• 한국작물학회지
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• 제44권2호
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• pp.122-128
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• 1999

Three rice cultivars, Namweonbyeo (early maturing), Hwaseongbyeo (medium maturing) and Dongjinbyeo (medium-late maturing) were trans-planted with 3 different seedling ages to investigate their growth habits and to improve the cultural method in paddy fields in the southern plain area of the Honam region in 1993. The 10-day old seedlings had more vigorous elongation of plant height and higher tillering ability but lower effective tiller rate, when compared with 35-day or 40-day old seedlings. Leaf area index and top dry weight were lower in 10-day old seedlings up to 40 days after transplanting but thereafter, were not different among seedlings ages. CGR was later in 10-day old seedlings, up to 30 days after transplanting, but in 30 to 40 days after transplanting, it was reversed. RGR was the highest in infant seedlings to 40 days after trans-planting, while in 50 days after transplanting, it was reversed. Panicle number and spikelet number per square meter were the highest in 40-day old seedlings, next highest in 35-day old seedlings and the lowest and in adult seedlings up to 40 days after transplanting, while spikelet number per panicle was vice versa. Milled rice yield did not vary significantly by seedling ages, but among the varieties, it was less in Hwaseongbyeo compared with Naweonbyeo and Dongjnbyeo.

• The Plant Pathology Journal
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• 제32권4호
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• pp.290-299
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• 2016

Strawberry bacterial angular leaf spot (ALS) disease, caused by Xanthomonas fragariae has become increasingly problematic in the strawberry agro-industry. ALS causes small angular water-soaked lesions to develop on the abaxial leaf surface. Studies reported optimum temperature conditions for X. fragariae are $20^{\circ}C$ and the pathogen suffers mortality above $32^{\circ}C$. However, at the nursery stage, disease symptoms have been observed under high temperature conditions. In the present study, results showed X. fragariae transmission was via infected maternal plants, precipitation, and sprinkler irrigation systems. Systemic infections were detected using X. fragariae specific primers 245A/B and 295A/B, where 300-bp and 615-bp were respectively amplified. During the nursery stage (from May to August), the pathogen was PCR detected only in maternal plants, but not in soil or irrigation water through the nursery stage. During the cultivation period, from September to March, the pathogen was detected in maternal plants, progeny, and soil, but not in water. Additionally, un-infected plants, when planted with infected plants were positive for X. fragariae via PCR at the late cultivation stage. Chemical control for X. fragariae with oxolinic acid showed 87% control effects against the disease during the nursery period, in contrast to validamycin-A, which exhibited increased efficacy against the disease during the cultivation stage (control effect 95%). To our knowledge, this is the first epidemiological study of X. fragariae in Korean strawberry fields.

• 한국자원식물학회지
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• 제11권2호
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• pp.124-130
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• 1998

It failed occasionally to take a reasonable emergence rate since tobacco (Nicotiana tabacum L.) seeds were planted on late Jan. showing lowest temperature. This experiment was done to measure the effect of GA3 (concentration ; period) , light quality (red ; white ; dark) during or after its treatment, daily irradiation hours( 0 ; 8 ; 12 ;16) and germination termperature (20 or 10 $^{\circ}C$ ocnstant ; 20/1$0^{\circ}C$ alternating) on the germination rate. Red and white light given during grmination showed no differences between the other daily irradiation hours except that 8 hours red light delayed germination although their 12 hours irradiation had the gratest rate. The rate was increased with increased concentration to GA3 0.01 mM or increased imbibition period to 3 days although the rate of cv. NC 82 was less than that of cv. Burley 21 in the case of dark imbibition of GA3 but daily 12 hours irradiation during germination. Light quality forced during GA3 imbibition eliminated such effect of GA3 shown in the darkness so that only light quality pretreatment and termperature during germinition were affected on the rate. The germination rate of thecultivars was decreased in the order of red, white light, darkness meaning that it was highly influenced by the light quality during GA3 treatment. Regardless of GA3 or light quality treatment,on the other hand, the rate was greater in 20 $^{\circ}C$ constat than 1$0^{\circ}C$ constant and 20/1$0^{\circ}C$ alternating germination temperature having similar germinative patterns.

