TALCA, CHILE — The divided highway south of Santiago quickly gives up what much of this country is about as the fields change from grapes to nuts. Chile’s renewable food industry is an exporting phenomenon for this country of almost 18 million. It has grown up quickly and now equals the country’s historic extractable resource — copper. And although Chile’s growers weren’t able to reach their past peaks of around 750,000 tons of apples shipped or prevent a light drop in table grapes, the 2015-16 growing year saw higher volumes of blueberries, avocados, and citrus.