This is a tremendously broad topic - there have been numerous types of changes that have impacted agriculture on the American Great Plains over the years.
In considering changes that have occurred since European settlers began coming to the Great Plains, one of the first revolutions might be considered the introduction of fences. The end of raising livestock on the open range revolutionized how livestock were handled.
The invention of the steel-blade plow in 1836 was another revolutionary development. The ability to break up and plow the prairie opened vast new areas to be developed; it also set the stage for the conservation and soil-erosion challenges of the Dust Bowl and current farming practices.
Modern irrigation, hybrid seeds and increased use of fertilizers have also revolutionized yields and the impact of agricultural use upon the soil.