• 한국초지조사료학회지
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• 제14권2호
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• pp.69-75
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• 1994

This experiment was canied out to study the effect of cutting frequencies (3, 4 and 5 cuts per year) and mineral nitrogen fertilization on dry matter yields, in order to estimate optimum level of fertilizing mineral nitrogen in orchardgrass(Dacry1is glomerafa L.). The results are as follows: 1. Dry matter yields were the highest in the 1st cut at 3 cutting frequency and in the 2nd cut at 4 and 5 cutting frequencies, and they shared 49.7, 37.0 and 37.0% of annual dry matter yield respectively. 2. When only phosphorus and potassium were applied, annual dry matter yields were between 9.4 and 11.5 tons per ha and the highest yield was observed at 3 cutting frequency. 3. Dry matter yield in relation to fertilization of mineral nitrogen was highly increased when more nitrogen was applied as 360 kg per ha compared to 240 kg per ha at 3 cutting frequency. At 4 and 5 cutting frequencies, increases in dry matter yield, to large extent, were showed at 120 and 150 kg of nitrogen per ha(30 kg Nlcutlha) compared to no application of nitrogen. The efficiencies of mineral nitrogen fertilization (kg DM/kg N) were 28.0, 22.7 and 20.6 kg dry matter yields per nitrogen(kg) respectively). 4. At 4 and 5 cutting frequencies, dry matter yields were reduced when 360 kg and 300 kg of mineral nitrogen per ha(90 kg and 60 kg Nlcutlha) were applied respectively. 5. Particularly at 4 and 5 cutting frequencies of this study, maximum marginal yields reached at 129.9 kg and 148.0 kg of fertilizing mineral nitrogen per ha, and economical borden of mineral nitrogen fertilization were between 222.4 and 250.0 kg and between 244.8 and 276.8 kg respectively. At the same cutting frequencies, the highest dry matter yields were obtained at 365.4 and 433.8 kg of fertilizing mineral nitrogen respectively.

• 한국초지조사료학회지
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• 제20권1호
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• pp.1-6
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• 2000

Improvement of cold-tolerance of Italian ryegrass(Lo1ium multiflorum L.) is an important breeding objectivefor enlargement of cultivation area in Korea. To develop the cold-tolerant variety of Italian ryegrass,cold-tolerant clones survived under - 13- - 14$^{\circ}$C of minimum average air temperature in January wereselected in the area of Dun Nae, Kwangwon Province. The 5 lines of Italian ryegrass clones selected werepolycrossed for seed production. Synthetic seeds were examined on growth characters and forage productionsin Suwon from 1996 to 1998, in Unbong 1997 and in Younchun 1998, respectively. The growth charactersand forage productions of Italian ryegrass variety named as "Hwasan 101" were summarized as follow ;ltalian ryegrass variety, Hwasan 101 was tetraploid and showed semi-prostrate growth habit in autumn andwas not only dark green in leaf color and broad in flag leaf width but also excellent in leafiness. Also, itshowed low plant height at first heading date of 20th May and excellent lodging tolerance. Expecially,Hwasan 101 in all trial regions was 80 -90% of winter survivals that was higher than 60 -90% of Florida80 and Marshall varieties. Therefore we estimate that Hwasan 101 can be cultivated in regions that is higherthan -9$^{\circ}$C in minimum average air temperature and lower than 400m in sea level. In forage production ofHwasan 101, fresh weight and total digestible nutrient(TDN) yield were 66,940 and 6,551kghq and drymatter yield was 10,050kgha. In conclusion, Italian ryegrass, Hwasan 101 was medium and late maturingvariety but excellent in cold-tolerance, lodging-tolerance, leafiness, and forage production.(Key words : Italian ryegrass, Cold tolerance, New variety)ian ryegrass, Cold tolerance, New variety)

• 한국초지조사료학회지
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• 제21권2호
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• pp.89-96
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• 2001

