Abstract
Meing Jooung Kim, Ki Jun Choi *, Jong Geun Kim *, Sung Seo *, Sei Hyung Yoon *, YoungChul Lim *, Seok Ki Im, Eung Gi Kwon, Sun Sik Chang, Hyeong Cheol Kim and Tae Il KimABSTRACTThis experiment was carried out to investigate the effect of cultivar and seeding date on the wintersurvival rate, quality and DM yield of Italian ryegrass on paddy field for three years in Suwon. Seedingstarted from 30th Sep. 2003. at intervals of five days and finished 20th Oct. New varieties of Italianryegrass used in this experiment were “Kospeed”, “Kowinmaster” and “Hwasan 101”. The winter survivalaverage rate of 5th Oct. seeding plot was 89.8% and it decreased with delayed seeding date. The headingdate of “Kospeed” was 7th~13rd May, “Kowinmaster” was 16th May, but “Hwasan 101 ho” didn’t showheading until 17th May. Dry matter(DM) yields of 30th Sep. seeding plot were Kospeed 7,909kg/ha,Kowinmaster 6,398kg/ha and Hwasan 101 ho 5,204kg/ha. DM yield was decreased with delayed seedingdate. Total digestible nutrient(TDN) yield was also decreased with delayed seeding date. Crude protein(CP) content was the highest in Kospeed. seeding plot as 18.3% and in vitro dry matter digestibility(IVDMD) was not showed significant difference among seeding dates.(Keywords :Italian ryegrass, Seeding date, New variety, Yield, Over winter)
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