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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Agricultural Science
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Journal DOI :
CNU Journal of Agricultural Science
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Volume & Issues
Volume 38, Issue 4 - Dec 2011
Volume 38, Issue 3 - Sep 2011
Volume 38, Issue 2 - Jun 2011
Volume 38, Issue 1 - Mar 2011
Selecting the target year
Herbicidal activity and crop injury of aqueous extracts of sorghum leaves
Won, Ok-Jae ; Uddin, Md. Romij ; Pyon, Jong-Yeong ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 191~198
Herbicidal effects and crop selectivity of aqueous leaf extracts of sorghum (Sorghum bicolor L.) were evaluated against several weed species for developing sustainable weed management in organic farming. Aqueous sorghum leaf extracts were highly phytotoxic to different weed species. No broadleaf weeds were germinated in the concentration of 5 fold or higher concentrated sorghum leaf extracts and 90% of seed germination was inhibited within that range in grass species. Sorghum leaf extracts strongly inhibited the growth of different weeds by pre-emergence and foliar applications in greenhouse condition. Foliar application of sorghum leaf extracts had a higher inhibitory effect than the pre-emergence application. Broadleaf weed species were more susceptible than grasses to the application of sorghum leaf extract in foliar applications than grasses. Galium spurium, Erigeron candensis, and Rumex japonicus were completely killed at the highest concentrated sorghum leaf extract both in pre-emergence and foliar application. Most broadleaf weed species were inhibited more than 80% at pre-emergence application at 50 fold concentrated sorghum leaf extract. G. spurium, E. candensis, R. japonicus, Eclipta alba, Plantago asiatica and Portulaca oleraeea were most susceptible to sorghum leaf extract in foliar application. Growth of most broad leaf weed species was suppressed by greater than 90% at 50 fold concentrated sorghum leaf extract. Most crop species were tolerant to sorghum leaf extract but shoot growth was slightly reduced by the application of 40~50 fold concentrated extracts, Sorghum leaf extract may used to control weeds in organic fanning without affecting the growth of crop.
Mapping QTLs for drought tolerance using an introgression line population from a cross between Ilpumbyeo and Moroberekan in rice
Kang, Ju-Won ; Ju, Hong-Guang ; Yang, Paul ; Ahn, Sang-Nag ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 199~204
This study was conducted to map quantitative trait loci (QTLs) related to drought stress tolerance. An introgression line population derived from a cross, "Ilpum" / "Moroberekan" was used in this study.
plants were backcrossed three times to Ilpum to produce
plants. These plants were advanced by selfing for four generation and a total of 117
introgression lines were developed. These lines were evaluated for percent seed set and spikelets per panicle under the control (field) and drought condition. To identify QTLs related to drought tolerance, 134 SSR markers showing polymorph isms between the parents were genotyped for the 117
lines. A total of 6 QTLs associated with drought stress were detected on chromosomes 1, 3, 4, 7 and 10. These include two QTLs for phenotypic acceptability, two QTLs for percent seed set (
= 19.0 - 20.9%), and two QTLs for spikelets per panicle (
= 22.3 - 23.10%). The Moroberekan alleles at three loci contributed the positive effect for drought tolerance. The SSR markers linked to drought stress tolerance can not only facilitate the selection of valuable genes from Moroberekan, but also allow identification of lines with drought tolerance.
