Algerian farmers harvest a potato field in Khemisti, 60 km (37 miles) west of Algiers, April 19, 2009. Algeria is suffering a potato shortage because officials have imposed strict controls on the use of fertiliser to stop al Qaeda militants using it as a bomb-making ingredient, farmers said. Security experts say ammonia, used by farmers to improve crop yields, has also been found in bombs detonated by Algerian militants affiliated to al Qaeda. Picture taken April 19, 2009. REUTERS/Louafi Larbi(ALGERIA POLITICS CONFLICT AGRICULTURE)
REUTERS/Louafi Larbi