Never heard of a spader, and my Grandfather was a life-long farmer! I plow and then till using tractor-drawn equipment. My crops could be better, thats for sure.
I live near the Blue Ridge Mountains and the soil here is definitely rocky. I’ve pulled tons, it seems, out of my larger garden area. I’ve lots better luck with the raised beds beside our house. I plan on building several more before planting time next spring.
Late last March I planted tomatoes in one raised bed sheltered in a small portable greenhouse. Didn’t know if they would make it, but they did, and produced much earlier than what is normal here, which is usually sometime in July. We were getting tomatoes in June.