According to the experts these pictures are a sign of good soil structure. The reason that the spade pushes harder in well structured soil is the soil particles are glued together into aggregates that resist breaking apart.
 (harlans sq nef rye roots 4 22 2016 1.jpg)
 (douglas soil structure 4 27 2015 1.jpg)
Attachments
----------------
 harlans sq nef rye roots 4 22 2016 1.jpg (140KB - 157 downloads)
douglas soil structure 4 27 2015 1.jpg (196KB - 138 downloads)
| 
Soybean ground tillage.
