JOSH FUNK, PAUL WISEMAN and JOE McDONALD
AP Business Writers
OMAHA, Neb. (AP) — President Donald Trump likes to joke that America's farmers have a nice problem on their hands: They're going to need bigger tractors to keep up with surging Chinese demand for their soybeans and other agricultural goods under a preliminary deal between the world's two largest economies.
But will they really?
From Beijing to America's farm belt, skeptics are questioning just how much China has actually committed to buy — and whether U.S. farmers would be able anytime soon to export goods there in the outsize quantity that Trump has promised.
It amounts to $40 billion a year, according to Trump's trade representative, Robert Lighthizer. If you ask the exuberant president himself, though, the total is a