When thinning seedlings (salads, beetroots, spinach etc) I will normally pull out the entire plant (root included) of the discarded seedlings. Like it's a weed.
Where my seedlings are densely packed this is nearly impossible to do without disturbing and possibly damaging the remaining "good" seedling.
So is it sufficient to just pinch out the discarded seedlings and leave the root system in there? That way I've given the remaining seedlings the space they need above ground. But presumably they also need the room underground too? Will the left over roots make way and/or die off fast enough?
So is decapitation a valid thinning strategy?