WASHINGTON, Sept. 27, 2017 - Farmers from Maryland to Illinois are turning their soil into a kind of sponge and absorbing the benefits: Planting cover crops such as cereal rye and varieties of radish during harvest season can simultaneously enhance the soil and increase yield. New studies support what farmers and agronomists have been saying for years – that cover crops reduce nutrient runoff, improve soil health and, most important for farmers, increase yields.