• Title, Summary, Keyword: CaO회수

Search Result 63, Processing Time 0.039 seconds

Studies on the Grassland Development in the Forest IX. Effect of cutting times and cutting heights on growth and dry matter yield of grasses, and botanical compowition on woodland pasture (임간초지 발전에 관한 연구 IX. 임간초지에서 예취횟수와 예취높이가 목초의 생육과 수량 및 초지식생에 미치는 영향)

  • Seo, Sung;Lee, Joung-Kyong;Han, Young-Choon;Park, Moon-Soo;Hwang, Suk-Joong
    • Journal of The Korean Society of Grassland and Forage Science
    • /
    • v.8 no.3
    • /
    • pp.135-140
    • /
    • 1988
  • This field experiment was carried out to determine the effects of cutting times (3,4 and 5 times $yr^{-1}$) and cutting heights (3, 6 and 9 cm) on the growth and dry matter(DM) yield of grasses grown under pine trees, and botanical composition of woodland pasture. The conditions of the experimental field was south direction with 30% of shade (ca. 70% of full sunlight). Annual DM yield was higher in the plots cut 4 times (6,097 kg) and 3 times (5,953 kg) than in 5 times (5,305 kg $ha^{-1}$). However, it ip considered that total nutrient yields may be not different among 3 treatments. The yield was significantly (P < 0.05) increased with higher cutting height, regardless of cutting time. The 9 cm of stubble height was very effective on both increasing DM production and seasonal distribution of DM. In botanical composition, 3 cm and 6 cm of cutting height accelerated the percentages of bareland and weeds, regardless of cutting time, particularly in summer season. However, 9 cm of stubble height maintained 80-85% of pasture grasses in all cutting times. In this experiment, therefore, cutting height was more important factor than annual cutting times for forage production and pasture longevity, and it is desirable to harvest 4-5 times per year (under this experimental field condition) with 9 cm of stubble height on woodland pasture.

  • PDF

Method for Validation of Caffeoylquinic Acid Derivatives in Ligularia fischeri Leaf Extract as Functional Ingredients (건강기능식품 기능성 원료로서 곰취잎 추출물의 Caffeoylquinic Acid계 성분 분석법 검증)

  • Kwon, Jin Gwan;Kim, Jin Kyu;Seo, Changon;Hong, Seong Su;Ahn, Eun-Kyung;Seo, Dong-Wan;Oh, Joa Sub
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.45 no.1
    • /
    • pp.61-67
    • /
    • 2016
  • An HPLC analysis method was developed for standard determinations of chlorogenic acid, 3,4-di-O-caffeoylquinic acid, 3,5-di-O-caffeoylquinic acid, and 4,5-di-O-caffeoylquinic acid as functional health materials in Ligularia fischeri extract. HPLC was performed on a $C_{18}$ Kromasil column ($4.6{\times}250mm$, $5{\mu}m$ column) with a gradient elution of 0.1% (v/v) trifluoroacetic acid and acetonitrile at a flow rate of 1.0 mL/min at $30^{\circ}C$. The analytes were detected at 330 nm. The HPLC method was validated in accordance with the International Conference on Harmonization guideline of analytical procedures with respect to specificity, precision, accuracy, and linearity. The limits of detection and quantitation for the four compounds were 3.0~14.6 and $9.2{\sim}44.4{\mu}g/mL$, respectively. Calibration curves showed good linearity ($r^2$ > 0.999), and the precision of analysis was satisfied (less than 0.9%). Recoveries of quantified compounds ranged from 98.96 to 101.81%. This result indicates that the established HPLC method is very useful for the determination of marker compounds in Ligularia fischeri leaf extracts.

Mineralogical and Physico-chemical Properties of Sludge Produced During Artificial Sand Processing (국내 화강암류를 이용한 일부 인공쇄석사 제조과정에서 발생되는 슬러지의 광물.물리화학적 특성)

  • Yoo, Jang-Han;Kim, Yong-Ug
    • Journal of the Mineralogical Society of Korea
    • /
    • v.20 no.4
    • /
    • pp.303-311
    • /
    • 2007
  • The consumption of artificially crushed sands exceeds more than 30 percent of the domestic sand supply in South Korea, and its rate is still increasing. For the manufacture of crushed sand granites and granitic gneisses are preferred, fine fractions (i.e. sludge, particles finer than 63 microns) are removed by use of flocculation agents, and its amount occupy about 15 wt%. The sludges consist of quartz, feldspars, micas, chlorite/vermiculite, kaolinites, smectites and occasionally calcite. Among the clay minerals micas are usually predominant, and $14{\AA}$ minerals, kaolinites and smectites are rather scarce. Jurassic granites usually contain more kaolinites and smectites than those of Cretaceous to Tertiary granites, probably due to longer geologic ages. On the other hand, sludge from Precambrian gneiss does not contain kaolinites and smectites. Chemical analyses for the granites and their sludges show rather clear differences in most of major chemical components. Except for $SiO_2,\;Na_2O\;and\;K_2O$, all other components represent rather clear increase. Decrease of $SiO_2$ content is attributed to the relative decrease of quartz in the sludges. And the $Na_2O decrease is caused by a relatively stronger weathering property of albite compared to Ca plagioclase. The $K_2O$ content shows rather small differences throughout the whole samples. The increases of $Al_2O_3$ and other major components resulted from weathering processes and most of colored components are also concentrated in the sludges. Particle size analyses reveal that the sludges are categorized as sandy loams in a sand-silt-clay triangular diagram. The sludge is now classified as industrial waste because of its impermeability, and this result was also confirmed by rather higher hydraulic conductivities. For the environmental problems, and accomplishing effective sand manufacture, more fresh rocks with little weathering products must be chosen.