Justin Knopf, a central Kansas farmer who was featured in the acclaimed book "Rancher, Farmer, Fisherman" for his practical approach to sustainable farming, is now being highlighted in a documentary that will premier at 8 p.m. CDT on the Discovery Channel on Aug. 31.

Knopf, who farms near Salina, said sustainability—or, in a simple sense, protecting the land and natural resources for future generations while growing food crops today—is something that is important to farmers.

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