Marketing of cleaned fresh ginseng and pre-packaging fumigation of 2-phenylethyl alcohol on ginseng storability
Kim, Sun-Ik ; Sung, Bong-Jae ; Kim, Hyeon-Ho ; Hwang, Yong-Soo ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 205~212
The potential factors for quality loss of cleaned fresh ginseng and technology to be associated with the improvement of marketability through pre-packaging fumigation were examined. Major microorganisms isolated from fresh ginseng included Botrytis cinerea, and Erwinia sp. Others such as Cylindrocarpon sp., Fusarium spp., Pennicilium spp., Bacillus spp. were also found at relatively low frequency. The bacterial density of vacuum packaged fresh ginseng rapidly increased during simulated marketing. Little correlation between bacterial growth and package swelling was found. In order to improve packaging method of fresh ginseng, pre-packaging treatment of 2-phenylethyl alcohol (PE, 100 uL/L, 4 hr) was examined. The fumigation treatment effectively inhibited the growth of bacteria density and also effective on keeping firmness of ginseng root, especially in cortical portion. The internal gas compositions of plastic container packaged for ginseng were approximately ranged between 6 to 8%
and 3 to 4%
level of fumigation treatment was lower than control whereas
level was higher. The upsurge of ethylene evolution I day after simulated marketing was found only in fumigation treatment but it returned to ordinary level at day 2. The sucrose content of 2-PE treatment was significantly reduced at 5 days after simulated marketing but reducing sugars like glucose and fructose remained at higher level. The difference in sugar levels was reduced after 10 days of simulated marketing. The decay of fresh ginseng began at the lateral or fine root, which is weak to physical damage, in general. The epidermis was more damaged. Plastic container packaging with PE fumigation could be an alternative to vacuum packaging, which allows an aerobic environment and prevents anaerobic respiration. Further study of pre-package fumigation is required to improve technology of fresh ginseng marketing.
Influence of different strains of Agrobacterium rhizogenes on hairy root induction and growth in Scutellaria baicalensis
Park, Woo-Tae ; Kim, Young-Seon ; Park, Nam-Il ; Kim, Haeng-Hoon ; Lee, Sook-Young ; Park, Sang-Un ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 213~217
Agrobacterium rhizogenes, a gram-negative soil bacterium, is one of the most widely studied among them. A, rhizogenes can transfer T-DNA, excised from Ri (root inducing)-plasmids from the bacterial to the plant cell. It is the causal agent of 'hairy root' diseases in plants, and has been used for the production of hairy root cultures from a multitude of species. Five different strains of Agrobacterium rhizogenes differed in their ability to induce Scutellaria baicalensis hairy roots and also showed varying effects on the growth in hairy root cultures. A. rhizogenes R 1000 is the most effective strain for the induction (57.3%) and growth (11.9 g
) in hairy root of Scutellaria baicalensis. Our results demonstrate that use of suitable strains of A. rhizogenes may allow study of the regulation of flavone biosynthesis in hairy root cultures of Scutellaria baicalensis.
Projection of climate change effects on the potential distribution of Abeliophyllum distichum in Korea
Lee, Sang-Hyuk ; Choi, Jae-Yong ; Lee, You-Mi ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 219~225
Changes in biota, species distribution range shift and catastrophic climate influence due to recent global warming have been observed during the last century. Since global warming affects various sectors, such as agriculture and vegetation, it is important to predict more accurate impact of future climate change. The purpose of this study is to examine the observed distribution of Abeliophyllum distichum in the Korean peninsula. For this purpose, two period (present and future) climate data were used. Mean data between 1950 and 2000, were used as the present value and the year 2050 and 2080 data from A1B senario in IPCC SRES were used for the future value. Potential habitation is analyzed by MaxEnt(Maximum Entropy model), and Abeliophyllum distichum's coordinates data were used as a dependent variable and independent variables are composed of environmental data such as BioClim, altitude, aspect and slope. The result of six types GCM mean calculation, the potential habitability decreased by 40-60% of the average existing distribution. The methodogies and results of this research can be applicable to the climate changing adaptation stratiegies for the biodiversity conservation.
Cryopreservation of chrysanthemum shoot tips using the droplet-vitrification technique
Lee, Yoon-Keol ; Park, Sang-Un ; Kim, Haeng-Hoon ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 227~233
This study aimed at developing cryopreservation protocol for chrysanthemum (Dendranthema grandiflora Tzelevcv. peak) shoot apices based on droplet-vitrification procedure, which is a combination of droplet-freezing and solution based vitrification. Progressive preculture of shoot apices in liquid MS medium supplemented with 0.3 and 0.7 M sucrose for 31 and 17 hours, respectively, was found optimum among preculture treatments tested. The composition of both loading and vitrification solutions significantly affected recovery growth of shoot tips before and after cryopreservation. Balancing glycerol and sucrose concentrations in the solutions was beneficial for recovery growth. The highest recovery after cryopreservation was observed when apical shoot tips were extracted from 4-week-old in vitro plantlets, progressively precultured with 0.3-0.5-0.7 M sucrose for 32-16-6 hours, respectively, then treated with loading solution comprising of 1.9 M glycerol + 0.5 M sucrose (35% PVS3 solution). Apices were then dehydrated with the vitrification solution consisted of 50% glycerol + 50% sucrose for 90 minutes then directly immersed in liquid nitrogen.
