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The effect of a Polish rapeseed (Brassica campestris L.) companion crop on establishment and yield of sweetclover (Melilotus officinalis L.) was investigated in four field experiments conducted between 1979 and 1986 at Melfort, Saskatchewan. In each test, rapeseed was seeded at 3, 5 and 7 kg ha −1  and sweetclover at 1, 4, 7 and 10 kg ha −1 . Rapeseed yield was not affected by its seeding rate or that of sweetclover. At a constant seeding rate of rapeseed, sweetclover forage dry matter yield increased as its seeding rate increased. Sweetclover yield decreased as the seeding rate of rapeseed increased only 1 year of the 3 with successful establishment. The highest mean sweetclover yield of 4020 kg ha −1  was obtained when sweetclover and rapeseed were sown at 10 and 5 kg ha −1 , respectively, and the lowest sweetclover yield was obtained at seeding rates of 1 and 7 kg ha −1 , respectively, for sweetclover and rapeseed. In 1982, when the mean rapeseed yield across all seeding rates was the lowest (1100 kg ha −1 ) compared to those of other years, the mean sweetclover yield obtained the following year was the highest (4700 kg ha −1 ). In 1985, when the mean rapeseed yield was maximum (3110 kg ha -1 ), the sweetclover yield obtained the following year was minimum (1340 kg ha −1 ).Key words: Rapeseed, sweetclover, companion crop, forage yield, seeding rate

POLISH RAPESEED AS A COMPANION CROP WHEN ESTABLISHING SWEETCLOVER FOR DRY MATTER PRODUCTION