At the same time as the grain harvest is going on, the canola crop is also being harvested around here. Canola is not a grain, but is an oilseed crop, similar to soybeans. However, the harvest is quite similar to grain harvests. It is grown for the tiny black seeds, which are used to make canola oil.
Canola fields are those fields that are brilliant yellow when they're in bloom in June and early July (see my post of July 8th). They then turn a light bluish green while the seed pods form and mature. You can see the characteristic colour in this field, and the beans forming in the close-up.
When they're ready for harvest the canola seed pods turn brown. They are usually harvested with a combine, as is wheat.