Intercropping leeks to suppress weeds.

Three field experiments were carried out at Wädenswil, Switzerland, in 1996-97 to study the intra- and inter-specific competition in a leek:celery intercrop with and without additional weed competition. Intercropping of leek and celery in a row-by-row replacement design considerably shortened the critical period for weed control in the intercrop, compared with the leek pure stand. The relative…