Actually you do, at least when planting on a large scale. A planting plough is pulled behind a tractor, the device opens a furrow into which seedlings are dropp

Actually you do, at least when planting on a large scale. A planting plough is pulled behind a tractor, the device opens a furrow into which seedlings are dropped at a regular interval by someone riding the plough or mechanically. The furrow is closed with the top of the seedling sticking out. Here's how you can convert an old plough to a tree planting plough: https://core.ac.uk/download/pdf/228205053.pdf https://core.ac.uk/download/pdf/228205053.pdf