In a tree plantation trees are planted in rows (lines). In the latest release of Arboreal Forest you have a special preset: Plantation.
The user could assign a quality, line number and also assign multiple stems to each tree. The app recognizes when the user walks to a new row and gives a signal to the user.
The calculation of number of trees per hectare is calculated from the distance between trees in a line and also the distance between the lines.
If you want to know more, take a look at the movie from a Swedish seed plantation.