Double back wheat

One of the things I hope to do with my blog is show people things they might not see every day.  The picture below shows wheat planted with a 15 inch row planter.  The farmer then doubled back to try and make the rows 7.5 inches wide.  Why would he try this?  I suppose because he did not have a drill.  A number of years ago, researchers looked at row width for wheat.  The found that 10 inches was not terrible, but anything wider was too wide.  The person who planted this wheat was trying to take that into account, but the double back was not too accurate.  It would be interesting to know yield, but not sure whose land it is.