A study on the deduction of the barrier factors in the forest trail for the disabled using wheelchairs
Kweon, Hyeong-Keun ; Lee, Joon-Woo ; Park, Bum-Jin ; Sin, Won-Sop ; Yeom, In-Hwan ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 235~241
Recently, as people have become more interested in health issues, their demand on forest trails for bush walking exercise has increased. The purpose of the study is to select barrier factors into forest trail for disabled using wheelchairs. As a result this, it has selected 31 barrier factors through the Delphi method. Of all the these factors, the information board of forest trails, showing the location of the trails, has indicated the highest score of importance at 4.50. Next, securing hiker' walking safety space has indicated an importance level of 4.44; both the slope of forest trails and the height of obstacles have indicated an importance level of 4.38; and the effective width of forest trails has indicated the highest score of importance level of 4.33. From these indicated levels of importance, the respondents of the Delphi method consider the safety of users of forest trail' as the most important factor while the physically disables are hiking. That is why these factors have resulted in acquiring relatively higher values.
Characteristics of large patch occurrence at warm-season turfgrass in golf course
Woo, Hyun-Nyung ; Kim, Gi-Rim ; Kim, Hye-JIn ; Chung, Doug-Young ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 243~248
This investigation was conducted to develop an integrated disease management system against large patch disease occurred in a golf course. Large patch, brown patch, and Rhizoctonia blight sometimes are used interchangeably by turfgrass managers and researchers, Large patch disease of zoysiagrass is caused by a soilborne fungus called Rhizoctonia solani. Although this fungus is very similar to the one that causes brown patch disease of cool-season turfgrasses in mid-summer. Large patch development is favored by high thatch and soil moisture. Avoid overwatering the turfgrass, especially in the fall or early spring. Poorly-drained areas are very susceptible to injury from large patch and should be reconstructed (draining tiles, etc) to avoid soil saturation. However, control of yellow patch with fungicides is normally not recommended because the disease has only cosmetic effects and symptoms are usually very short-lived. Therefore, we reviewed the symptom of large patch to look for control method by soil management method.
Characterization of BLV env gene in Korean Holstein dairy cattle
Jeong, Hang-Jin ; Yu, Seong-Lan ; Lee, Jun-Heon ; Do, Chang-Hee ; Suh, Guk-Hyun ; Ryoo, Seung-Heui ; Chung, Sang-Il ; Sang, Byung-Chan ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 249~255
This study was performed to investigate the characterization of infectious BLV env gene isolated form Korean Holstein Cattle and to determine its incoming origin. Gp51 region of BLV env gene known as having important role in immunological function was characterized using PCR-RFLP sequencing and phylogenetic analysis. BLV env gene was grouped into PCR-RFLP patterns with three restriction endonucleases including Pvu II, BamHI and Hae III, and we identified two new RFLP patterns from nucleotide sequences of each group. Phylogenetic analysis showed that 80% of the Korean Holstein was included in the USA and Japanese group. These results here can provide a valuable information about the character of the BLV env gene and research on infection route of BLV.
