If you have just tilled or cleared some land for planting, let it sit for two weeks so you can pull out the weed seedlings that have come up before planting. That will help you distinguish your new seedlings from the weeds.
We tilled too soon (soil was still too wet) and now have hard-as-a-rock clumps. Any way to fix this?
Hardiness Zone: 5b
By lrachel from KS
I had done the same thing one year. Just let it completely dry again and chop it good with a hoe. Don't put fertilizer until after though because it will take longer to dry out. You might have to just get in there with your hands to break it up. It'll be a pain no matter what you do but worth it down the line, because if left in clumps, roots are not protected and plants won't produce very well.