I have been working on a field trial with preemergent herbicides at a grower's field and thought I would share the results from what we have seen. This is reused recycled soil that has had various preemergent herbicides applied as soon as pots were filled. We did two plots for each herbicide and we only did one plot of non-treated control. We took pictures at two and four weeks after treatment (WAT). This soil suffers from an abundance of nutsedge which is not normally an issue in potting soils due to its propagation from tubers and not from seeds. This happens to be prevalent due to the process of reusing the old soil.
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