• Journal of The Korean Society of Grassland and Forage Science
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• v.37 no.4
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• pp.301-307
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• 2017

A new barley(Hordeum vulgare L.) cultivar 'Dachung' having high forage yielding and good silage quality was developed at National Institute of Crop Science, RDA in 2015. This cultivar was derived from a cross of the 'Sunwoo' and 'Keunalbori1ho' in 2002. And it's promising line showed both high yield and lodging resistance through the preliminary and advanced yield trials(PYT, AYT) at Iksan from 2010 to 2012. It was designated as the 'Iksan479'. 'Iksan479' was conducted to regional yield trials(RYT) in six locations around Korea for three years from 2013 to 2015. And it was released as the name of 'Dachung'. It has erect plant type, growth habit of IV and green leaf. In the paddy field its heading date was April 24 and maturing date was May 26, same day with 'Youngyang'. Plant height of 'Dachung' was 99cm. Dachung's spikes per $m^2$ was 625. It has high rate of leaf blades, resistance to BaYMV(Barley Yellow Mosiac Virus) and better winter hardiness than that of 'Youngyang'. The average dry matter of 'Dachung' was about $11.9ton\;ha^{-1}$ in paddy field. And average feed quality of 'Dachung' was 9.0% of crude protein content, 31.3% of ADF (Acid Detergent Fiber), 54.4% of NDF (Neutral Detergent Fiber), 64.0% of TDN (Total Digestible Nutrients). 'Dachung' had grade I of silage quality. This cultivar would be suitable for the area above the daily minimum temperature of $-8^{\circ}C$ in January in Korean peninsula.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.1
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• pp.57-65
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• 2020

This study was conducted to investigate the effect of sowing and harvesting dates on agronomic characteristics and feed values of rye and triticale at Sanchoeng, South Korea. The experimental design consisted of the different sowing and harvesting dates as follows; rye (Secale cereale L., cv. Gogu) of sowing (October 15, 25, and November 5) in 2015 and harvesting (April 20, May 1 and May 11) in 2016, and triticale (X Triticosecale, cv. Joseong) of sowing (October 15, 25, and November 5) in 2015 and harvesting (May 18, 28, and June 7) in 2016. In rye, fresh and dry matter (DM) yields increased (p<0.05) with the delayed-harvesting date. Crude protein (CP) content and relative feed value (RFV) decreased (p<0.05) with the delayed-harvesting date, but neutral detergent fiber (NDF) content increased (p<0.05). In triticale, fresh and dry matter (DM) yields increased (p<0.05) with the delayed-harvesting date. The CP content decreased (p<0.05) with the delayed-harvesting date, but NDF content and RFV increased (p<0.05). This study concluded that rye sown in the middle of October then harvested in early May, and the triticale sown at the end of October then harvested at the end May are recommended to increase dry matter yield and feed value.

• Korean Journal of Food Science and Technology
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• v.46 no.6
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• pp.750-756
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• 2014

This study was performed to understand the effect of cultivation periods on the physicochemical characteristics of the starch of five sweetpotato cultivars, cultivated in Muan, Korea. Starch, protein, and ash contents increased with increased cultivation period, whereas amylose content decreased. Rapid viscosity analysis showed that the pasting temperature, peak viscosity, breakdown, setback and final viscosity increased with increased cultivation period. However, trough and final viscosity decreased. Although the onset temperature and peak temperature values increased, the conclusion temperature did not show any consistent patterns by differential scanning calorimetry. X-ray diffraction showed that the starch samples had C-type crystallinity irrespective of the cultivation period and cultivar. The starch granules were dominantly round and oval, or polygonal irrespective the cultivation period. The bigger the particle size was, the longer the cultivation period was.

