POTATO farmers are once again in a bind. Previously disadvantaged by a fall in the selling price of potatoes, the market has been struck by another decline, only this time it is even reaching potato centers. In the Dieng Highlands of Central Java, a national potato center, the fall in prices began two weeks ago. "The normal price only lasted for two weeks," said Head of the Dieng Potato Farmers Association, Muhammad Mudasir. The highest selling pri