• Journal of Ginseng Research
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• 제9권2호
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• pp.146-153
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• 1985

This study was conducted to know the effect of vinyl mulching from the sowing to germination on the seedbed for germination and production of seedling. Embryo growth was restrained with decreasing the water content in seed and stopped below 10% water content. Germination was possible over 55% water content but radicle growth was stopped at 55% water content. Ratioes of embryo / emdosperm length were about 50% at seeding time, and about 80% at just before freeing season, and the ratio was increased from the thawing season again. Vinyl mulching increased the soil water content and soil temperature. Germination rate and number of available seedling in vinyl mulching were increased 10% and 12%, respectively.

• 농업과학연구
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• 제17권1호
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• pp.18-25
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• 1990

The above results indicate that vegetable crop production using vinyl houses continously increases. However, technical support and facility improvement are still insufficent to establish a full production system. In order to improve the cultural environment in facilities for better vegetable culture, several facters should be considered. 1. Facility design and arrangement should be made to improve micro-environments for crop growth and development because direction of facility and covering materials can affect the amount of light trasmitted into vinyl houses. 2. Cultivation of several leading varieties in each crop may not provide stable production and profit especially under undesirable environmental conditions. Thus, it is required to grow not only leading varieties but also other cultivars to decrease the economic losses. 3. Crops should be carefully managed when planted in early season not to experience low temperatures which induce growth retards. Early season cultivation requires proper selection of cultivars which are resistant to low temperture. 4. Active control of micro-environment in facilities should be made via improving the ventilation and irrigation systems.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2004년도 수산관련학회 공동학술대회 발표요지집
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• pp.217-219
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• 2004

• 생물환경조절학회지
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• 제3권1호
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• pp.58-65
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• 1994

본 시험은 하절기 경제성을 고려한 효율적인 온도하강방법을 구명하고자 차광재료, fog system, 송풍등 복합적 온도하강처리에 따른 비닐하우스의 기상환경변화를 조사하여 다음과 같은 결과를 얻었다. 1. 중형하우스에서 온도하강방법에 따른 환경특성은 처리에 따라 하우스의 고온화를 상당히 효율적으로 억제하였다. 7월31일 하우스냉방처리에 따른 기온의 일중변화를 경시적으로 보면 수분의 증발잠력능력을 이용한 fog system과 은색차광 및 송풍을 혼합하여 처리할 경우 기온과 지온은 외기온에 비하여 최고 각각 1$0^{\circ}C$, 4$^{\circ}C$정도 온도하강효과가 있었으며 그 다음은 은색차광＋fog system, 은색차광＋송풍, 흑색차광＋송풍구 순이였다. 2. 하절기 가장 온도가 높은 시기인 7월20일부터 8월21일까지 하우스냉방처리에 따른 온도하강 효과를 보면 최고기온은 시험처리에 따라 온도차가 인정되며 은색차광＋fog system＋송풍구의 지상, 지표면기온은 외기온에 비하여 각각 약 8$^{\circ}C$, 7$^{\circ}C$정도 온도하강 효과가 있었다. 3. 은색차광＋송풍구와 흑색차광＋송풍구의 일사량은 청명한날 외기일사량에 비하여 각각 약 29.3%, 32.5%이였으며 흐린 날은 각각 약 27.4%, 31.8%이였다.

• 한국작물학회지
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• 제37권1호
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• pp.86-92
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• 1992

최근들어 우리나라 국민의 식품소비 형태가 점차 고급화됨에 따라 메밀의 어린 식물체와 종실은 건강 별미식품의 원료로서 수요량은 단속 증가될 전망이다. 엽채소용으로 이용되는 메밀의 어린 식물체는 30% 이상의 단백질과 500mg / 100g 이상의 Rutin과 상당한 양의 미네랄, 비타민 함유하여 단경기 재배시 녹채소의 수량은 파종량, 파종기, 재배환경 조건에 따라서 262～2,270 / 10a로 차이가 매우 컸으며 예상조수익도 52.4～183.5만원 / 10a이었다. 엽채소용 메밀의 육묘기간을 20, 25, 30일로 하였을 경우 육묘기간이 길수록 초장, 줄기의 굵기, 잎의 수와 크기가 증대되었다. 4배체품종 신주대메밀의 생체중은 2배체품종 수원재래와 신농001에 비하여 35%가 더 무거웠으며 엽육이 두껍고 잎이 커서 상품가치가 더 좋았다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.309-309
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• 2017