Association of genetic polymorphism in fatty acid synthase with BodyFat and fatty acid composition in Hanwoo
Lee, Seung-Hwan ; Kim, Hyeong-Cheol ; Cho, Won-Mo ; Chang, Sun-Sik ; Kim, Bum-Soo ; Chang, Gul-Won ; Lee, Jun-Hun ; Yeon, Seong-Heum ; Hong, Seong-Koo ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 257~262
The aim of this study was to identify the polymorphism on fatty acid synthase (FASN) gene and its association with fat traits and fatty acid composition in Hanwoo. We genotyped a SNP (g.16024G
A) detected in Exon34 of FASN on 90 Hanwoo steers by PCR RFLP. A linear mixed model revealed an association of g.16024G
A with total body fat contents (P=0.006), while there is no significant effect between g.16024G
A and other traits (IMF, BF and fatty acid composition). Regression coefficient and
of the SNP was -1.5 kg and 0.36 in this anslysis. Expecially, AA type of g.16024G
A bas a less amount of body fat (1.5 kg) than GG type of the SNP in Hanwoo. In conclusion, this study indicates an important role for FASN gene in determining body fat content in Hanwoo.
Effect of Yukmijihwangtang meal silage on the performance of hanwoo steers
Cha, Sang-Woo ; Oh, Hyun-Min ; Park, No-Sung ; Cho, Chi-Hyun ; Lee, Bong-Duk ; Lee, Hyung-Seok ; Lee, Soo-Kee ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 263~268
This experiment was conducted to investigate the effect of feeding TMR with or without Yukmijihwangtang meal silage on the growth performance, meat yield and quality of Hanwoo steers. Sixteen male Hanwoo steers in the late fattening period were randomly assigned to a control diet and Yukmijihwangtang meal diet, with eight heads per treatment. The supplementation of Yukmijihwangtang meal silage did not affect the feed conversion rate, ribeye area, and meat yield index of cold carcass of Hanwoo. Fat thickness of Hanwoo s loin obtained from silage supplementation was significantly lower than that of non-supplemented. Total grade in meat yield of Hanwoo from silage supplementation were higher than that of non-supplemented control. The supplementation of Yukmijihwangtang meal silage to Hanwoo decreased the marbling score significantly, but did not affect fat color, firmness, and maturity. Total grade of meat quality of Hanwoo with Yukmijihwangtang meal supplementation was lower than that of non-supplemented control. In conclusion, Yukmijihwangtang meal could be used as partial substitution (10%) in TMR for fattening cattle. However, it is considered that Yukmijihwangtang meal can be a useful feed for the periods of growing or early fattening than that of late fattening since it improved meat yield but decreased meat quality grade of Hanwoo steers.
Sex determination of in vivo- and in vitro-derived bovine embryos
Han, Rong-Xun ; Kim, Hong-Rye ; Diao, Yun-Fei ; Jin, Dong-Il ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 269~275
The objective of this study was to develop a rapid and reliable PCR method for sexing of morula or blastocyst stage bovine embryo. BOV97M and bovine 1.715 satellite DNA sequences were selected for amplification of male and bovine specific DNA, respectively. But the unbalanced number of copies of these two repetitive sequences required some modification of PCR method. Karyotyping of blastomeres were carried for the confirmation of sex determination in bovine embryos. The coincidence rate of sex between biopsied-single blastomere and matched blastocyst was 80.0%. When in vivo- and in vitro- derived embryos were compared, 61.8% and 56.7% were male in in vitro- and in vivo-derived embryos, respectively. In vivo-derived embryos showed better hatching rate than in vitro-derived embryos following biopsy of blastomeres. In conclusion, rapid and effective PCR could be applied to sexing of bovine preimplantation embryos using single blastomere. The sensitivity of this assay may eliminate the need for biopsy of more than one nucleated blastomere and reduce trauma to the embryos derived from biopsy procedure.
