• Title/Summary/Keyword: Cultivation region

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Natural Environment of Silk Road (실크로드의 자연환경)

  • Son, Myoung-Won
    • Journal of the Korean association of regional geographers
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    • v.11 no.1
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    • pp.29-39
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    • 2005
  • Silk Road is the term involving all traffic roads connecting the East to the West, and ancient Korean culture has became globalized through Silk Road. In this paper, natural environment of Silk Road is considered as fundamental data in order to understand the Western culture introduced through Silk Road. Silk Road region is classified into Loess Plateau district; arid basin district; and high mountains district; Hesi Corridor(河西回廊) is the transition zone that the southeastern part of $W{\breve{u}}w{\bar{e}}i$(武威) is Loess Plateau district; other northwestern part is arid basin district Loess Plateau district, composed of homogeneous fines, has experienced dramatic soil loss by bringing under cultivation. At recent times, reforestation and construction of check-dam have been in operation to cope with this problems, Arid basin district; although at midlatitude, is desert climate because it is far from the ocean and is surrounded by high mountains. Oasis of Hesi Corridor is continuous linearly, but that of arid basin district is sporadic. In $H{\bar{a}}mi$ and $T{\breve{u}}l{\breve{u}}f{\bar{a}}n$(吐魯番) fruit-growing using karez flourishes, And glacier of $Ti{\bar{a}}nshian$(天山) Mts. and $Q{\bar{i}}lian$(祁連) Mts. is very important to arid basin district because of supplying water resource. In the tundra zone surrounding alpine glacier, are distributed widely solifluction lobes and earth hummocks.

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Phylogenetic Analysis of Downy Mildew Caused by Peronospora destructor and a Method of Detection by PCR (양파 노균병균 Peronospora destructor의 분자계통학적 유연관계 분석과 PCR 검출기술 개발)

  • Back, Chang-Gi;Hwang, Sun-Kyung;Park, Mi jeong;Kwon, Young-Seok;Jung, Hee-Young;Park, Jong-Han
    • The Korean Journal of Mycology
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    • v.45 no.4
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    • pp.386-393
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    • 2017
  • Onion downy mildew, caused by Peronospora destructor, is a major disease in onion cultivation areas in Korea. The causal fungi were collected and analyzed based on sequence similarity and molecular phylogenetic relationships of multi-gene sequences, including the internal transcribed spacer (ITS) region. All isolates from Changnyeong-gun, Hamyang-gun, and Hapcheon-gun in Gyeongnam province, and Muan-gun, Haenam-gun, and Sinan-gun in Jeonnam province were identical in the four types of gene sequences, indicating they were genetically the same strains. In this study, a PCR method was developed based on the ITS gene sequences to amplify the specific DNA fragment for P. destructor only. The detection limit of was total genomic DNA of the P. destructor and the plant $0.7ng/{\mu}L$. Therefore, the developed PCR method could be used to detect P. destructor effectively from symptomless onion leaves.

Use of Geographical Information Systems in Analyzing Large Area Distribution and Dispersal of Rice Insects in South Korea (벼 해충의 분포와 분산의 해석에 있어서 지리정보처리체계의 활용)

  • ;K. L. Heong
    • Korean journal of applied entomology
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    • v.32 no.3
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    • pp.307-316
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    • 1993
  • The potential of using GIS in analyzing pest surveillance data was explored. The Spatial Analysis System (SPANS) was used to construct a spatial data base to study pest distributions using pest surveillance data collected from 152 stations in South Korea. The annual spatIal distributions of the striped rice borer(SRB), Chdo suppressalis, showed that high densities started to expand in the early 1980s, reaching a peak in 1988. The pattern change appears to be related to cultivation of japonica and indica-japonica hybrid varieties in South Korea. Japo7l!ca varieties have longer duration resulting in the SRB haVlng more time to mature and hibernate in wmter. The locus of SRB spread appears to be located in the mid-west region near lri, Chun~ Buk Province. High brown planthopper (BPH) populations in South Korea are often related to the early immigration and temperature. The simulated distribution of PPH densities in September using these two factors was compared with the actual distribution obtained using 1990 data. The two density maps corresponded closely excepL for differences in the south eastern valley. By overlaying the simulated map layer with the elevation and rice area maps, more specific BPH risk zones could be identified.

