How do I deal with the affected areas to help remove the risk of plant damage for future years?
In our view, rotavation is by far the best practice. This incorporates plant tissue into soils where it will decompose and allow the associated chemicals to be degraded by soil microbes. Once degraded, the chemicals should pose no further risk to crops. Ideally, thoroughly rotavate, or fork over several times as soon as possible, then repeat in late summer/ early autumn. Plant tissues generally break down most rapidly in warm, moist soils.