NELIGH, Neb. (AP) — Opponents of a proposed pipeline that would carry Canadian oil south to the Gulf Coast hope to cultivate more resistance to the project by planting corn in the shape of a message.

About four acres of Ponka red corn will be planted this weekend in a field near Neligh, Nebraska, to fill out an anti-pipeline message carved into the ground earlier this spring.

The 80-acre artwork reads “Heartland#NoKXL.” It is one of the latest protests against TransCanada’s proposed Keystone XL pipeline that needs presidential approval before it can be built.

TransCanada has said the pipeline will have upgraded safety measures and will offer the safest way to transport the oil across Montana, South Dakota, Nebraska and Kansas.

Critics of the project fear it could contaminate groundwater and contribute to pollution.