KlopKlop
Crowing
If you really want to kill off the seeds, solarize it. That's basically cover it with black plastic for several weeks so the ground below get hot & kills the weed seeds. That will kill seeds up to 6 " deep. then don't till it. Tilling brings up more seeds. I personally don't like using RoundUp where I'm planting food crops. Rotation is a great idea, chicken poop will really add to the ground. I would get a pH tester to make sure the soil doesn't get too hot with the poo. Just food for thought.
I did my homework on solarization but i don't think it will work for me for 2 reasons:
1) cost - tarp is expensive and the area is very large
2) I don't have 6 weeks between when all my tomatoes and peppers are out and where the weather will be good enough for it
I try my best to avoid chemicals especially around my food but I am hoping having the winter for the roundup to dissipate will be enough. I can also run a layer of cover crop (thinking buckwheat and vetch or mustard)) before i plow.