Mayfield, KY – Heavy rains have soaked the region over the past few weeks and that could mean lower crop yields for farmers. Graves County Agriculture Agent Kenny Perry says by now corn farmers should have most of their crop planted, but rain has meant only about forty percent of the corn is in the field. Perry says much of that may need to be replanted because of rot and washout. He says farmers face a ten percent lower crop yield right now, with that number increasing one percent every day. Tobacco farmers have also been affected. Perry says many don't have their plants in the ground yet. If farmers aren't able to plant by the end of May, some may choose to switch over to soybeans, which have a longer pollination time.