Monitoring of compositions of gamma-linolenic and omega-3 fatty acids in some functional foods consumed in market
Kim, Dae-Kyung ; Shin, Jung-Ah ; Lee, Ki-Teak ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 277~284
The compositions of health functional food products (HFFP; 18 products) containing gamma linolenic acid (GLA;
, n-6) and omega-3 fatty acids (EPA and DHA) were investigated. The contents of index components (especially, GLA and omega-3) in HFFPs were monitored by GC-FID analysis. Among the GLA products (sample No. 1~8), the content of GLA in most samples (except sample No.6) ranged from 8.04 to 9.98 g/100 g. These results were suitable for the reference standard (more 7.0 g/100 g) of HFF. In the omega-3 products (sample No. 10 and 15) derived from harp seal oil (HSO), the total contents of EPA and DHA were 14.21-15.98 g/100 g, respectively. These values were suitable for the reference standard (more 12.0 g/100 g) of HFF. Besides, among the omega-3 products (sample No.9, 11~14, 16~18) derived from fish oil, the total content of EPA and DHA ranged from 24.11 to 31.20 g/100 g. These results were suitable for the reference standard (more 18.0 g/100 g) of HFF. In the result of TLC analysis, the HFFPs of 18 were mainly composed of triacylglycerols (TAGs). The content of trans fatty acid in 18 HFFPs was detected in less than 0.30 g/100 g. For the detection of trans fatty acid,
-NMR (600 MHz) can be used because chemical shift of trans fatty acid was observed at 5.3 ppm in this study.
Identification and quantification of glucosinolates in rocket salad (Eruca sativa)
Kim, Cho-Rok ; Lim, Young-Sil ; Lee, Sang-Won ; Kim, Sun-Ju ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 285~294
Glucosinolate (GSL) contents were investigated (i) at 1~7 days after sowing (DAS) in seed sprouts and (ii) at 3-7 weeks after sowing for the time-course. Moreover, (iii) They were compared with five different cultivars of rocket salad (Eruca sativa). Seventeen GSLs were separated by HPLC analysis, and 10 GSLs among them were identified as glucoraphanin, sinigrin, glucoalyssin, diglucothiobeinin, glucobrassicanapin, glucoerucin, glucobrassicin, dimeric, 4-mercaptobutyl GSL, 4-methoxy glucobrassicin, gluconasturttin by using LC-APCI-MS analysis, but 7 compounds were not identified. (i) The total GSL content in seed sprouts initially increased up to 3 DAS and then decreased according to their seedling growth. In particular, glucoraphanin known as a strong anti-cancer reagent was found the highest level (5.05
dry wt.) at 3 DAS. The most abundant GSL was glucoerucin ranged from 26.0~49.6
dry wt. (ii) In the time-course, the total GSL contents increased dramatically from 3-week (5.91
dry wt.) to 7-week after sowing (32.2
dry wt.). The major GSLs were glucoraphanin, glucoerucin and 4-methoxy glucobrassicin. (iii) By comparing GSL contents with five different cultivars, the total GSL contents increased from 4-week to 6-week after sowing, regardless of cultivar. In 4-week-old, the order with the total GSL content was "Rucola" > "Rocket Herbs"
"Odyssey" > "Takii" > "Herb", but in 6-week-old it is changed as "Takii" > "Herb" > "Odyssey" > "Rucola" > "Rocket Herbs" even there was almost no significantly difference between them.
Determination of hesperidin in mixed tea by HPLC
Han, Saem ; Mok, So-Youn ; Kim, Hye-Min ; Lee, Jeong-Min ; Lee, Dong-Gu ; Lee, Sook-Young ; Kim, Jong-Kee ; Kim, Sun-Ju ; Lee, Sang-Hyun ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 295~299
The content of hesperidin in the mixed tea, which was composed of dried orange peel, laurel leaf, mulberry leaf, silver magnolia leaf, oriental melon tap, cassia seed, and licorice root, was determined by high performance liquid chromatography (HPLC). Hesperidin was quantified by a reverse phase column with gradient solvent system (watcr:acetonitrile = 80:20 to 35:65 for 30 min) and UV/VIS detection (280 nm). The How rate was kept constant at 1.0 ml/min. The content of hesperidin in the mixed tea was measured in depending on extraction time 1, 2, 3, and 4 min (29.07, 52.39, 52.45, and 88.35 mg/g, respectively).
