Cover crops reduce weed seeds (online)

Cover Crops Increase Destruction of Weed Seed in Fields, Says Study 

Cover crops have been promoted for their abilities to reduce erosion and retain soil nutrients. Now there is evidence that they can significantly reduce weed seeds. Crops such as red clover, planted after a main crop’s harvest, provide cover for insects such as ground beetles that feed on weed seed. Rodents are also important consumers of weed seeds and tend to prefer foraging under the shelter provided by cover. As a result, in fields planted with cover crops, three to four times more weed seed is eliminated.