• 한국응용곤충학회지
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• 제50권4호
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• pp.289-293
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• 2011

파정식 초기 파총채벌레의 경제적피해허용수준을 설정하기 위하여 온실에서 파총채벌레 접종기간에 따른 파의 생육, 피해 및 수량을 조사하였다. 파 정식초기에는 파총채벌레 접종기간(즉 가해정도)에 따른 수량감소율은 5일, 10일, 15일, 20일 접종기간에서 각각 17.0%, 53.3%, 38.4%, 80.8%로 증가하였다. 파총채벌레 발생정도와 파 수량감소 관계를 구명하기 위하여 파총채벌레 누적밀도일(Cumulative Insect Days, CID)과 수량 감수량(%) 간 회귀분석을 실시한 결과 비선형식인 logistic 모형에 잘 적용되었다. 이 식으로부터 경험적인 수익한계(Gain Threshold) 5%와 통상적 상품화율(93%)를 감안한 수량 감소율 12% 수준에서 파총채벌레 경제적피해허용수준은 30 CID로 추정되었다. 또한 요방제밀도는 경제적피해수준의 80%가 되는 24 CID로 추정되었다. 본 결과는 더 개선된 모형이 개발될 때까지 파 생육초기 파총채벌레 관리에 유용하게 활용될 수 있을 것으로 판단되었다. 또한 파 노지포장에서 생육후기(정식 후 120일 접종) 파총채벌레 피해가 파 수량에 미치는 영향을 검토한 결과, 파 생육후기에는 낮은 밀도에서 오히려 수량이 증가하였고, 그 후 밀도가 더 증가함에 따라 수량이 감소하는 등 전형적인 보상적 반응(over-compensatory response)을 보였다.

• 원예과학기술지
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• 제33권1호
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• pp.11-17
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• 2015

The study was conducted to investigate the effect of rootstock on growth and early yield of stenting-propagated cut roses (Rosa hybrida Hort.) 'Pink Aurora' and 'Yellow King'. The scions, prepared as single-node cuttings, each with a five-leaflet leaf, were grafted onto cuttings of Rosa indica 'Major', Rosa multiflora 'Chille Wonye No. 1', Rosa multiflora 'K-1', or Rosa multiflora 'Burr' as the rootstock. The rootstock cuttings were removed of all leaves and buds before grafting. The base of scion and the top of rootstock were held together and simultaneously cut at a $45^{\circ}$ angle for ease of grafting. Scion-rootstock unions were stuck in rockwool cubes and placed on a misted glasshouse bench for rooting before being transplanted into a rockwool slabs for cultivation. Rooting was the greatest in the 'Pink Aurora' and 'Yellow King' grafted on the rootstock Rosa indica 'Major'. In 'Pink Aurora', stem length, stem diameter, five-leaflet leaves per stem, and stem fresh weight of the harvested cut flowers were not affected by the rootstock. The greatest total yield of 'Pink Aurora' was obtained in plants grafted onto the Rosa indica 'Major' rootstock. Overall growth of 'Yellow King' was the greatest in plants grafted onto Rosa multiflora 'Burr' rootstock, although total yield was not affected by the rootstock. These results suggest that Rosa indica 'Major' is the most effective rootstock not only for rooting, but also for early yield and growth for stenting propagation of these cut roses.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.252-252
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• 2022

Genotype-by-environment interaction (GEI) refers to the comparative response of genotypes to different environments conditions. Thus, understanding GEI is a fundamental component for selecting superior genotypes for breeding programs. The significance of utilizing early maturing cultivars not only provides flexibility in planting dates, but also serves as an effective strategy to reduce methane emission from the paddy fields. In this study, we conducted multi-environment trials (METs) to evaluate yield-related traits such as culm length, panicle length, panicle number, spikelet per plant, and thousand grain weight. A total of eighty-one Korean commercial rice cultivars categorized as early maturing cultivars, were cultivated in three regions, two planting seasons for two years. The genotype main effect plus genotype-by-environment interaction (GGE) biplot analysis of yield-related traits and grain yield explained 70.02-91.24% of genotype plus GEI variation, and exhibited various patterns of mega-environment delineation, discriminating ability, representativeness, and genotype rankings across the planting seasons and environments. Moreover, simultaneous selection using weighted average of absolute scores from the singular value decomposition (WAASB) and multi-trait stability index (MTSI) revealed six highly recommended genotypes with high stability and crop productivity. The winning genotypes under specific environment can be utilized as useful genetic materials to develop regional specialty cultivars, and recommended genotypes can be used as elite climate-resilient parents to improve yield-potential and reduce methane emission as part to accomplish carbon-neutrality.

