set-aside
idle land
fallow
fallow field
fallow land

Behind them was a fallow field, standing tall with weeds.

In spite of having moved production, the family held onto the mostly fallow fields.

Why has the museum treated design like a fallow field?

The site was being transformed from a fallow field into a colorful theme park.

But right now they are not willing even to walk across one of his fallow fields.

She began it when reclaiming the fallow fields here in 1975.

She spoke briefly, indicating the broad, fallow fields all around them.

They do it for the same reason a farmer plows a fallow field.

He looked out across the railroad tracks toward the fallow fields.

Then he raised his head and looked out at the empty, fallow fields again.