Prince of pesticides has seen his fortune swell $2 billion as fertilizer, chemicals soar. Iowa farm boy shunned family business when older brother took over from parents. Sold fertilizer, seeds for local co-op. Founded Albaugh Inc. 1979. Company broke even 1980s. Began selling generic version of glyphosate, main ingredient in Monsanto's Roundup herbicide, after patent expired in 2001. Bought Argentinean factory to manufacture chemical, gained edge over competition. Expanding to Europe, Brazil. Sales now $1.1 billion, up 38% from last year. Selling out: began taking bids for firm in July.