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Birdsfoot Trefoil Stand Establishment as Influenced by Control of Vegetative Competition¹

Synopsis: Yields of birdsfoot trefoil in the year of seeding, 1957, and in the year following, differed widely between methods of controlling vegetative competition in 1957. These methods included hand weeding, companion crop management and the use of selective herbicides, dalapon and 4(2,4-DB). Yields in 1957 and 1958 were more closely associated with size of seedling trefoil plants in 1957 than to their number. By the time of the first harvest of the second year after seeding, there were no significant effects from the treatments.

² Associate Professor of Agronomy (now Professor of Agronomy at the University of Wisconsin), and Graduate Assistant (now County Extension Assistant in Hardin County Iowa). Appreciation is expressed to D. W. Staniforth, Botany Dept., for his valuable assistance in planning and conducting this work.