On a scorchingly hot day in the American Midwest, Tim Maxwell is voicing his fears about the future of farming.

The 65-year-old has worked the fields since he was a teenager. He now owns a grain and hog farm near Moscow, Iowa - but he's unsure about its prospects.

I'm in a little bit of a worried place, says Mr Maxwell, who wears a baseball cap bearing the logo of a corn company.

He is concerned that American farmers aren't able to sell their crops to international markets in the way they could in previous years, in part because of the fallout from President Trump's tariffs.

Our yields, crops and weather are pretty good - but our [interest from] markets right now is on a low, he says. It's going to put stress on some farmers. His fears are not unique. US agricultural groups warn that American farmers are facing widespread difficulty this year, mostly due to economic tensions with China.

Since April, the two countries have been locked in a trade war, causing a sharp fall in the number of Chinese orders for American crops. As a result, the number of small business bankruptcies filed by farmers has reached a five-year high.

With all this economic pain, rural areas could well have turned against Trump. But that doesn't seem to be happening. Rural Americans were one of the president's most loyal voting blocs in last year's election, when he won the group by 40 percentage points over Kamala Harris.

Polling experts say that in the countryside, he is still broadly popular. Mr Maxwell says he is sticking with Trump, despite his own financial worries.

Our president told us it was going to take time to get all these tariffs in place, he says. I am going to be patient. I believe in our president. So why do so many farmers and other rural Americans broadly continue to back Trump even while feeling an economic squeeze that is driven in part by tariffs - the president's signature policy?

If you want a window into rural America, the Iowa State Fair is a good start. The agricultural show attracts more than one million visitors over 10 days.

There is candy floss; deep-fried hot dogs on a stick for $7 (£5) - known as corn dogs. But when the BBC visited last month, there was another topic of conversation: tariffs.

A lot of people say he's just using tariffs as a bargaining chip, as a bluff, says Gil Gullickson, who owns a farm in South Dakota. But I can say: history proves that tariffs don't end well.

In April, what he termed liberation day, Trump imposed sweeping tariffs on most of the world, including a 145% tariff on China. In response, China put a retaliatory 125% tariff on American goods - a blow to farmers in the American Midwest, sometimes known as the corn belt. Last year Chinese companies bought $12.7bn (£9.4bn) worth of soybeans from America, mostly to feed their livestock.

September is harvest season, and the American Soybean Association (ASA) has warned that soybean orders from China are way below where they should be at this point in the year. Tariffs have fluctuated dramatically since they were introduced - and the uncertainty is proving tough for farmers.

The cost of fertiliser has rocketed, too - partly because of trade disputes with Canada, which has raised the cost of potash, a salt imported from Canada by American farmers and used in fertiliser.

Despite financial pressures, the rural Americans we spoke to are firmly sticking with Trump. A survey by Pew last month found that 53% of rural Americans approve of the job Trump is doing, far higher than the 38% figure for the country as a whole. Though a survey by ActiVote earlier this month did find a small decline in Trump's approval among rural voters from 59% in August to 54% in September.

Many farmers believe that the US president will eventually deliver results. At the Iowa State Fair, John Maxwell, a dairy farmer and cheese producer from Iowa, expressed optimism, saying, We think the tariffs eventually will make us great again. On the other hand, experts warn that uncertainty around tariffs could inflict long-term damage, as trading relationships shift and supply chains are disrupted.

Farmers are giving Trump a chance but expect results soon.