One of the things I enjoy seeing in the Palouse are the crop dusting planes as they maneuver their way around the fields. Much of the fertilizer and chemicals are applied with this method.
In the photo at the top of this page, you see a pilot getting into position to dispense a load of dry fertilizer onto the terrain. I had talked with this pilot at a small airstrip near Colfax a few minutes earlier. He had given me directions to get into a position where I could observe him doing his work.
Generally the times you will see the planes applying the chemicals is in the early morning as the air is usually calmer at that time. If you want to watch a form of aerial acrobatics being put to good use in the farming process, travel to the Palouse and enjoy.