As mentioned, if you've plowed/tilled a good fire line or made sufficient preparations, fire can be very beneficial. Around here, there is restrictions in place as to when you can do a controlled burn, so I always contact the local Fire Dept to get the OK or have them present to assist in case things don't go as planned. They're always glad to help and would do it free of charge, if I didn't insist on making a small donation.
If you were planning on tilling the field after the herbicide application, then burning the thick "mulch" would definitely be a benefit, and would make preparing a seed bed MUCH easier. Maybe two weeks or more after burning, when some of the perennials have begun to leaf out again and new seedlings have sprouted, making a chemical application then should result in a very clean seed bed. However, if you was planning on no-tilling corn or soybeans, then I would leave the thick stuff for added moisture retention through the hot summer months.
Some sprayer's do a better job with coverage in thick stuff also, I'm always amazed at the level of penetration in dense vegetation, only when the weeds/grass is matted to the ground have I seen areas where the spray didn't make a reasonable kill.
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