what kind of hand spreader? like a push type lawn broadcast spreader? Or a bag spreader? I use the push type broadcast spreader. I usually hit the brassicas with N when they are 3-6" as long as there is sufficient rain on the way, and i would say that the plants that get trampled end up bouncing back or others fill in. Not sure how much difference an atv/utv/scut with spreader would be? I would generally think that the damage would be minimal.