Farmers faced economic difficulties during the 1920s because of the new technology for one. New machines were created to help make farming easier and it did well at that if you were to ask me.
Another reason was because of prices of items such as grain collapsed in Britain. That's caused by the first reason of new technology. Many farmers and families where affected in a bad way by this. Due to that, many farmers had to give up or just lose their homes/land. You can assume that since prices fell, they did not receive the same amount of amount they previously did leaving them broke.
A third difficulty was caused by over producing. For example, when you go to Walmart and apples are on sale- that's because there was an over production. That leaves them with more apples and them trying to sell them for cheap to get rid of them.
All three of these helped to cause farmers economic difficulties. Now, remember later on in 1929, America had the Great Depression start. I guess you can throw that on the list as well. Since people began losing jobs many were left with little to no money. That leads to the problem people just couldn't afford farm goods such as corn, grain, and wheat.
I hope this helps!!
