A comparative yield trial has been made on 9 cultivars of grasses, legumes and fodder radish introduced from the Netherlands, with 2 available cultivars N. F. G. perennial ryegrass and Kungjung Chongtae radish as controls at Suweon and Cheju for two years 1978-1979. During the growing season, none of the introduced cultivars significantly outyielded the control cultivar N. F. G. perennial ryegrass, although Barmultra Italian ryegrass and Barspectra westerwolds ryegrass produced 4.6% and 2% more dry matter at Suweon, Barvestra perennial ryegrass and all other cultivars significantly lower than the control. Barmultra Italian ryegrass and Barspectra westerwolds ryegrass produced 12.7% and 3.1% more dry matter than the control cultivar N. F. G. perennial ryegrass at Cheju, but the former was only significantly higher than the control cultivar. Data were also collected on the percentage distribution of yield of ryegrasses and on susceptibility to stem rust.