Carbohydrate and soluble protein reserves and regrowth characteristics in response to cutting height were investigated over four regrowth cycles of turf-type perennial ryegrass(Lolium perenne L. cv. preludeII). When the plants were at the full-vegetative stage (twelve weeks-old), three sequential defoliations at 3, 6 and 9 cm above the root base were imposed at 2-week intervals. Shoot dry weight in all three treatments continuously decreased with progressing regrowth cycle and the decreasing rate was higher as cutting height was lowered. TNC (total non-structural carbohydrate) in stubble at the end of the fourth regrowth cycle in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 27%, respectively, comparing the initial content. TNC in roots also largely decreased with similar pattern in response to cutting height, whereas the absolute amount was much less compared to stubble. Soluble protein in stubble in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 57%, respectively, at the end of fourth regrowth. A significant correlations between TNC (r=0.906) or protein (r=0.879) at the fourth defoliation and dry weight of regrowing shoots at the end of fourth regrowth were observed. these results indicated that cutting height closely influences the levels of organic reserves available for new growth, and that the levels of reserves might provide a useful tool as a determinant for regrowth dynamics.

• 한국초지조사료학회지
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• 제21권4호
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• pp.259-264
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• 2001

To investigate the physiological responses to naturally occurring winter freezing stress in creeping bentgrass, changes in carbohydrates were monitored during winter period. Turf quality and leaf growth was nearly parallel with temperature fluctuation. The concentration of glucose, fructose and sucrose in both shoot and root gradually increased from November to January, and then sharply decreased until April. Sucrose was the largest pool of soluble sugars. Fructan also slightly accumulated in both shoot and roots from November to February. Fructan hydrolysis in both organs was found to be much active between February to April. Shoot contained largely higher carbohydrate content in all compounds examined than roots did. Fructan was found to be a main carbohydrate storage form, showing the highest concentration (176.7 and 126.7 mg g-' DW for shoot and root in February). The depolymerization of fructan from February coincided with the high declines in mono- and disaccharide. These results suggest that the accumulation of non-structural carbohydrate until January could be associated with freezing tolerance, and the active decrease from February with shoot regrowth.

• 한국초지조사료학회지
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• 제21권4호
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• pp.181-190
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• 2001

This study was conducted to investigate the effect of swine liquid manure(SLM) and phosphorus fertilizer from September, 1998 to July, 1999 on the soil fertility on Italian ryegrass field, Cheju volcanic ash soil. pH(lst investigated), Mg (2nd investigated) and Cu content (2nd investigated) on soil grown by Italian ryegrass were significantly increased by an increase of fertilizer P(P

• 한국초지조사료학회지
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• 제13권3호
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• pp.170-176
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• 1993

이탈리안 라이그라수(Lolium muliflorum Lam.)의 원형질체 분리 및 생존성에 영향을 미치는 몇가지 요인들에 대하여 조사한 바 다음과 같은 결과를 얻었다. 성숙배. 미숙배 및 유종에 있어서 분화력이 높이 캘러스 유기는 4^{\circ}C.$에서 7일간 저온처리와 기본배지에 $AgNO_3$ 5mg/을 첨가한 것이 효과적이었다. 캘러스로부터의 재분화는 BAP 0.2mg/l와 2,4-D 2mg/l의 조합에서 가장 좋았다. 유종에서 유기되 현탁배양 세포를 액체배지에서 5일 간 진탕배양한 후 효소(4% cellulase R10, 2% macerozyme, 2% pectinase)와 삼투압 조절제인 0.6M mannitol을 첨가한 용액에서 생존율이 높은 원형질체를 얻었다. 그리고원형질체는 KM8P배지의 agarose 고체배지에서 헤포분열과 미세포괴가 이루어졌다.

• 한국초지조사료학회지
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• 제3권2호
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• pp.92-99
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• 1983