• Korean Journal of Environmental Agriculture
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• v.30 no.2
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• pp.144-152
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• 2011

BACKGROUND: Eutrophication occurs occasionally in flood control reservoirs around Juam lake in summer and early autumn. Lakeside macrophyte which is one of internal pollutants effects on water quality when it is submerged during water surface is rising after rainy season. METHODS AND RESULTS: To improve water the quality of water from water supply source and to establish the management plan of submerged plants in flood control reservoirs around Juam Lake, the removal and release velocities of nutrients by submerged plants in site 1 and 2 were investigated. Removal or release velocity constant (K) of COD by Carex dimorpholepis Steud in column was 0.07~0.18 $day^{-1}$ at 0~4 days after flooding, -0.23~-0.17 $day^{-1}$ at 5~19 days after flooding and -0.28~0.03 $day^{-1}$ at 20~33 days after flooding. Removal or release velocity constant (K) of T-N by Carex dimorpholepis Steud was 0.02 $day^{-1}$ at 0~4(8) days after flooding, -0.13~-0.10 $day^{-1}$ at 5(9)~33 days after flooding in column. Removal or release velocity constant (K) of T-P by Carex dimorpholepis Steud was 0.05~0.06 $day^{-1}$ at 0~4 days after flooding, -0.14~-0.09 $day^{-1}$ at 5~33 days after flooding. Release velocity constant (K) of nutrients by Miscanthus sacchariflorus Benth was lower than that by Carex dimorpholepis Steud. In site 1, the amount of nutrients release by Carex dimorpholepis Steud was 6,719 kg/month/area for COD, 2,397 kg/month/area for T-N and 466 kg/month/area for T-P. The amounts of nutrients release by Carex dimorpholepis Steud were higher than those by Miscanthus sacchariflorus Benth in both sites. CONCLUSION(s): The results of this study suggest that COD, T-N and T-P in water quality of Juam lake were strongly influenced by submerged plants in flood control reservoirs.

• Korean Journal of Environmental Agriculture
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• v.28 no.2
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• pp.179-185
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• 2009

This study was carried out to investigate the effect of selenium treatment on the growth of vegetables sprout. Four vegetables, such as cabbage, lettuce, pak-choi and leaf mustard were examined under various selenium treatments (0, 1, 5, 10, 25, 50, 100 mg $L^{-1}$). Seed germinations in cabbage, pak-choi and leaf mustard were significantly inhibited at high concentration of selenium treatment. However, seed germination in lettuce was not much inhibited. Growth characteristics, such as soot length, root length, fresh weight and chlorophyll contents, were not much decreased at 1 mg $L^{-1}$ of selenium and then significantly inhibited with the increase of selenium concentration at above 5 mg $L^{-1}$ in all four vegetables. The selenium content increased linearly with the increase of selenium concentration. At the range of 1 to 25 mg $L^{-1}$ of selenium treatment, selenium contents in vegetables were 0.11 to 1.15 of cabbage, 0.16 to 0.61 of lettuce, 0.13 to 1.31 of pak-choi and 0.14 to 1.13 mg $g^{-1}$dw of leaf mustard, respectively. These results showed that treatment of selenium with the range of 1 to 5 mg $L^{-1}$ could be used to produce the selenium enriched vegetable sprouts.

• Journal of Life Science
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• v.16 no.6
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• pp.1060-1065
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• 2006

Non-invasive evaluation of liver function in animal models remains a challenge. Hepatoscintigraphy provides information about changes in liver size and shape, and enables to understand general liver function. Futhermore it is readily used to diagnosis complications of liver transplantation like hepatitis, rejections and biliary complications. In this study, we investigated the usefulness of evaluating the liver function in miniature pigs with $^{99m}Tc-Tin$ colloid and $^{99m}Tc-DISIDA$ which are the most commonly used radiopharmaceuticals in human medicine. In result, $^{99m}Tc-Tin$ colloid was uptaked in lung, liver, gastric wall and kidney in miniature pigs. And $^{99m}Tc-DISIDA$ showed continuous uptake images of heart, lung, liver, gallbladder and duodenum, and it was similar to human's. Therefore we could conclude $^{99m}Tc-Tin$ colloid would not be suitable for evaluating hepatic function because of it's nonspecific affinity, however $^{99m}Tc-DISIDA$ scintigraphy would be an effective method for detecting hepatobiliary function in miniature pigs.