Properties and fate of nitrogen in a reclaimed tidal soil
Kim, Hye-JIn ; Kim, Gi-Rim ; Woo, Hyun-Nyung ; Park, Suk-Hyun ; Shin, Ji-Hoon ; Choi, Yoon-Chul ; Chung, Doug-Young ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 301~307
In this article, we reviewed properties of reclaimed tidal soil and fate of nitrogen in its soil. The results were summarized as followings. Most of the soil derived from the fluvio-marine deposit were silly textured soils. The EC of the Saemanguem soil were ranged from 14.7 to 33.9 dS
, pH was 7.7. The organic matter content was low with 1.5 g
. The cation exchange capacity was 7.2 cmol
and exchangeable sodium percent was high with range 45.1 % to 56.2%. High sodium concentration caused poor drainage. The salinity significantly affects efficiency of N fertilizer in reclaimed tidal soil.
A study on the dominant discharge in small and medium-sized stream (Yo-Stream)
Rim, Chang-Soo ; Lee, Joon-Ho ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 309~314
The purpose of this study is to select the dominant discharge which mostly affects the formation of the channel shape in Yo-Stream. So far, three different discharge conditions such as bankfull discharge, discharge of a specific recurrence interval, and effective discharge have been considered as an indicator of dominant discharge. Therefore, three different discharge conditions were studied and based on the study results, dominant discharge was selected for Yo-Stream. When comparing bankfull discharge and effective discharge at Beonam stream gaging station, it has turned out that effective discharge was 10
/sec, which is 6 times greater than bankfull discharge of 58.83
/sec. Furthermore, when comparing bankfull discharge and discharge of a specific recurrence interval, bankfull discharge was quite similar to discharge with recurrence interval of 1.52 years. Previous study results also indicate that dominant discharge occurs with recurrence interval of similar duration. Therefore, discharge of 58.83
/sec was considered as a dominant discharge, which corresponds to discharge with recurrence interval of 1.52 years.
Vegetation survey in nature-friendly small streams for each protection method
Lee, Kang-Suk ; Park, Jin-Ki ; Yeon, Gyu-Bang ; Park, Jong-Hwa ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 315~324
Riparian vegetation distribution patterns and diversity relative to various fluvial geomorphic channel patterns, stream bank stabilization methods, and stream flow processes are described and interpreted for selected nature-friendly small stream bank protection of Goesan, central Korea. Idong Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods which was nature-friendly stream bank protection. The project aim to maintain or increase stream bank stabilization ecosystem goods and services while protecting downstream and stream bank ecosystem. A number of protecting methods which were a Flight of fieldstone, Vegetation block, Green river block, Stone net, Green environment block, Eco friendly cobble, Vegetation mat and Geo-green cell and Firefly block were applied on the bank of Idong stream. The stream sites have been monitored about vegetation conditions each method in 2007. We selected six points to separately investigate in left and right bank. The main purpose of this study was to find out suitable methods and to improve stream restoration techniques for ecosystem. On the stream bank, H environment block method (9.7) was the highest average of vegetation coverage and Firefly block method (3.87) was the lowest average in applied methods.
Development of evaluation indicators for riparian restoration with biodiversity consideration
Park, Eun-Young ; Choi, Jae-Yong ; Kim, Hyoun-Sook ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 325~330
In order to revive the ecological function of degraded rivers, a total restoration plan for riverbeds and riparians needs to be developed. Previous evaluations for rivers were mainly focused on the river's physical structures. Therefore, this research has developed indicators to evaluate a riparian restoration considering biodiversity. Through literature and previous cases review, 4 fields and 13 indicators are selected for the evaluation. Four fields are biodiversity, habitat diversity, connectivity and habitat functionality. In the biodiversity field, 4 indicators of the exuberant extent of herbaceous vegetation and their diversity, the exuberant extent of shrub and woody plants and their diversity, the number of plant communities and naturalized plants are included. Habitat diversity are comprised of 4 indicators of the longitudinal continuity of vegetation, the mixture of plant communities, the extent of plant type color fruit abundance and the distribution of vegetation. Connectivity includes 3 indicators of target distribution, the shore slope of low water channels and the extent of artificial embankment materials. Habitat functionality has 2 indicators of the status of food supply plants and the habitat functionality. The value weighting for the fields and indicators has been calculated based on the AHP(Analytic Hierarchy Process) method. 50 experts were surveyed with quantifiable questionnaire, among them 43 experts have more than 10 yesrs experiences in the nature restoration field. The selected and weighted indicators have been tested to the 12 sections in Gap stream located in Daejeon. In conclusion, the indicators are feasible and the selected indicators could be used to establish the direction and objectives of riparian restoration.
