Interesting reading on how (among other things) the waterhemp control in corn influences waterhemp density the following year in soybeans:
https://crops.extension.iastate.edu/blog/meaghan-anderson/are-your-weeds-declaring-%E2%80%9Ci-will-survive%E2%80%9D

Full research article cited as the reference in the ISU blog :

https://www.cambridge.org/core/journals/weed-science/article/multitactic-strategies-to-manage-herbicideresistant-waterhemp-amaranthus-tuberculatus-in-cornsoybean-rotations-of-the-us-midwest/6B7B3C6A37974085ACB1C30E1670217A