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Characteristics of the soil loss and soil salinity of upland soil in saemangeum reclaimed land in western South Korea

  • Kim, Young Joo;Lee, Su Hwan;Ryu, Jin Hee;Oh, Yang Yeol;Lee, Jeong Tae
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.316-316
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    • 2017
  • The objective of this study is to estimate quantitatively soil salinity and soil loss at upland soils in agriculture land region in Saemangeum reclaimed land on the south Korea coasts. Soil loss and soil salinity are the most critical problem at reclaimed tidal saline soil in Korea. The several thematic maps of research area such as land cover map, topographic and soil maps, together with tabular precipitation data used for soil erosion and soil salinity calculation. Meteorological data were measured directly as air temperature, wind speed, solar radiation, and precipitation. The experiment was conducted 2% sloped lysimeter ($5.0m{\times}20.0m$) with 14 treatments and it were separated by low salinity division (LSD) and high salinity division (HSD) install. The cation content in ground water increased during time course, but in the case of land surface water the content was variable, and $K^+$ was lower than that of $Na^+$ and $Mg^{2+}$. At the LSD under rainproof condition, the salinity was directly proportional to soil water content, but at the HSD the tendency was no reversed. In condition of rainproof, the amount of soil salinity was higher at the HSD than at the LSD. Positive correlation was obtained between the soil water content and available phosphorous content at the rainfall division, but there was no significance at the surface soil of the rainproof division. Sodium adsorption ratio and anion contents in soil were repressed in the order of vinyl-mulching > non-mulching > bare field. According to the result of analyzing soil loss, soil loss occurred in a vinyl-mulching, a non-mulching and a bare field in size order, and also approximately 11.2 ton/ha soil loss happened on the reclaimed land area. The average soil loss amount by the unit area takes place in a non-mulching and bare field a lot. Our results indicate that soluble salt control and soil erosion are critical at reclaimed tidal saline soil and the results can provide some useful information for deciding management plans to reduce soil loss and salt damage for stable crop production and diverse utilization or cultivation could be one of the management options to alleviate salt damage at reclaimed tidal saline soil in Korea.

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Occurrence of Jujube Witches' Broom Disease and Control Efficacy of Trunk Injection with Oxytetracycline in Boeun Area from 2018 to 2019 (2018-2019년 보은지역 대추나무 빗자루병 발생 및 옥시테트라사이클린 수간주사 방제 효과)

  • Kang, Hyo-Jung;Choe, Seonghui;Lee, Kyeong Hee;Park, Heesoon;Oh, Ha Kyung;Lee, Seongkyun;Shin, Hyunman
    • Research in Plant Disease
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    • v.26 no.1
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    • pp.19-28
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    • 2020
  • Jujube witches' broom (JWB) disease is a high-risk plant disease that occurred on and devastated jujube orchards throughout South Korea in the 1950s. Recently, as the jujube cultivation area has been significantly increased nationwide, we investigated the disease in jujube orchards in the Boeun region to obtain basic information for proactively evaluating the risk of JWB outbreaks from 2017 to 2019. A field trial was conducted to evaluate the effect of the trunk injection of Sungbocycline (a. i. oxytetracycline calcium alkyl trimethyl ammonium 17%, OTC). The incidence of JWB disease was very low in Boeun, but it was gradually increased mainly in the area and on the farms where it had occurred previously. The trunk injection with OTC was most effective in the early stages of growth. However, even though the trees were treated with OTC, disease symptoms appeared in other healthy branches in severely affected trees. When the tree was first injected with OTC in June, the control efficacy of second injection was higher one month after the first injection than five months. These results suggest that early diagnosis based on various symptoms and early control based on them can be very effective in preventing JWB disease in advance and increasing control efficacy.

