WASHINGTON (BLOOMBERG) - The United States is poised to deliver a bumper spring wheat crop in the upcoming weeks, which if realszed could help relieve global shortfalls caused by turmoil in the Black Sea.

Fields in North Dakota, the top producing US state, are forecast to yield a record high 49.1 bushels per acre of the grain, according to the final estimate of a three-day crop tour led by the Wheat Quality Council.

North Dakota makes up about half of the US's spring wheat crop.

The world is counting heavily on American farm supplies to help refill grain silos as Russia's invasion of Ukraine continues to put more than a quarter of global wheat exports at risk.

While all signs now point to an ample harvest in the US, weather woes caused growers to plant the crop later than normal.

The timing has made the wheat highly vulnerable to late-season problems that could still hurt production.

"We might have good yield potential right up until the day we get an early frost," Neal Fisher, administrator of the North Dakota Wheat Commission, said.

This year's spring wheat, prized for its high protein content and used to make pizza crusts, bagels and other foods, has been under close watch for potential problems after plantings were slowed by downpours and flooding throughout the northern Plains.

The delays followed last year's severe drought that shrank harvests in both the US and Canada.

Farmers were able to catch up, however, and largely favourable weather since then has eased supply worries.

The crop tour's outlook for North Dakota is slightly below the US Department of Agriculture's initial yield estimate of 51 bushels an acre, which would be a jump from last year's 33.5 bushels an acre.

Spring wheat has fallen about 33 per cent from the highest in more than a decade reached in May, though any sign of problems while the wheat is still in the ground could send prices soaring again and revive food inflation pressures.

Futures were up 1.4 per cent in early trading Friday along with other crops amid uncertainty over how quickly and how much grain will be shipped from Ukraine and on forecasts for hot, dry weather in the US and Europe.

"Six weeks from harvest for a lot of these fields is a long time, it's an eternity," said Dave Green, executive vice president at the Wheat Quality Council.

"We are worried a weather change or a pattern change could disrupt what otherwise looks to be like a very outstanding crop."