• 농업과학연구
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• 제45권2호
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• pp.143-153
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• 2018

Soil characteristics along with various container lengths have an important role in the early survival rate and growth of seedlings by influencing the seedling quality. This experiment was conducted to investigate the effect of container length and different soil mixtures on the growth of poplar in a greenhouse. Two types of soil, homogeneous vs. heterogeneous, were used along with two container lengths (30 vs. 60 cm). The heterogeneous soil was made by dividing 50% vermiculite from a mixture of 25% vermicompost and 25% nursery soil in volume. For the homogeneous soil, the above three soil types were mixed together. Populus euramericana clone cuttings were planted in late April, and then, the growth height, root collar diameter (RCD) and biomass were measured in August. The height of the poplar was not significantly affected by container length and soil type, but the RCD was significantly affected by soil type. Leaf and root biomass was higher at the long container than at the short container for both soil treatments, but stem biomass was lower at the heterogeneous soil than at the homogeneous soil treatment. Root to shoot biomass ratio was higher at the heterogeneous soil treatment than at the homogeneous soil treatment by 12%. In conclusion, heterogeneous soil along with a long container is suitable to increase the carbon allocation into the root.

• 한국자원식물학회지
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• 제15권3호
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• pp.285-292
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• 2002

도입 마(Dioscorea alate L.) 계통 중 품질이 우수하고 이 용 가치가 기대되는 열대산 마(D. alata)를 우리나라에서 재배 시 그 가능성과 제 기관의 생육특성을 밝히기 위하여 실시하였다 D. alata. 및 D. opposita의 생육패턴 및 수량성을 비교 도입 재배 가능성을 시험하였다. 1. 4월 하순에 정식한 마의 지상부는 70일까지는 완만한 생육을 보였으나, 그후에 급격히 생장하여, 200일 이후 지상부의 하부가 낙엽지며 감소하였다. 생육은 D. atara, 단마 순이였다. 2. 도입마(D. alate)의 형성은 정식 50일 정도에서 일어났으나, 그 후 비대생장이 늦어서 150일 이후에 급격 히 비대하였다. 3. D. alata(도입마)의 일반성분은 D. opposita(단가) 보다 단백질, 섬유, 지방의 함량이 낮았다. 4. D. alata의 경도를 보면 2696.2로 D. opposita 4946.9 보다 약 2배정도 낮고, 색도 중 명도(L)는 D. alata가 73.99으로 D. opposite 보다 높았다.

• 한국작물학회지
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• 제55권2호
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• pp.91-97
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• 2010

The growth, yield and chemical properties of waxy corn $Sonjajang{\times}KNU-7$ and $Asan{\times}KNU-7$ planted in different dates and mulch types in a converted paddy field was investigated. Experiment was carried out in a randomized complete block design in a split split-plot arrangement with four replications. Planting dates (D) [May 16 (D1, early), June 1 (D2, middle), June 6 (D3, late)] represented main plots, plastic mulch (M) [(BM, black mulch; TM, transparent mulch)] for subplots while waxy corn crosses [$Sonjajang{\times}KNU-7$ (‘Sonja’) and $Asan{\times}KNU-7$ (‘Asan’)] for sub-subplots. Results showed that D had a significant effect on growth characters except emergence, ear quality except ear diameter, and yield whereas M showed significant effect on growth characters only. Superior growth and ear quality performance were recorded in D1 and BM. In terms of crosses, ‘Sonja’ had better growth performance than ‘Asan’ regardless of D and M, but performed better at D1 and BM. Highest yield was obtained in D1 for BM (2,131 kg $10a^{-1}$) and TM (1,655 kg $10a^{-1}$) but no significant difference in the yield across V was recorded. In terms of starch and sugar contents, a decreasing trend was observed from D1 to D3 regardless of M and V.

• 한국유기농업학회지
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• 제10권4호
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• pp.69-78
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• 2002

춘작 재배시 가공용 감자 품종의 품질 요인을 분석하고 저장중 glucose 및 sucrose 함량과 chip color의 변화를 알기 위해하여 99년 4월 1일부터 7월 10일까지 재배한 감자 품종을 104일 동안 저장하여 춘작 재배에 가장 좋은 품질을 나타내는 품종 및 요인을 밝혀내기 위한 조사 결과는 다음과 같다. 1. 생육 중 잎의 질소 농도는 생식 행장 초기와 괴경 성숙 단계인 개화 말기에 잎의 질소 농도가 급격히 낮아지는 경향이 있었다. 2. 생육중 잎의 K+ 농도는 종생종은 70일 만생종인 snowden은 90일부터 높게 나타나 약 20일간의 차이를 보였다. 3. Snowden 품종은 춘작재배시 110일 이상 수확 일수 확보가 어려워 춘작 재배 품종으로는 부적합한 것으로 나타났다. 4. Solid 함량과 sugar 함량은 chip color에 많은 영향을 주었으며, solid가 높을수록 sugar 함량이 낮고 저장 중품질의 변화가 적었다.