Variation of water supply for instream flow from reservoirs with various magnifications of paddy irrigation area to watershed area
Noh, Jae-Kyoung ; Lee, Jae-Nam ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 331~341
To provide variation of water supply for instream flow from reservoirs with various magnifications of paddy irrigation area to watershed area, 8 reservoirs were selected to draw operation rule curve and to analyze water supplies from reservoirs. Reliability of 90% for supplying irrigation water from reservoir was able to maintain and instream flow water was able to be supplied only in the reservoir with magnification of paddy irrigation area to watershed area above 3. The more magnification of paddy irrigation area to watershed area increased, the more ratio of irrigation water to total water storage decreased, and the more ratio of instream flow water to total water storage increased. From the heightening 113 reservoirs in Korea, annual irrigation water was estimated to 1,146.05
in normal operation, 839.57
in withdrawal limited operation, and annual instream flow water was estimated to 149.68
in normal operation, 283.19
in withdrawal limited operation. It was concluded that withdrawal limited operation was followed to have the premise of saving irrigation water, more instream flow water was able to be supplied from reservoirs with high magnification of paddy irrigation area to watershed area.
Development of recognition system of field shape and tillage characteristics for autonomous tractor
Seo, Il-Hwan ; Seo, Dong-Hyun ; Kim, Man-Soo ; Chung, Sun-Ok ; Kim, Ki-Dae ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 343~347
Precise traveling and tillage operation using an autonomous tractor is difficult with the data from the Geographic Information System(GIS) because it does not include the data of the width and inclination of the field to work. The minimum turing radius of the tractor could be different from the value presented by the tractor maker due to the moisture content of the field soil or operators' skill. Two programs were developed to process data obtained with the tillage path measuring system: one for recognizing coordinates of the 4 field corners, and the other for recognizing the minimum turning radius of the tractor.
Development plan to apply renewable energy for rural villages
Rhee, Shin-Ho ; Yoon, Seong-Soo ; Park, Hyung-Soo ; Jeon, Jeong-Bae ; Choi, Ae-Soon ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 349~360
The international oil price have being fluctuated due to the exhaustion of fossil energy problem became big social issue. Rural villages are relatively sensitive to the energy problem, reflecting the characteristics of rural sustainable and stable introduction of renewable energy sources that are available is essential. In addition, through the influx of young workers in rural areas to regain vitality, efforts to improve rural living environment has been under the rural newtown project. In this study, a survey aimed at rural dwellers through the AHP, interview to report of realization about renewable energy and review the current policies. The results of realization survey though AHP are as follows, (1) the advantage of the natural environment (2) the superiority of government supporting policy and being economic, (3) easy to use, (4) ecologically stable, and (5) policy stable, respectively. In addition, renewable energy sources among the inhabitants of rural areas by solar energy was the highest score. The impact of regional characteristics compared with other energy sources receive little, easy to apply and has already been considerable technological development is considered.
A consumer perception for the safety of imported chinese food : the place of origin or environmental-friendliness of the raw bean?
Choi, Se-Hyun ; Gim, Uhn-Soon ; Lee, Hyun-Ju ; Cho, Jae-Hwan ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 361~368
This study aims to examine the consumer preference for packaged bean curd that takes a growing public interest. Specifically, this study tried to examine which is more important - the place of origin of the raw bean or the environmental-friendliness of the raw bean. Surveys were conducted to obtain information, such as the consumer evaluation for food safety on imported food products from China and the consumer perception of Chinese organic food products, Using the binary probit model, the relationship between consumer's choice of packaged bean curd and potentially important factors that can affect the consumer's choice was analyzed. A summary of this research and some policy implications follow. The results of this study can be used as the basic guideline as to how to extend the safety of imported food products, in general, and how to further develop the packaged bean curd industry in Korea, in particular.
