Favourable weather for late-planted US crops added pressure on prices, traders said.
China's cancelled visits to Montana and Nebraska rattled soyaa traders because China is the world's biggest soyaabean importer and has slashed purchases from the United States over the past year in the countries' tit-for-tat trade war.
As US-China trade talks were held in Washington, US President Donald Trump said he wanted a complete trade deal with the Asian nation, not just an agreement for China to buy more US agricultural goods.
China recently bought some US soyaabeans, but those deals have already been digested by market, traders said.