BEIJING (Reuters) - China will not increase its annual low-tariff import quotas for corn, wheat and rice to accommodate stepped-up purchases of farm goods from the United States, local media group Caixin quoted senior agriculture official Han Jun as saying on Tuesday. The report underlines China’s desire to protect its farmers at a time when it is under pressure to buy billions of dollars more of U.S. agricultural goods to calm a prolonged trade war, although its grain imports have been well below quota levels in recent years. Traders and analysts said the announcement appeared to be aimed at local...