• Journal of Animal Science and Technology
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• 제61권1호
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• pp.18-27
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• 2019

With South Korea's limited capability of feed production because of its relatively small cultivable area, the country is pushed to depend on foreign feed imports despite the immensely fluctuating price of corn. Hence, intensive efforts to increase the total cultivable area in Korea like extending of farming to mountainous area is being practiced. Corn was planted in Goesan County, a mountainous area in the country. Grain and stover were harvested separately in three harvest periods: early-harvest (Aug 8), mid-harvest (Aug 18), and late-harvest (Aug 28). The nutrient composition such as dry matter (DM), crude protein (CP), crude fat (EE), organic matter (OM), neutral detergent fiber (NDF), acid detergent fiber (ADF), and non-fibrous carbohydrates (NFC) was determined after harvest. Effective degradability (ED) of the major nutrients (DM, NDF, ADF, and CP) were measured through in vitro fermentation of rumen fluid from Hanwoo (Korean cattle). pH, ammonia-N concentration, volatile fatty acid (VFA) concentration, and gas production were periodically measured at 0, 3, 6, 12, 24, 48, and 72 h. Corn grain showed higher nutrient content and ED than stover. It also had higher gas production but its pH, ammonia-N, and total VFA concentration were lower than corn stover. The best nutrient composition of corn grain was observed in early-harvest (high CP, EE, NDF, OM, NFC, and low ADF). Early-harvest of corn grain also had high effective degradability of dry matter (EDDM), effective degradability of neutral detergent fiber (EDNDF), effective degradability of acid detergent fiber (EDADF), and total VFA concentration. On the other hand, the best nutrient composition of stover was observed in mid-harvest (high DM, CP, NDF, and low ADF). EDDM, EDNDF, and EDADF were pronounced in early-harvest and mid-harvest of stover but the latter showed high total VFA concentration. Hence, early and mid-harvested corn stover and grain in a mountainous area preserved their nutrients, which led to the effective degradation of major nutrients and high VFA production.

• 한국농촌건축학회논문집
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• 제24권4호
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• pp.125-132
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• 2022

It can be seen that Traditional house of Jeong Si-yeong is located in a place where Saenggi(good energy), which is important in Pungsu(Feng Shui), can be gathered and that energy can be properly maintained. According to the theory of feng shui, a place that is not easily exposed by the surrounding mountains and is well protected by the strong wind was selected, and the main room was placed on the south side so that the sunlight was adequate while facing the north, so that you can live a comfortable life for a long time. Located on such a relatively well-hidden site, it is a location that can cope well with the invasion of Japanese invaders through the sea in the past, and even today, it is seen as a reasonable base that can be properly protected from strong sea winds in reality. On the other hand, if we look at the Hyungguk theory, it was a house built in the late Joseon Dynasty, and we could see the hidden hopes of the nobles at the time. The mountain behind the house is a haebok-type with a crab lying on the seashore, and what the crab symbolizes is the past national exam for official. Considering that the name of the place where the house is located is also Oyat(cucumber tree)-ri, where many cucumber trees closely related to the royal family of the Joseon Dynasty were planted, it seems that the family wished for prosperity by producing many Sadaebu(upper class gentry) in the past and forming a good relationship with the royal family.

• 원예과학기술지
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• 제19권4호
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• pp.488-494
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• 2001

95-98년에 걸쳐 대구지방에서 '여홍'을 공시하여 육묘하고 9월 중순 24cm 플라스틱 포트에 정식하여 노지재배 관리하였다. 9월 하순부터 다음해 1월 말까지 5일 간격으로 전조온실에 딸기를 입실재배하면서 휴면최심기, 반휴면 상태의 초형을 나타내는 보온개시기, 노지포장의 초상온도 측정치로부터 '여홍'의 휴면 타파 경과 시기, 저온적산시간의 기점, 생육 및 수량에 관한 조사 결과는 다음과 같다. 대구지방에서 '여홍'의 휴면이 가장 깊은 시기는 95년에는 11월 5일, 96년에는 10월 25일, 97년에는 10월 31일이였다. '여홍'이 전조온실에서 반휴면 상태의 초형을 나타낸 보온개시기는 95년도와 96년에는 11월 10일-20일, 97년에는 11월 10일-30일이었다. 휴면최심기를 기점으로 '여홍'의 휴면타파에 요하는 초상기온 $5^{\circ}C$ 이하 100-200시간의 경과시기는 96년에는 11월 16일-25일, 97년에는 11월 24일-12월 5일이었다. '여홍'의 수량은 각 연도마다 10월-11월의 보온개시에서 좋은 결과를 나타내었다. '여홍'은 전조 재배 시 촉성작형의 적응특성을 나타내었고 전조반촉성 재배 시에는 휴면최심기 기점 $5^{\circ}C$ 이하 50-150시간 경과 시에 보온 개시하는 것이 최선이라 사료되었다.