재료(材料)의 예건수준(豫乾水準)에 따른 건물함량(乾物含量)이 사일리지 품질(品質)에 미치는 影響(影響)을 알고져 1981년(年) 11월(月) 11일(日)에 호밀과 이탈리안라이그라스를 수확하였다. 예건(豫乾)에 의하여 재료(材料)의 건물함량(乾物含量)을 15.8%에서 53.2%까지 4수준(水準)으로 조절하였으며 사일리지는 폴리에틸렌필름봉지에 넣어 실온에 저장하였다. 1. 유기산(有機酸)의 함량(含量)은 재료(材料)의 건물함량(乾物含量)이 증가(增加)됨에 따라 감소(減少)하였으나 총산에 대한 유산(乳酸)은 증가(增加)하였다. 2. 건물손실(乾物損失)은 재료(材料)의 건물함량(乾物含量)이 증가(增加)함에 따라 감소(減少)하였다. 3. 사일리지의 품질(品質)은 건물함량(乾物含量)이 증가(增加)함에 따라 양호(良好)하였다. 4. 암모니아태질소는 건물함량(乾物含量)이 증가(增加)함에 따라 감소(減少)했다. 5. Invitro 건물소화율(乾物消化率)에는 건물함량(乾物含量)에 의한 차(差)가 없었다.

• 생명과학회지
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• 제23권5호
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• pp.637-642
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• 2013

본 연구에서는 이러한 설치류 기피제로의 안전성과 친환경적인 소재를 발굴하기 위하여 향이 좋고 기능성이 풍부한 천연오일 13가지를 이용하여 설치류 기피제에 적용가능성에 대해 연구하였다. 먹이 섭취저해율과 서식지 기피활성 시험에서, 세이지(SS), 레몬그라스(CC)에서 높은 기피력을 확인하였다. 또한 설치류에 기피활성이 좋은 4가지 정유를 선발하여 8가지 Gram (-)과 Gram (+)균에 대한 항균활성을 평가한 결과 CC, CZ, SA, SS 에서 몇가지 균을 제외한 대부분의 균에 대한 항균활성을 확인하였다. 따라서 이들 오일을 이용하여 새로운 형태의 기피제로서의 개발이 가능하다.

• 한국응용곤충학회지
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• 제8권
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• pp.25-28
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• 1969

콩 탄저병균(G. glycines)의 침입전 부착기의 구조와 그 형성조건을 알기 위하여 몇 가지 접촉제 커바 그리스, 셀로판, 비닐 그리고 유지론 사용하여 본 시험을 착수하였다. G. glycines의 부착기형성에는 접촉제 커바 그라스를 덮어 Water Agar에 처리한 구에는 12시간만에 $67.7\% 부착기가 형성된 반면 대조구에는 전연 형성되지 않았다. 부착기 형성에 있어서 공시한 4가지 접촉제의 효과는 비닐이 가장 좋았고 다음이 새로판 커바그라스 및 유지의 순이었다. 온도 습도 시간이 콩잎상에서 G. glycines의 부착기형성에 미치는 효과는 본 병원균의 호적온도 및 온도범위와 같이 $25^{\circ}-30^{\circ}C,\;R.H.\; 75-100\%$이었다. 그리고 36시간 처리구에서 가장 많은 부착기가 형성되었으며, 온도 $35^{\circ}C$이상 습도 $75\%$이상, 및 5시간 처리구에서는 아주 적은 수의 부착기가 형성되었다.

• 한국초지조사료학회지
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• 제12권2호
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• pp.85-88
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• 1992

목초의 재생에 따른 칼륨(K)및 마그네슘(Mg)함량의 변화를 알아보기 위해 6가지 목초에 대해 수정액중의 $K_2O$농도를 10 ppm및 300ppm으로 하여 수경재배실험을 수행했다. 약간의 예외가 있었으나 2처리구 모두 예취회수가 늘어갈수록 목초중 칼륨함량이 낮아졌으며, 이러한 경향은 콩과보다 화본과목초에서 두드러졌다.한편 목초중 마그네슘 량은 예취회수가 많아질수록 증가했다. 제 1차 예취때 높은 칼륨함량과 낮은 마그네슘함량으로 인해 K/Mg 함량비가 가장 높았다.6종류의 목초가운데 이탈리안라이그라스의 함량비가 $K_2$O 10ppm처리구에서 가장 낮았으나, 300ppm구에서는 이와 반대로 가장 높았다. 이상의 결과로부터 다른 예취때보다 제 1차 예취때에 목초중 칼륨함량은 높고 마그네슘함량은 낮게 된다는 것과 온도가 급격하게 올라갈 때는 소량의 칼륨비료질 사용과 다량시용 사이에 K/Mg 함량비에 큰 차이가 생길 수 있음을 알았다.음을 알았다.