Nutrient Value and Yield Response of Forage Crop Cultivated in Reclaimed Tidal Land Soil Using Anaerobic Liquid Fertilizer (간척지 토양에서 혐기소화액비 시용에 따른 사료작물의 생산성과 사료가치 평가)

  • Shin, Kook-Sik;Hwang, Won-Jae;Lee, Seung-Heon;Kim, Chang-Hyun;Yoon, Young-Man
    • Korean Journal of Organic Agriculture
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    • v.20 no.4
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    • pp.669-685
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    • 2012
  • This study was carried out to investigate the nutrient value and yield response of corn, barley, and sudangrass by the application of anaerobic liquid fertilizer in two tidal land soil in order to design the resource recycling agricultural system between livestock and forage crop cultivation in a environment friendly agricultural region. Forage crop yields at reclaimed tidal soil during were at the level of 64~76% comparing with forage crop yields at upland soil in the cropping system of corn, barley, and sudangrass. And yields of forage crops were in the order of barley > corn > sudangrass in the cultivated cropping system for 2 year. Relative feed values (RFVs) of forage crops were 88%~106% for corn, 90%~111% for barley, and 91%~113% for sudangrass, and the carrying capacity of beef cattle (Hanwoo) was 5.8~8.6 head/year/ha for the corn-barley cropping system of one year, and 4.8~6.7 head/year/ha for the barley-sudangrass cropping system of one year. Also, carrying capacity of beef cattle (Hanwoo) was highest in the application level of anaerobic liquid fertilizer 200%.

Comparison of Growth Characteristics, Forage Production and Feed Values of Bermudagrass, Teffgrass and Kleingrass as Annual Forage Crop in Summer (여름철 버뮤다그라스, 클라인그라스 및 테프그라스의 생육특성, 생산성 및 사료가치 비교)

  • Park, Hyung Soo;Choi, Ki Choon;Kim, Ji Hea;Lee, Sang-Hoon;Jung, Jong Seong
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.35 no.1
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    • pp.36-42
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    • 2015
  • This study was conducted from 2013 to 2014 to explore the feasibility of the cultivation of warm-season grass as an annual Korean forage crop, while concurrently evaluating the characteristics and forage production of warm-season grass in Korea. The experimental design was a randomized block design (RBD) with three replications. Five bermudagrass [Cynodon dactylon (L.) Pers.] cultivars, two teffgrass (Paspalum notatum Flugge) cultivars, and a Kleingrass [Panicum coloratum L.] cultivar were compared for forage production and quality in the middle region of Korea. After seeding, the numbers of days until seedling emergence for bermudagrass and kleingrass were observed at approximately day 11 and day 12, respectively. The heading dates of teffgrass and kleingrass were on July 12 and July 26, respectively. The dry matter (DM) yield of bermudagrass Tifton 85 was usually greater than the other entries. The crude protein content (CPC) and total digestibility nutrient (TDN) for the teffgrass cultivars were usually greater than the other entries at all study sites. The acid detergent fiber (ADF) and in vitro DM digestibility (IVDMD) were similar across all cultivars.

Development and Application of Detection Method for Aphanizomenon flos-aquae not Usable as a Food Materials in Korea (식품 중 사용금지 원료인 Aphanizomenon flos-aquae 검출법 개발 및 응용)