• 한국초지조사료학회지
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• 제26권2호
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• pp.97-104
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• 2006

본 연구는 수확기에 따른 호밀 품종간의 사초생산능력을 구명하기 위하여 수행하였다. 시험구는 분할구 배치법으로 주구는 4월 20일과 4월 30일의 수확시기를, 세구는 'Kodiak', 'Koolgrazer', 'Danko', 'Homil22', 'Olhomil' 품종으로 하였다. 조기수확시의 건물 함량은 각각 17.8%로 만기수확시의 20.0% 보다 낮았으나, 조단백질 및 TDN 함량에 있어서는 만기수확시 보다 높았다. 공시품종 간에는 건물, 조단백질 및 TDN 함량에 있어서 유의적인 차이가 있었다. ADF, NDF, ADL 및 cellulose 함량은 조기수확이 만기수확시 보다 낮았으나, hemi-cellulose 함량은 조기수확이 만기수확시 보다 높았다. 공시품종 간에는 조생품종의 섬유소함량이 다른 품종에 비하여 높았다. 조기수확시의 건물, 조단백질, IVDDM 및 TDN 수량은 각각 7,839, 1,468, 6,077 및 5,128kg/ha로 만기 수확시의 11,003, 1,813, 8.032 및 6,857kg/ha 보다 낮았으며 공시품종 간에는 조생품종이 다른 품종에 비하여 높았다. 시험에서 얻어진 결론은 사초용 호밀의 수확시기를 고려할 때 수량과 사료가치를 높일 수 있는 방법은 조생호밀품종에 만기수확을 조합하는 사초생산기술에 의해서 가능하다는 것이다.

• 한국초지조사료학회지
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• 제4권1호
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• pp.18-22
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• 1983

겉뿌림 산지초지(山地草地)의 초기(初期) 관리방목(管理放牧)이 수량(收量) 및 식생(植生)에 미치는 영향을 구명(究明)코저 초고(草高) 3수준, 방목강도 2수준을 두어 시험했던 바 초고(草高) 25cm일 때 10a 당(當) 10두(頭)의 한우성우(韓牛成牛)를 방목(放牧) 시킨 C처리(處理)가 단위면적당 목초(牧草)의 수량(收量)과 식생비율(植生比率)을 증가시켰다. 이러한 결과(結果)는 예취(刈取)나 기타 다른 방법(方法)으로 경제적으로 초기(初期) 관리(管理)가 어려운 지역(地域)을 개량(改良)해 나가는데 바람직할 뿐 아니라 가축에 의한 초기관리방목(初期管理放牧)은 겉뿌림 산지초지(山地草地)의 수량(收量)과 식생(植生)을 증가시킬 수 있는 방법(方法)임을 제시하였다.

• 한국작물학회지
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• 제45권1호
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• pp.14-19
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• 2000

In order to develop an appropriate cultural practice for a newly bred 2-rowed, waxy, naked barley cultivar 'Duwonchapssalbori' in the southern region, 2 varieties, 3 seeding dates, 4 seeding rates were designed with 2 replications. The heading and maturity dates of 'Duwonchapssalbori' were' earlier than 'Saessalbori by 2-5 and 4 days, respectively. Culm length of 'Duwonchapssalbori' was 60 to 66cm with lodging resistance. Grain yields of both varieties were 4.28-4.33 ton/ha in the plot of Oct. 20 seeding, 4.11-4.18 ton in the plot of Oct. 28 seeding, and 3.7-13.89 ton/ha in the Nov. 5 seeding. Grain yield with different seeding rates highly significantly fitted with secondary polynomial equations in the plots of Oct. 20 and Oct. 28 seedings ($R^2$=0.84-0.85), showing the greatest yield with seeding rate of 140kg per ha. However, the grain yield with various seeding rates in the plot of Nov. 5 seeding showed simple linear regression ($R^2$=0.71), showing the seeding rate over 160kg in the case of later seeding to be optimal. Number of spikes per $m^2$ significantly contributed to grain yield, and fitted to simple linear regression ($R^2$=0.881-0.891), suggesting that plenty of early stands should be established at early seedling stage for high grain yield. Young spikes of 'Duwonchapssalbori' in the plot of Oct. 20 seeding elongated with linear increments since Feb. 10 (6.7mm), and showed rapid increment since March 7 (15.1mm). However, elongation of young spikes of 'Saessalbori' began from March 15 with slow increments. From these studies, the optimum seeding date and seeding rate in 'Duwonchapssalbori' were Oct. 20-28 and 140kg per ha for high grain yield in the southern regions.

• 한국초지조사료학회지
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• 제12권1호
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• pp.26-32
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• 1992

A 2-year neld study was conducted to compare the influence of harvesting datrs on agronomie characteristlcs, forage yield and quality of four winter rye (fecafe cereofe L.) cultivars at the experi-mental fold of Livestock Farm, College of Agriculture, Seoul National University, Suwon.All rye rultlvars were winter hardy. Winter more and Elbon were upright in growth and early inmaturity with tall plant height, while Korean native and Kodiak were semi-prostrate and prostrate,respectively in growth and later in maturity with shorter height.Dry matter yields of Winter more and Elbon were significantly higher those of Korean native andKodiak harvested in early In 1985 and 1986. There were no slgnincant differences in dry matter yieldof the rye cultivars harvested in late in 1985, but Winter more and Elbon were signifcantly higherforage yield than the two other cultivars harvested in late in 1986.Crude protein (CP) concentrations of Korean native and Kodiak were signifcantly higher thanthose of Winter more and Elbon harvested in both early and late in 1986.There were no significant differences in tu uifro dry matter digestibility (IVDMD) of the rye col-tivars harvested in early in 1986, but those of Korfan native and Kodiak were signiHcantly lligher thanthe two other cultivars harvested in late.CP and IVDDM yields of Winter more and Elbon were significantly higher than those of Koreannative and Kodiak harvested in early in 1986. but no signiFcant differences were round among the ryeco]tivars haryested In late.

