Photo/Illutration In this Sept. 21, 2018, file photo, Mike Starkey offloads soybeans from his combine as he harvests his crops in Brownsburg, Ind. (AP Photo)

BEIJING--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 raises further questions about how China will meet a target of spending billions of dollars more on U.S. agricultural goods as the two countries look to reach an initial agreement to calm an extended trade war.

U.S. President Donald Trump said in December that China had agreed to double its pre-trade war purchases of U.S. agricultural products over the next two years as part of a Phase 1 trade deal to be signed this month.

Han, a vice agriculture minister and part of the negotiating team, said last month that China would buy more wheat, rice and corn from the United States to meet demands for higher agricultural imports.

His comments led to speculation that Beijing could increase the quotas that it issues each year to grain buyers, setting the amount of wheat, corn and rice that can be imported at a tariff rate of 1 percent.

The amounts for 2020 were issued in September last year and were steady on previous years. Imports outside the quotas are rare because of tariffs of 65 percent.

Han was quoted by Caixin on Tuesday as saying the quota is offered to global markets and "we won't adjust it for one country."

U.S. Trade Representative Robert Lighthizer said in December Beijing had committed to buy an additional $32 billion of American agricultural products over two years, or roughly $16 billion a year more than the 2017 baseline of $24 billion. He said Beijing would aim for another $5 billion in farm purchases each year on top of that.

China's annual quotas are 9.64 million tons for wheat, 7.2 million tons for corn and 5.32 million tons for rice.

It has not bought large volumes of U.S. wheat, corn and rice in recent years. Soybeans made up more than half of China's agriculture purchases from the United States in 2017, at about $12.2 billion.

The agriculture ministry did not immediately respond to a request for comment.