I talked to this old couple for a few minutes. They told me they only grow wheat one season a year. After harvested the wheat, they will grow something else (I couldn't get the name due to their heavy accented Putonghua.)
It's back breaking work to tend the field and cut the wheat. They probably found it weird that I would be interesting in taking pictures of such mundane stuff. The woman was commenting to the man that I took so many shots.
I asked for one straw of wheat to show my kids, and the woman offered a whole bunch.