An agreement for China to immediately resume purchases of U.S. soybeans boosted markets last week, pushing futures prices to seasonal highs. 

The purchases were part of a trade agreement announced by President Donald Trump after meetings last week with China President Xi Jinping in South Korea. 

The White House said China agreed to buy 12 million metric tons of U.S. soybeans, or 440 million bushels, between now and January. China pledged to purchase 25 million metric tons (918 million bushels) of U.S. soybeans annually over the next...