Plot is in back of my property near a 1 acre pond full of koi, bass and trout. I am afraid of using Round up due to possible wash off into pond. Can I just till it up and wait a few weeks then retill to avoid weeds or is that not enough to kill all that grass and weed seed?? Plot will be a mix of clover, oats, turnips, and radishes to hopefully provide full season forage. Any thoughts?? Plan was/is till....wait 3 weeks......retill and lime. Wait a week or so and if no weed sprouts show then fertilize and seed with roller or cultipacker. Sound good??