Nitrogen fertilizer prices will fall by nearly 50 percent as the result of lower corn prices and growing fertilizer production in the Midwest, fertilizer consultant Jeff MacKenzie said last week at the Iowa Farm Bureau’s Economic Summit in Ames.

"I believe nitrogen will stabilize at $400 a ton, down from $700 a ton," said MacKenzie, who is helping develop the new $1.8 billion Orascom fertilizer plant in...