MEXICO CITY (AP) - The Mexican army says it has found the largest marijuana plantation ever detected in Mexico.

The army says the marijuana fields covers almost 300 acres (120 hectares) in Baja California state.

The plantation is four times as large as the marijuana fields found at a ranch in northern Chihuahua state in 1984.

More recently, authorities found a 153-acre (62-hectare) plantation in southern Oaxaca state.

Soldiers destroy such fields by cutting down and burning the plants.

The Defense Department said Thursday that the huge field was found by soldiers during a patrol on Tuesday. The department did not specify where the fields were found, but said journalists would be taken to view it.

(Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)