In September of 2012, as a record-setting drought impacted farms across the United States, reports of an interesting nature kept popping up related to cover crops. A number of farmers who were using cover crops had started fall harvest and were finding that their corn (Zea mays L.) and soybean (Glycine max [L.] Merr.) fields planted after cover crops seemed to have better yields, in some cases with a sizeable benefit. This ran counter to the prevailing thought at the time among many farm advisors, which was that cover crops would hurt commodity yields in a dry year.
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Rob Myers (2015) studied this question.