The experiments were carried out in open experimental field of Field Crops Research Institute, Hai Duong, Vietnam in Winter Spring seasons 2015-2016 and 2016-2017 for finding high yielding of Korean chipping potato varieties which are adaptable to Vietnam condition. Six varieties of Korean potato (G1, G2, G4, G10, B1, B2) were experimented. The control variety (G6) was Atlantic which has long been a standard chip variety. The results showed that, for a hill, there was positive correlation between number of stems and number of tubers. The hill yield also showed highly relation to the plant height and number of tubers. Even though the growth and yield of potatoes grown in the season 2016-2017 were significant higher than these of potatoes grown in the season 2015-2016, their percentages of tubers infected by scab disease were much higher. This is probably because of irregular soil moisture content at the tuber forming duration. While G1, G6 and B1 are white flesh varieties, the remaining are yellow flesh varieties. There are two shapes types among experimented varieties: oblong (G1, G10, B1) and round shape (G2, G4, G6, B2). The total yields of varieties G1, G2, B1, B2 were higher than the total yield of the control variety from 16.5-49.4% in the season 2015-2016 and from 39.8-75.6% in the season 2016-2017.

• Asian-Australasian Journal of Animal Sciences
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• 제26권3호
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• pp.401-407
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• 2013

Two experiments were conducted to determine an optimum Lys:calorie ratio (g of total dietary Lys/Mcal of DE) for growing barrows and gilts in cool and hot seasons in a commercial environment. In Exp. 1, 96 barrows and 96 gilts were randomly allocated in 1 of 4 dietary treatments (2.7, 3.0, 3.3, 3.6 g of Lys/Mcal of DE). Each treatment had 12 replicate pens with 4 pigs per pen. The experiment lasted for 34 d in the cool season (March 12th to April 15th). Diets were based on corn-wheat-soybean meal. Lys:calorie ratio were attained by adjusting the amount of corn and soybean and supplementation of crystalline Lys. Total Lys intake and available Lys intake were increased (p<.05) as dietary Lys:calorie ratio increased. The BUN concentration on d 34 for barrows, and BUN change for barrows and gilts linearly increased (p<0.05) in response to increasing dietary Lys:calorie ratio. For gilts, back fat was decreased and then increased (Quadratically, p<0.05) as increasing dietary lys:calorie ratio. Exp. 2 had a similar design as Exp. 1 with the exception that Exp. 2 was conducted in hot season (June 30th to September 11th) for 42 d. Diet of Exp. 2 was the same as Exp. 1. Total Lys intake and available Lys intake increased (p<0.05) as dietary Lys:calorie increased. On d 42, the BUN concentration increased (p<0.05) in response to the increasing dietary Lys:calorie ratio. In conclusion, dietary Lys:calorie ratio of 2.7 g of Lys/Mcal of DE could satisfy the requirement of 25 to 50 kg growing pigs. Increasing dietary Lys:calorie ratio could increase BUN concentration in growing pigs.

• Asian-Australasian Journal of Animal Sciences
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• 제10권2호
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• pp.215-222
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• 1997

Ten rice varieties were planted at two locations (lowland and highland), during the wet and dry seasons of different years. In vivo digestibility and voluntary intake of the straw, were determined in groups of fat-tail sheep, supplemented with $18g{\cdot}kg^{-0.75}$ concentrate DM, containing ~20% crude protein. Voluntary intake of digestible straw organic matter (DOMI) consistently varied from 15.2 to $20.9g{\cdot}kg^{-0.75}$ between straw varieties, averaged over locations, years and seasons, despite considerable variation between individual batches. This variation in the nutritive value of the straw was independent of straw and grain yield, so it would seem that there is scope for selection of rice varieties with straw of higher nutritive value. The variation in DOMI of straw among location of growth, year and season, was of a magnitude similar to the improvement brought about by urea-ammoniation. The in sacco degradation characteristics and digestibility of rice straw residues were superior to those of the offered straw. This can be attributed to a preference for rice straw leaves relative to stems. Averaged over location of growth, year and season, characteristics of in sacco degradation, i.e. the rate of fermentative degradation and the truly undegradable fraction, emerged as accurate predictors of the nutritive value of rice straw.

