Nov. 21—OTTUMWA — In the end, Kent Walker couldn’t pass up the chance to help set the tone for the future. Through the Sustainable Iowa Land Trust, he will do just that. Walker, a longtime Ottumwa dermatologist, signed over his 60 acres in Dahlonega Township to SILT during a ceremony Friday at Appanoose Rapids. The land, in Walker’s name for almost a decade, will be used for long-term food …