(Reuters) -U.S. President Donald Trump said on Sunday that he hoped China would quadruple its soybean orders from the U.S, adding that it was also "a way of substantially reducing" Beijing's trade deficit with Washington.

"China is worried about its shortage of soybeans. Our great farmers produce the most robust soybeans. I hope China will quickly quadruple its soybean orders. This is also a way of substantially reducing China's Trade Deficit with the USA. Rapid service will be provided. Thank you President XI," Trump said on Truth Social.

A tariff truce between Beijing and Washington is set to expire on August 12, but the Trump administration has hinted that the deadline may be extended.

China, which takes more than 60% of soybeans shipped worldwide, buys the oilseed mainly from Brazil and the United States.

The most active soybean contract on the Chicago Board of Trade (CBOT) was up 2.13% at $10.08 a bushel at 0446 GMT, having been little changed before Trump's post.

China imported roughly 105 million metric tons of soybeans last year, just under a quarter coming from the U.S. and the remainder from Brazil. Quadrupling shipments would require China to import the bulk of its soybeans from the U.S.

"It's highly unlikely that China would ever buy four times its usual volume of soybeans from the U.S.," Johnny Xiang, founder of Beijing-based AgRadar Consulting, said.

It is unclear if securing China's agreement to buy more U.S. soybeans is a condition for extending the trade truce.

China's Ministry of Commerce did not immediately respond to a Reuters request for comment.

The country has steadily reduced its reliance on U.S. soybeans in recent years, shifting more purchases to South America.

Under the Phase One trade deal signed during Trump's first term, China agreed to boost purchases of U.S. agricultural products, including soybeans. However, Beijing ultimately fell far short of meeting those targets.

This year, amid Washington-Beijing trade tensions, it has yet to buy any fourth quarter U.S. beans, fuelling concerns as the U.S. harvest export season approaches.

"On Beijing's side, there have been quite a few signals that China is prepared to forego U.S. soybeans altogether this year, including booking those test cargoes of soymeal from Argentina," said Even Rogers Pay, an agricultural analyst at Trivium China.

Reuters previously reported that Chinese feedmakers have purchased three Argentine soymeal cargoes as they aim to secure cheaper South American supplies amid concerns about a possible soybean supply disruption in the fourth quarter.

U.S. soybean industry has been seeking alternative buyers, but no other country matches China's scale. Last year, China imported 22.13 million tons of soybeans from the U.S., and 74.65 million tons from Brazil.