• Journal of Ecology and Environment
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• 제38권1호
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• pp.57-65
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• 2015

A natural mixed stand of Phragmites australis and Phacelurus latifolius was studied to clarify the distribution properties in a microsite in a tidal flat of Suncheon Bay. The height, density, and biomass of the shoots, as well as the biomass of the root system, were monitored for both species along with the altitude on a mound from June 2010 to October 2013. Firstly, the mean height and dry weight of both species were similar during the growth season. However, individual variations of the sizes of plants in the same species were noticeable. Secondly, the density and dry weight per unit area of P. latifolius increased, but that of P. australis decreased with the altitude on the mound. Thirdly, the root system (rhizomes and roots) of P. latifolius was mostly located in the upper layer (up to 20 cm depth), while that of P. australis was in the lower layer (over 70 cm depth) of the sediment. The roots of P. australis penetrated to the lower parts of the water table, while the roots of P. latifolius did not make contact with free water of the sediment. Fourthly, the removal of the shoot in the early growth season led to a visible reduction of biomass in the late growth season. The reduction rate was larger in P. latifolius than in P. australis. Lastly, in the area where the mound was removed, the density of P. australis increased in the first two years (2010-2011) and was highly sustained inthe last two years (2012-2013). However, the density of P. latifolius was low, and this plant was distributed at the edge of the mound only.

• Journal of Ginseng Research
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• 제5권1호
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• pp.73-84
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• 1981

Effect of environmental factors and host on the growth and outbreak of various ginseng diseases was reviewed Environmental lectors included hydrogen ion concentration, moisture content, temperature, nutrition, and microbiol populations. Age of the ginseng plants in relation to several ginseng disease occurrence was also included in order to formulate the effective control measure for ginseng diseases. Damping-off caused by Rhizoctonia, Pythium, and Phytophthora, greymold by Botrytis, sclerotinia by Scleretinia, and phytophthora blight caused by Phytophthora were usually prevalent during the early growing season of ginseng when temperature is below 20$^{\circ}C$, while anthrac se caused by Colletotrichum, alternaria blight by Alternaria, and bacterial soft rot by Erwinia were so during the latter growing season when temperature is above 25$^{\circ}C$. However, the root rot incited by Fnarium and Cylindrocarpon caused severe damages throughout the growing season. Growth range of the temperature for a pathogen was highly related to the corresponding disease outbreak. Hydrogen ion concentration was highly related to the outbreak of sclerotinia, root rot, and red rot. Most severe outbreak of those diseases where the soil acidity was pH 4.7, pH 6.5- 7.5, and pH6.0-6.5, respectively. Nitrogen content in the soil was also related to outbreak of root rot and red rot. More red rot occurred where NH,-nitrogen is above 30 ppm and more root rot obtained when excessive nitrogen fertilizer applied. Yellow necrosis apparently was related to magnesium especially its ratio with potassium or calcium content in a soil. Fusarium Population showed significant .relations to missing rate of ginseng Plants in a Implanting ginseng field, while that of total bacteria showed similar relations in all ginseng field, However, in six year old ginseng fields, the more the Streptomyces population was, the less the Fusarium obtained. Consequently, less missing rate observed in a field where Streptomyces population was high. Damping-off, root rot, Rhytophthor a blight were mose severe on the nursery and on 2-3 years old ginseng plants, whereas sclerotinia, and grey cod, alteraria blight, anthracnose were severe on 4-6 years old ginseng plants. Root rot caused by Fusarium and Erwinia, however, was also severe regardless of the age of the plants when the roots were injured. Therefore, for the effective control of ginseng root rot most careful control of the disease during the early year should be rendered.