Gail Fuller is a farmer by occupation; he also is equal parts philosopher and futurist. This Emporia, Kan., farmer quotes an ancient philosopher: “To be a successful farmer, one must first know the nature of the soil,” he says, quoting Xenophon of Athens, a Greek author who wrote those words nearly 2,500 years ago. From Fuller’s point of view, “knowing the soil” has slipped pretty far down the priority list in today’s agriculture. But it is job one at Fuller Farms.