 some urea over the top that way because the fields have just frankly been too wet to be able to get in there with a ground rig. For Money Matters on the Iowa... Introducing Sertain Herbicide, the latest corn innovation from BASF. It brings powerful PPO residual chemistry into pre- through early post-application thanks to novel solid encapsulation technology. Apply from pre-plant to V3 and get up to eight weeks of residual control or suppression of 79 broadleaf and grassweed species.