At Smart Earth we're your source, for a happier horse :)

Summary: Spring barley is the most widely grown cereal in Lithuania. One of several organic solutions to the problem of spreading weeds lies in growing Camelina sativa as cover crop between the barley plantings. A series of experiments confirmed that camelina could effectively limit the prevalence of weeds under certain soil properties and weather conditions. Drilling camelina in strips between barley rows reduced the amount of weeds by 1.79 times without a significant decrease in yield when compared to a barley mono crop. Link: http://www.tandfonline.com/loi/wcim20