KAMPALA (Reuters) - Uganda coffee exports for September fell by 7 percent to 207, 927 60-kg bags of coffee compared with the same month a year ago, an industry source said on Thursday, extending a pattern of lower exports this year. Industry experts in Uganda, Africa's number one exporter of coffee which mostly cultivates the robusta variety, said the coffee yield is usually poorer in some parts of the country at this time of the year. "We’re at the tail end of the harvest in the south and south western (coffee) growing areas... typically we tend to get small yields," said a source at the Uganda Coffee Development Authority.