Five Years Ago * DeKalb Genetics Corp., DeKalb, Ill., has determined to hunt a possible sale of the business. "The time has get to for the company to consider combining with other business entities to render certain that shareholders receive the maximum value available," said Bruce Bickner, chairman and CEO of DeKalb. * The boards of directors of Harvest States Cooperatives, Falcon Heights, Minn., and Cenex Inc., Inver wood Heights, Minn., have approved a merger of the brace organizations to create Cenex Harvest States Cooperative. Ten Years Ago * Michael