• Tuberculosis and Respiratory Diseases
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• v.54 no.4
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• pp.395-402
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• 2003

Background : Patients with chronic obstructive pulmonary disease (COPD) are at increased risk for osteoporosis, which has implications for mobility and even mortality. The goal of this pilot study was to evaluate bone mineral density (BMD) and risk factors for osteoporosis in a limited number of men with COPD. Methods : We checked BMD, $FEV_1$(% of predicted) and investigated risk factors for osteoporosis in 44 male patients with COPD who visited our hospital from January to August 2002. Results : Mean(${\pm}$) age was $69{\pm}9$ yrs, body mass index(BMI) $21{\pm}3kg/m^2$, $FEV_1$ $50{\pm}18%$ of predicted, lumbar spine T-score $-3.0{\pm}1.2$, lumbar spine Z-score $-2.0{\pm}1.2$, and lumbar spine BMD $0.76{\pm}0.13g/cm^2$. Osteoporosis(T-score below -2.5) was present in 27 patients(61.4%) and osteopenia(T-score between -1 and -2.5) in 17(38.6%). None of the patients had normal BMD. There was no relationship between BMD and $FEV_1$(% of predicted). There were significant differences in smoking, alcohol consumption, exercise, cumulative steroid dose, BMI and BMD among the three groups according to $FEV_1$(% of predicted) (group1 : ${\geq}65%$, group2 : 50-64%, group3 : ${\leq}49%$), except age. However, there were no significant differences in these variables between the osteopenia and osteoporosis groups, except BMI. Linear Regression(Stepwise) analysis showed that lumbar BMD was correlated with BMI & exercise. Conclusion : BMD is significantly reduced in men with COPD. There was no relationship between BMD and pulmonary function.

• Journal of The Korean Society of Grassland and Forage Science
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• v.38 no.1
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• pp.23-29
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• 2018

'Dakyeong' (Avena sativa L.), a winter oats for forage use, was developed by the breeding team at National Institute of Crop Science, RDA in 2016. It was derived from a cross between 'CI7505'(IT133304) and 'Swan'(IT197920). Subsequent generations followed by the cross were handled in bulk and pedigree selection programs at Iksan and Jeonju, respectively. After preliminary and advanced yield test for 2 years, 'SO2004009-B-B-10-8-3-9', designated as a line name of 'Gwiri91', were subsequently evaluated for earliness and forage yield during 3 years in four parts such as Jeju (upland), Yesan (upland), Iksan (upland), and Jeonju (paddy), from 2014 to 2016, and finally named as 'Dakyeong'. Cultivar 'Dakyong' has leaves of dark green color, thick diameter culm and long grain of brown color. Over 3 years, the heading date of 'Dakyeong' was about 5 days earlier than that of check cultivar 'Samhan' (April 30 and May 5, respectively), and their average forage dry matter yield harvested at milk-ripe stage was higher 12% ($15.7tone\;ha^{-1}$) than $14.0tone\;ha^{-1}$ of check cultivar. Cultivar 'Dakyeong' was lower than the check cultivar 'Samhan' in terms of the protein content (6.1% and 7.0%, respectively) and total digestible nutrients (62.1%, and 62.5%, respectively), while the TDN yield was more than the check ($7.79tone\;ha^{-1}$ and $7.64tone\;ha^{-1}$, respectively). Fall sowing cropping of 'Dakyeong' is recommended only in areas where average daily minimum mean temperatures in January are higher than $-6^{\circ}C$, and it should not be cultivated in mountain areas, where frost damage is likely to occur.

