Effect of Early Harvest on the Forage Yield, Quality and Regrowth of Italian Ryegrass and Barley Sown in Early Spring

Abstract

This 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 11,628 kg, 1,669 kg and 8,457 kg 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.

Optimum Harvest Stage of Italian Ryegrass 'Kowinearly' According to One and Two Harvests During Spring Season

“…일반적으로 IRG의 수확적기는 출수기에서 개화기로(RDA, 2011), Choi et al (2011)은 국내 개발 만생종 '화산 101호' 의 생육단계별 수량과 사료가치를 고려한 수확적기는 출수 80% 정도인 수전기에서 개화기로 보고한 바 있다. 그렇지 만 최근 영농현장에서 숙기가 빨라 선호도가 높은 조생종 IRG에 대한 생육시기별 사료가치와 수확적기 구명 연구는 거의 없는 편이다(Seo et al, 2011).…”

“…Seo et al, 2011)과 비슷한 것으로 나타났다. 이와 같이 생육이 예년에 비해 늦어진 것은 2010년도 봄철 기상이 잦은 강우와 일조 부족으로 경 과하였기 때문으로 추정된다(Table 1).…”