by Jenny Wiggins, Financial Times, UK - Historically, there have been tenuous links between farmers and food producers, with many companies having scant knowledge of how and where their ingredients are grown. But as the prices of raw materials soar – from the barley used to make beer or the cocoa used to make chocolate – leading brewers and food manufacturers from Cadbury Schweppes to Diageo are increasingly recognising their businesses will benefit from investment in agriculture.