• Journal of The Korean Society of Grassland and Forage Science
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• v.38 no.1
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• pp.16-22
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• 2018

Oats (Avena sativa L.), which are known as one of the forage crops of Korea, have good livestock palatability and are popular to cattle farmers because of their high dry matter. However, the cultivation of double cropping in the rice field was reluctant due to the late maturing for farmers to plant rice continuously. 'Hi-early', a winter oats for forage use, was developed by the breeding team at National Institute of Crop Science, RDA in 2016. It was derived from a cross between '517A2-121'(IT133383) and 'CI7604' (IT133379). Subsequent generations followed by the cross were handled in bulk and pedigree selection programs at Suwon, Iksan and Jeonju, respectively. After preliminary and advance yield test for 2 years, 'SO2004015-B-B-23-1-3-7', designated as a line name of 'Gwiri92', were subsequently evaluated for earliness and forage yield during 3 years in four parts such as Jeju (upland), Yesan (upland), Iksan (upland), and Jeonju (paddy), from 2014 to 2016, and finally named as 'Hi-early'. Cultivar 'Hi-early' has the characteristics of medium leaves of green color, thick diameter culm, and medium grain of brown color. Over 3 years, the heading date of 'Hi-early' was about 9 days earlier than that of check cultivar 'Samhan' (April 26 and May 5, respectively). Average forage fresh yield of 'Hi-early' harvested at milk-ripe stage was similar to check cultivar ($40.2tone\;ha^{-1}$ and 40.0 tone ha-1, respectively), and dry matter yield also was similar to check cultivar (14.2 tone ha-1 and $14.0tone\;ha^{-1}$, respectively). Cultivar 'Hi-early' was lower than the check cultivar 'Samhan' in terms of the protein content (6.2% and 7.0%, respectively) and total digestible nutrients (61.0%, and 62.5%, respectively), while the TDN yield was more than the check ($7.91tone\;ha^{-1}$ and $7.64tone\;ha^{-1}$, respectively). Fall sowing cropping of 'Hi-early' is recommended only in areas where average daily minimum mean temperatures in January are higher than $-6^{\circ}C$, and it should not be cultivated in mountain areas, where frost damage is likely to occur.

• Korean Journal of Environmental Agriculture
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• v.26 no.3
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• pp.217-222
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• 2007

To investigate effects of inorganic $(GeO_2)$ and organic (Ge-132) germanium (Ge) on seed germination and on early stage growth of plane and the uptake characteristics, various concentrations (0, 10, 25, 50, 100 mg $L^{-1}$) of Ge to popular vegetables such as leaf mustard, chinese cabbage and pak-choi, respectively, were treated. On seed germination, no significant effect was observed in both inorganic and organic Ge treatments except 100 mg $L^{-1}$ treatment of inorganic Ge. Exogenous inorganic Ge ($10{\sim}100$ mg $L^{-1}$ treatments significantly inhibited the early root elongation growth of all plants. However, slight enhancement of early shoot elongation was detected in low concentrations (10 and 25 mg $L^{-1}$) of Ge in the leaf mustard and chinese cabbage plants. Organic Ge treatments significantly stimulated the 개ot and shoot growth at the 10, 25 and 50 mg $L^{-1}$ treatments. Ge was accumulated linearly in the vegetables as both inorganic and organic Ge concentrations were increased. Interestingly, total contents of Ge in plants with Ge-132 treatments were $2\sim4.5$ times more than those with inorganic Ge treatments in all concentrations. At 25 mg $L^{-1}$ treatment of Ge, contents of Ge in vegetables are following: in leaf mustard, inorganic Ge: 0.37 mg $g^{-1}dw$ and organic Ge: 1.47 mg $g^{-1}dw;$ in the chinese cabbage, inorganic Ge: 0.4 mg $g^{-1}dw$ and organic Ge: 0.86 mg $g^{-1}dw;$ in the pak-choi, inorganic Ge: 0.33 mg $g^{-1}dw$ and organic Ge: 0.70 mg $g^{-1}dw$, respectively. These results showed organic Ge is much better on early stage seedling growth and on germanium accumulation of vegetables than inorganic Ge.