• 한국초지조사료학회지
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• 제14권4호
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• pp.324-330
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• 1994

The objective of this study is to obtain the basic data for investigating the potentiality of continuous utili~ation (first cutting in the late fall and regrowth yield in next spring) of forage rape seeded in fall. Fresh yield and the content of nitrogenous compound in leaves and roots were measured during a growth period. Fresh yield accumulation was very low between the late fall(470kg/10a) and the early regrowth period( 1.070kg /IOa). Total nitrogen content in leaves until the wintering period was decreased from 4.71% to 3.70%. while that in roots slightly increased during this period. The highest content(4.84%) in roots was observed in the early regrowth period, and then rapidly decreased as growth advanced. Protein-N was the largest pool of nitrogenous compound in leaves and roots through entire growth period, Its content in leaves decreased until the wintering period (Feb. 4), and then increased until the bolting stage(Apr. 10). Protein-N in roots highly accumulated from the late fall(11.1mg/gDM) to the early regrowth period(l6.9mg/gDM), and then decreased until the early tlowering stage. The content of amino acid-N in leaves showed a little change with a range from 5.7 to 8.5mgIgDM during entire growth period, while that in roots rapidly decreased from early regrowth period. The content of $NO_3$-N decreased from 7.0 to 4.3mglgDM in leaves, while increased from 0.9 to 2.3mg/gDM in roots from the late fall to the wintering period. 7he content of $NH_4$-N was lower and less varillble than other nitrogen compound during entire growth period. The results clearly showed that protein-N was the main storage form and highly accumulated in roots of overwintering forage rape.

• 한국초지조사료학회지
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• 제9권2호
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• pp.82-87
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• 1989

A field experiment was carried out to determine the effects of 11 different application levels of nitrogen (N), phosphorous ($P_2O_5$) and potassium($K_2O$) fertilizer in late-autumn on the winter survival, early spring growth and dry matter(DM) yield, carbohydrate reserves (CHO-R) in stubble of grasses, and botanical composition in orchardgrass dominated existing pasture in Suwon from October, 1987 to May, 1988. Winter survival of grasses was high (ca. 90%) in all N-fertilized plots, regardless of $P_2O_5$ and $K_2O$ application, and those in zero-N and zero-NPK plots were low as 86.5% and 81.4%, respectively. Early spring growth was vigorous in N-fertilized plots. Heading rate at the fist harvest was 80-86% in all N plots, regardless of $P_2O_5$ and $K_2O$, while those in zero-N and zero-NPK plots were very low as 61% and 56%, respectively. The DM yield of first harvest was higher in the plots of N 35 kg(Site B) and N 70kg $ha^{-1}$ (Site A), regardless of $P_2O_5$ and $K_2O$ level, and those in zero-N and zero-NPK plots were very low (p < 0.05). But no significant difference of yield was observed between N 75 kg and N 105 kg. CHO-R in stubble and legumes were high in zero-N and zero-NPK plots, and low relationship was found between winter survival and CHO-R of grasses. Winter survival, early spring growth and DM yield were significantly influenced by N fertilizer. In this experiment, the optimum application level of N in late-autumn could be recommended in 35-70 kg $ha^{-1}$, and no beneficial effects were observed by $P_2O_5$ and $K_2O$ fertilizer.

• 한국초지조사료학회지
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• 제9권3호
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• pp.148-152
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• 1989

본 시험은 봄철 건물이용초지에서 이른 봄 추비처용시기가 목초의 생육과 수량 및 사료가치에 미치는 영향을 구명하고자 추비시비시기를 3월 10일, 20일, 30일, 4월 9일, 19일 및 무시비(대조구) 등 6처리를 두고 1차 수확은 출추초기(1989년 5월 9일)에, 2차 이후는 각각 지예적기에 수확하였다. 추비시용구의 목초 생육과 수량 및 사료가치는 무시비구에 비해 크게 양호하였으며, 이른 봄 추포시용시기에 따른 목초의 생육, 수량, 조필자질함량, 초필자질생산품, 실요이용율 및 소화율 등을 비교해 볼 때, 효과는 3월 30일 추비구에서 가장 좋았고, 다음이 3월 20일이었다. 본 시험의 결과로서 이른 봄 추비시용적기로 판정된 3월 20~30일까지의 개략적인 적산온도는 200~280도씨, 지중온도(10cm)는 8~10도씨 였으며, 따라서 수원지방에서 열년기상을 기준으로 한 봄철 건초이용초지이 이른 봄 추비시용적기는 4월 10~15일 경으로 생각된다.