerals in the soil to return to normal and retain it more