Due to climate change and the expansion of cultivation areas through the use of reclaimed land, changes in the selection of Italian ryegrass (Lolium multiflorum L.) varieties are anticipated. This study was conducted to compare the growth characteristics before overwintering, productivity, and feed value of eight Italian ryegrass varieties with different maturing stages under the same cultivation conditions. The variety ‘Lm4ho’, a medium-maturing type, showed superior growth characteristics before overwintering, including plant height, leaf length, and leaf width. The heading date was advanced in all varieties, with a greater degree of advancement observed in varieties with earlier heading dates. When harvested at the heading stage of the early-maturing types, the dry matter yield of the medium-maturing types was not significantly different from that of the early-maturing types. However, when harvested at the heading stage of the medium-maturing types, the dry matter yield was higher than that of the early-maturing types. Specifically, ‘Lm4ho’ produced 2,518 kg/ha more than ‘Kowinearly’. The late-maturing variety IR901 and the medium-maturing varieties ‘Lm4ho’ and ‘Kowinmaster’ showed statistically superior dry matter yields. In terms of forage value, including crude protein (CP), total digestible nutrients (TDN), and relative feed value (RFV), the medium- and late-maturing types outperformed the early-maturing types. Notably, ‘Lm4ho’, ‘IR 901’, and ‘Hwasan 104’ were evaluated as suitable varieties for high-quality forage production. These results suggest that medium-maturing varieties may be suitable for double cropping in the central regions due to climate change. We propose that future breeding of Italian ryegrass should expand from focusing on cold tolerance and early-maturing varieties to include mediumand late-maturing varieties that consider both productivity and quality.

본 연구는 이탈리안 라이그라스를 벼 입모중 파종 후 벼 수확시기에 따른 이탈리안 라이그라스 극조생종 품종 ‘그린팜’ 의 생육특성 및 생산성을 평가하기 위해 중부지역에 위치한 천안에서 2011–2012, 2012–2013 및 2013–2014까지 3년간 수행하였다. 1. 국내육성 이탈리안 라이그라스 극조생종 ‘그린팜’을 3년 간 9월 하순에 파종 후 10일(처리 1), 20일(처리2) 및 30일(처리 3) 간격으로 3회에 나누어 벼를 수확해서 재배하였을 때, 벼 수확시기가 늦어질수록 월동 전 분얼수, 초장, 월동율 및 건물수량은 감소하는 것으로 나타났다. 2. 월동 전 분얼수는 처리 1에 비해 처리 2 및 3의 평균이 각각 32% 및 52% 감소하는 것으로 나타났다. 3. 벼 수확 지연에 따른 월동율의 경우 처리 1에 비해 처리 2 및 3은 두 처리구 모두 평균 8% 감소하였으며, 건물수량은 각각 평균 32% 및 52% 감소하였다. 4. 벼 입모중 이탈리안 라이그라스 파종 재배시험에서 출수기는 매년 다르게 나타났으며, 봄철 이탈리안 라이그라스 수확 시 초장의 차이는 유의성이 있는 차이를 보이지 않았다. 5. 논에서 입모중 파종으로 극종생 이탈리안 라이그라스 품종 그린팜을 재배할 때는 파종 후 가능한 한 빨리 벼를 수확하여 생산성을 높이는 것이 방법임을 시사한다.

본 연구는 양질 월동 사료작물의 춘파 재배시 조기수확에 따른 생산성과 재생특성을 구명하고자 국내 품종인 이탈리안 라이그라스(IRG) 조생종인 Kowinearly, 중생종인 Kowinmaster, 청보리 품종인 유연, 그리고 Kowinearly + 유연혼파 및 Kowinmaster + 유연 혼파 등 5처리를 두고, 수원 국립축산과학원에서 2009년 3월 2일에 파종하여 1차 수확은 5월 26일(Kowinearly 출수후기, Kowinmaster 출수기,

“Jojoong”, a winter wheat(Triticum aestivum L.) cultivar was developed by the National Institute of Crop Science, RDA. It was derived from the cross “Suwon272/Olgeuru//Keumkang/Suwon252” during 2002. “Jojoong” was evaluated as “Iksan360” in advance yield trial test in 2011. It was tested in the regional yield trial test between 2012 and 2014. “Jojoong” is an awned, semi-dwarf and hard winter wheat, similar to “Keumkang” (check cultivar). The heading and maturing date of “Jojoong” were earlier to “Keumkang”. “Jojoong” had lower test weight (799 g/L) and 1,000-grain weigh (35.6g) than “Keumkang” (816 g/L and 45.5g, respectively). “Jojoong” showed resistance to winter hardiness and pre-harvest sprouting, which lower withering rate on the high ridge (10.5%) and rate of pre-harvest sprouting (10.5%) than “Keumkang” (31.7 and 21.4%, respectively). “Jojoong” showed similar protein content (12.5%), SDS-sedimentation volume (43.5ml) and gluten content (8.6%) to “Keumkang” (12.9%, 58.5ml and 8.5%, respectively). It showed higher lightness (93.17) in flour color than “Keumkang” (91.95, respectively). “Jojoong” showed higher lightness (81.50) of noodle dough sheet than “Keumkang” (80.95). “Jojoong” exhibited similar hardness (3.84N) and higher springiness and cohesiveness of cooked noodles (0.94 and 0.66) compared to “Keumkang” (3.88N, 0.90, and 0.62, respectively). Average yield of “Jojoong” in the regional adaptation yield trial test was 5.09 MT/ha in upland and 5.35 MT/ha in paddy field, which was 9% and 8% higher than those of “Keumkang” (4.67 MT/ha and 4.92 MT/ha, respectively).

Effect of storage on the tree and quality of early cultivar of Citrus unshiu Marc. produced in Cheju according to harvest time were investigated. Soluble solids, acid content, flesh ratio, firmness and specific cavity of the fruits harvested at 27th of November were 12.0, 1.03%, 79.98%, 0.774kg-force, 0.912, respectively. Soluble solids, total sugar and reducing sugar were increased gradually, but acid content was decreased slightly as delayed in harvest time. Otherwise specific gravity and firmness were not shown in great during harvest time, color index(a/b) was increased sharply till late November and then remained in stationary phase. On these result, we recommend that the harvest time of early cultivar of Citrus unshiu Marc. would be during December because of wilting partly. Fully ripened-fruits harvested late, compared to ordinary harvest time, with cold storage would be kept more quality and freshness of fruits for fresh consumption than the fruits harvested early and stored at room temperature.