Situations of GAP certified ginseng and 4P's strategies
Hong, Seung-Jee ; Kim, Kwan-Hoo ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 369~381
Ginseng in Korea has not only the big production value but also till a good reputation from overseas in the name of 'Korea Ginseng'. Having spread rapidly nationwide from 2000 year, its production keeps on increasing but its consumption becomes lazy and its price is also falling down because of comsumer's concern about mainly overusing pesticide for ginseng. In order to cope with this problem, the government introduced the GAP certification system to ginseng in 2006 to reflect consumer's needs for food safety. This system will be a good opportunity to promote ginseng consumption dramatically. In this aspect it is very important to know how well this system is established and how ginseng farmers build marketing strategies to draw new wind in the market. This study was carried out to look over the GAP certified ginseng system and show its marketing strategies using 4P's(product, place, promotion and price). The main results are as follows. GAP ginseng system currently has some weaknesses such as lack of systematic certification management and after-service, nonrealistic certification fee and poor linkage from production to consumption. In the marketing mix strategies, product strategy suggests that the most desirable appearance be transplanted ginseng filled with branch roots and 4 to 5 year-ginseng, and it is necessary to choose multi-brand strategy divided for present into for self-sufficiency and family brand strategy by use if its brand enlarges to processed products in the future. In the place strategy, 3 stages like 'producer group' - 'GAP certified facility' - 'sales shop' are based as the physical marketing channel according to traceability, and connected with giant retail market and environment friendly stand, and if its sales volume enlarges, it should be considered the GAP ginseng specialized marketplace which is a type of chain store. In the promotion strategy, the promotion of government level is necessary at first and producer alliances require the promotion targeting at the group of women under 40 with differentiation from price, quality, and safety. In the price strategy, the early stage-high price strategy which sets 20~25% higher for self-sufficiency and 30~35% for present is desirable.
Substitution elasticities of the imported and domestically produced pulp and paper
Kim, Se-Bin ; Kim, Dong-Jun ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 383~391
Traditional international trade theory assumes that import goods and domestically produced goods of the same industry are equal in quality. However the substitutability of the two goods is imperfect. This article estimated the import functions of pulp and paper using econometric and vector autoregressive models, and calculated the elasticities of substitution between imported and domestically produced pulp and paper. The import of pulp is inelastic to import price and domestic price, and elastic to national income in econometric model. And it is inelastic to import price, domestic price and national income in vector autoregressive model. On the other hand, the import of paper is inelastic to domestic price, and elastic to import price and national income in econometric model. And it is inelastic to import price and domestic price, and elastic to national income in vector autoregressive model. The elasticity of substitution between imported and domestically produced pulp was positive, and the elasticity was respectively 0.42 and 0.20 in econometric and vector autoregressive models. This may be because of the high proportion of imports. On the other hand, the elasticity of substitution between imported and domestically produced paper was positive, and the elasticity was respectively 0.75 and 0.81 in econometric and vector autoregressive models. This may be because the quality of imported paper is different from that of domestically produced paper.
The analysis on the effects of change of international grain price on the processed food price in Korea
Kim, Soung-Hun ; Kim, Bae-Sung ; Choi, Ji-Hyeon ;
Korean Journal of Agricultural Science, volume 38, issue 2, 2011, Pages 393~404
The international grain price shows dramatic change, which results in the price change of Korean processed food. Recently, Korean government and consumers started discussing about the effects of change of international grain price on the processed food. However, few studies have analyzed this effects. The goal of this paper is to analyze the effects of price change of international grain, especially wheat, soybean, and sugarcane, on the processed food price in Korea. As the results of analysis, three findings are presented: First, the size and timelag of the effects of change of international grain price on the processed food price is different due to products, Second, there is the possibility that processed food price in Korea will increase, Third, Korean government has some methods to manage the price change of processed food, even though government cannot totally control the price.