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골프장의 난지형 잔디에 발생하는 Large patch의 발병 특성
우현녕(Hyun-Nyung Woo),김기림(Gi-Rim Kim),김혜진(Hye-JIn Kim),정덕영(Doug-Young Chung) 충남대학교 농업과학연구소 2011 농업과학연구 Vol.38 No.2
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.
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압밀과 포화수준에 따른 분쇄 Coir 혼합 펄라이트의 수분보유력과 수리전도도
김기림(Gi-Rim Kim),우현녕(Hyun-Nyung Woo),김혜진(Hye-Jin Kim),박미숙(Mi-Suk Park),송진아(Jin-A Song),송태용(Tae-Yong Song),장효주(Hyo-Ju Jang),정덕영(Doug-Young Chung) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6
This investigation was performed to determine the hydraulic conductivity coefficient and water holding capacity for a specified compaction forces which are the amount of mechanical energy applied to the porous granule (PG) volume. Most current specifications of minerals and perlite as growth media require to be compacted to a specified density, which in general is equivalent to a certain percentage of laboratory compaction. The water holding capacity of the saturated PG was very large at potential above <SUP>-1</SUP> bar compared with perlite, but very little water remained below this value. The water holding capacity and hydraulic conductivity characteristics of graded PG amended with the ground coir less than 2 mm in diameter were also determined from pressure outflow data. The saturated hydraulic conductivity of the saturated and compacted PG was slightly lower by more than one tenth order of magnitude at equal matric potentials of perlite, but when expressed on the basis of equal water deficits, the conductivity of PG was higher at all but the smallest deficits than those of perlite.
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다양한 광원이 배추 내 Carotenoid와 Glucosinolate 함량에 미치는 영향
성호영 ( Ho-young Sung ),조이경 ( Lee-kyeong Jo ),천진혁 ( Jin-hyuk Chun ),우현녕 ( Hyun-nyung Woo ),김선주 ( Sun-ju Kim ) 한국환경농학회 2018 한국환경농학회지 Vol.37 No.2
BACKGROUND: Chinese cabbage biosynthesizes various phytochemicals including carotenoids and glucosinolates. Environmental stress has a major effect on the growth and yields of vegetables, and can significantly affect nutritionally important phytochemicals. Phytochemicals of plants are influenced by light, temperature, carbon dioxide, and growing conditions. The aim of this study was to investigate the effect of various light sources on carotenoid and glucosinolate contents in Chinese cabbage. METHODS AND RESULTS: [Experiment I] Set the control (field control, FC) on the ground. Using acrylic sunlight, experiments were set up transparency box (field transparency, FT), red box (field red, FR) and blue box (field blue, FB). [Experiment II] Set the control (chamber control, CC) in the greenhouse. Using plant growth chamber with artificial light, experiments were set up LED red (chamber red, CR), LED blue (chamber blue, CB), LED mixed red+blue (chamber red+blue, CRB) and fluorescent (chamber fluorescent, CF). After plant growth, Chinese cabbage was harvested at 110 days after sowing (DAS). The status of plants growth (leaf length, width, fresh weight etc.) was immediately investigated. Carotenoid and GSL contents were analyzed by HPLC. [Experiment Ⅰ] Results documented that the ranges of total carotenoid contents were 25.39 ~ 58.80 mg/kg dry wt for lutein, 0.84~ 4.22 mg/kg dry wt for zeaxanthin, and 3.85~18.71 mg/kg dry wt for β-carotene. Lutein was the highest for the content and the largest for the variation as well. [Experiment II] Results documented that the ranges of total carotenoid contents were 24.66~137.96 for lutein, 2.51~20.65 for zeaxanthin, and 8.40~49.80 mg/kg dry wt for β-carotene. The total carotenoid contents of CR (156.62) and CB (115.90) were 1.6~2.3 times larger than the other treatments, and β -carotene content was about twice as high as that of the other treatments on the CR (38.74 mg/kg dry wt.). [Experiment I] Total GSL content was the highest in FT (19.76) that was higher 1.7 times than the lowest treatment (11.39 μmol/g dry wt.). [Experiment II] The total content of GSL was highest in CRB (4.19) and lowest in CF (2.88 μmol / g dry wt.). In the CRB, total GSL contents (4.19 μmol/g dry wt.) was the highest. CONCLUSION: Total and individual carotenoid and GSL contents in Chinese cabbage show significant differences under different light sources. Red and blue lights contribute to significant carotenoids expression and antioxidant activity for nutrition and health benefits. These results concluded that the introduction of varying lights affected the synthesis of important nutrient compounds in Chinese cabbage. It is predicted that the application of good light source enhances the accumulation of functional compounds.
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김혜진(Hye-JIn Kim),김기림(Gi-Rim Kim),우현녕(Hyun-Nyung Woo),박숙현(Suk-Hyun Park),신지훈(Ji-Hoon Shin),최윤철(Yoon-Chul Choi),정덕영(Doug-Young Chung) 충남대학교 농업과학연구소 2011 농업과학연구 Vol.38 No.2
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 m?¹, pH was 7.7. The organic matter content was low with 1.5 g ㎏?¹. The cation exchange capacity was 7.2 c㏖ ㎏?¹ 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.
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