이탈리안 라이그라스와 청보리 춘파 재배에서 조기 수확이 수량과 사료가치 및 재생에 미치는 영향

Abstract

ABSTRACTThis study was carried out to determine the forage yield, quality, and regrowth of Italian ryegrass(IRG) and barley sown on 2 March 2009 in Suwon. The five treatments were two IRG cultivars(Kowinearly with early maturity and Kowinmaster with medium maturity), one barley cultivar(Yuyeon), and two mixtures(Kowinearly+Yuyeon and Kowinmaster+Yuyeon). The first harvest date was 26 May, which was at late heading, heading and early dough stage of Kowinearly, Kowinmaster and barley, respectively. Regrowth yield was investigated on 29 June. The heading dates of Kowinearly and Kowinmaster were 16 May and 22 May, respectively, and that of barley was 13 May. The dry matter(DM) percentage were 13.0~18.4% at first harvest, and 22.5~24.8% at regrowth in all treatments. The forage yield of barley and Kowinmaster+Yuyeon mixture at first harvest was higher than that of IRG(p<0.05), but higher regrowth yield was observed in IRG, and then IRG+barley mixtures(p<0.05). The crude protein(CP) content and in vitro DM digestibility(IVDMD) of IRG at first harvest were 16.7~17.1% and 78.3~80.4%, respectively, which were higher than those of barley(CP 12.2% and IVDMD 72.6%) and IRG+barley mixtures. The total yields of DM, CP and digestible DM were high in Kowinmaster+Yuyeon mixture as 11,628kg, 1,669kg and 8,457kg per ha, respectively. In conclusion, spring seeding of IRG+barley mixtures and/or barley were recommended when early harvest. Regrowth of IRG sown in early spring was vigorous. Mixture cultivation of IRG and barley was effective, because of forage yield and stable production, and harvest at June instead of May was desirable for forage productivity of spring sown IRG and barley.(Key words: Spring cultivation, Forage productivity, Regrowth, Early harvest, Mixture)