Mike Roberts has been promoted to general manager of the Frostproof, Fla.-based Griffin Fertilizer Co. from director of sales and marketing.

Roberts joined the company in November 2011, having spent four years as regional manager at AgraQuest Inc. prior to joining Ben Hill Griffin Inc., according to his LinkedIn profile.

Roberts earned a bachelor of science degree in citrus production from Florida Southern College in Lakeland.

He also is a certified crop adviser.