  • Park, Yong-Chjun;Shin, Seung-Jung;Lee, Ho-Yeon;Kim, Yong-Sang;Kim, Mi-Ra;Lee, Sang-Jae;Lee, Hwa-Jung
    • Journal of Food Hygiene and Safety
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    • v.28 no.2
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    • pp.188-193
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    • 2013
  • Anatoxin-a, saxitoxin and neosaxitoxin are produced by Aphanizomenon flos-aquae that is a sort of the cyanobacteria phylum. Therefore, it is not permitted for food materials in Korea. Traditionally, the classification of cyanobacteria has been based on morphological characters such as trichome width, cell size, division planes, shape, and the presence of character such as gas vacuole. But, some diagnostic features, such as gas vacuole or akinetes, can show variation with different environmental or growth conditions and even be lost during cultivation. Therefore, we developed detection method for functional foods containing Aph. flos-aquae by PCR. To design the primer, 16S rRNA region of Aph. flos-aquae, Spirulina laxissima, and Spirulina spp. registered in the GeneBank (www.ncbi.nlm.nih.gov) have been used and for comparative analysis, BioEdit ver. 7.0.9.0. was used. As a result, we was design AFA-F1/AFA-R1 (363 bp) primer for the differentiation Aph. flos-aquae from chlorella, spirulina, green tea, and spinach. Also, it could be distinguished chlorella and spirulina products those are made to contain 1% Aph. flos-aquae.

Growth Characteristics and Yield of the Three Species of Genus Angelica (당귀의 종별 생육특성 및 생산성 비교)

  • Yu, Hong-Seob;Park, Chung-Heon;Park, Chun-Geon;Kim, Young-Guk;Park, Hee-Woon;Seong, Nak-Sul
    • Korean Journal of Medicinal Crop Science
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    • v.12 no.1
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    • pp.43-46
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    • 2004
  • In genus Angelica, three species have been used and cultivated for medicinal material in orient, A. gigas in Korea, acutiloba in Japan and sinensis in China. A. gigas (Chamdangui) is different from A. acutiloba or A. sinensis in the contents chemical components and their efficacious. In Korea, in particular, A. acutiloba has been cultivated in a small acreage from several decades ago, and recently A. sinensis has been trying to cultivate. A trial of adaptation and cultivation of the three species was performed in different altitudinal regions such as Suwon (50 m of sea level), Jinbu (500 m of sea level) and Taebak (700 m of sea level). A. gigas and acutiloba grew and produced roots successfully at all locations, but A. sinensis could grow only at high altitudinal region, Taebaek. A. sinensis survived 70.3% at Taebaek, but only 45.2% at Jinbu and 3.6% at Suwon. The dry root yield of A. sinensis was as low as 1,600 kg/ha at Taebaek and 1,270 kg/ha at Jinbu comparing farmers' average root yield of A. gigas, 3,000 kg/ha however, no root could be harvested at Suwon. The results, showed it was that A. sinensis could not grow at low altitudinal plane area except high altitude area in Korea. Even though it could grow, the root yield was too low to support the income.

Physicochemical properties, bioactive composition, and antioxidant activity of different coffee beans dependent on the cultivation region (원산지에 따른 커피의 이화학적 특성, 생리활성 성분 및 산화방지 활성)

  • Lee, Kyung Soo;Kim, Ja Min;Yoon, Kyung Young
    • Korean Journal of Food Science and Technology
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    • v.49 no.5
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    • pp.474-479
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    • 2017
  • Five types of coffee bean, which are usually imported and consumed in Korea, were roasted at $250^{\circ}C$ for 15 min and extracted by using a filter coffee machine. The physicochemical properties, functional components, and radical scavenging activity of coffee bean extracts were investigated. The pH of extract was the highest among the extracts and the soluble solid contents of extracts were $0.9-1.0^{\circ}Bx$. The acidity of the extracts was in the range from 0.46-0.55%, which was not significantly different from the control. Indonesian coffee bean extract showed the highest brown color intensity and contained the highest amounts of caffeine and chlorogenic acid. The highest total polyphenol content was found in Kenyan coffee bean extract. Coffee bean extracts from Indonesia and Kenya showed significantly higher radical scavenging activities than the other extracts. This study showed that coffee bean extracts from Indonesia and Kenya contained a large number of bioactive compounds and high antioxidant activity.