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U.S. farmers sold freshly harvested soybeans directly off their combines for a profit as prices rose to a four-year high this autumn, a welcome change from the losses suffered during the U.S.-China trade war.

Strong exports to China as the world's top soybean importer emerged from lockdown helped push the most-active soybean futures contract at the Chicago Board of Trade up 12.3% between Aug. 1 and mid-September, when harvest kicked into gear across the U.S.

But the unusual surge came too late for many Brazilian farmers, on the opposite southern hemisphere growing cycle, who had already committed to selling their crops at much lower prices and may now seek to renegotiate contracts with buyers.

Brazil ran out of the oilseed earlier than usual this year. It has sold so much to China that in recent weeks local companies had to import soybeans — a rare event for the world's top exporter. Those imports included 33,000 tons from the United States. That is a tiny amount by global trading standards but the most U.S. soy Brazil has purchased since 1997.

Brazil had been the primary beneficiary of the U.S.-China dispute started by President Donald Trump in 2018 as China relied on South America for almost all its soybean needs. But global market forces are finally helping U.S. farmers.

After signing a Phase 1 trade agreement in January, China started ramping up U.S. soybean purchases in the second half of the year, helping spur the largest late summer soybean price rally in 13 years.

U.S. farmers who waited for the harvest to start in September before selling their crops rather than committing them early were rewarded handsomely with sales straight from the fields to processors and elevators.

"For once it was the right thing. ... Usually the best opportunities to sell for fall are March through June, but the world came to an end in March," said Jed Olbertson, a farmer in Norway Center, S.D., referring to the sharp decline of commodity prices as the COVID-19 pandemic hit.

Brazilian farmers, who start harvesting in January, pre-sold roughly half of their crop before August, according to grain group Aprosoja. The price differences expected at harvest evoke memories from the 2003-2004 season when they refused to deliver grains sold in advance.

Frederico Humberg, owner and chief executive of fast-growing trading house AgriBrasil, said that a majority of contracts have "no guarantee" that the grain will be delivered, as there is no prepayment of the grains by buyers.

"If Chicago prices and the dollar continue to be at current levels, problems will occur," Humberg said. "Come time to collect the beans, farmers may allege yields fell or some kind of weather problem in a bid to improve the terms of the grain sale done in advance."

Buyers from two large U.S. companies with operations in Brazil, who spoke on condition of anonymity, said there is also a risk of nondelivery. Farmers presold their beans when the 60-kilogram bag was around 80 reais, they said, less than half of the 170 real ($31.26) current price level.

Soy prices in Brazil closely mirror Chicago, taking into account local port premiums and freight prices. Soybean prices are holding around their highest in more than four years after the autumn rally, which was spurred by storms and dry weather in both the United States and Brazil, as well as strong exports.

Soy processing plants and meatpackers in Brazil, a top global meat supplier, face much higher costs for feed, fueling food inflation. The country even modified regulations on genetically modified soy to allow it to import additional soybeans from the U.S.

Farmers will also face higher costs for imported seeds and fertilizer as Brazil's currency weakens against the dollar.