• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.34 no.2
• /
• pp.198-203
• /
• 1989

Field experiment was conducted to find out the effect of lime materials application on yield, and chemical composition of Burley 21 in 1986. Lime materials and application rate were CaSO$_4$ : Ca 35kg/l0a. CaCO$_3$ : Ca 35kg/l0a and Liming: pH6.5. Contents of Ca and Mg in fresh or cured leaves were increased, but AI, Fe and Mn were decreased by applying lime materials. Yield were increased by applying lime materials. Among lime materials treatment, yield of limed and CaCO$_3$ plot were higher than that of CaSO$_4$ plot. Value per kg of cured leaves was not affected by applying lime materials. Cured leaves of CaSO$_4$ plot contained higher NH$_3$-nitrogen and alkalinity number of water insoluble ash than those of unlimed plot. Cured leaves of CaCO$_3$, plot contained higher alkalinity number of water soluble ash, insoluble ash and volatile neutral constituent, but lower protein-nitrogen and petroleum ether extracts than those of unlimed plot. Cured leaves of limed plot contained higher alkalinity number of water soluble and insoluble ash, NO$_3$-nitrogen and volatile neutral constituents, but lower protein -nitrogen, nicotine and petroleum ether extracts than those unlimed plot. Yield was increased, however leaf Quality in respect to chemical and organoleptic characteristics were not affected considerably by applying lime materials. Therefore, it suggests that controlling the soil pH about 6.5 by liming might be necessary for tobacco cultivation.

• Korean Journal of Soil Science and Fertilizer
• /
• v.37 no.6
• /
• pp.383-387
• /
• 2004

Effects of oyster shell powder as a liming material were investigated in an apple orchard. Soil texture of the apple orchard was silty clay loam (Upyeong series with 7% of slope) and topsoil pH was 5.6. Treatments of 1,590 kg oyster shell powder $ha^{-1}$ and calcium-magnesium carbonate as much as oyster shell powder were included in the experiment. With treatments of oyster shell powder and calcium-magnesium carbonate, the length, number and diameter of new branches and the diameter of main, secondary and side branches increased in comparison with control. With oyster shell powder application, soil pH increased from 5.6 to 6.8 at the harvest. In addition, it increased exchangeable Ca from 2.6 to $4.2cmol_c\;kg^{-1}$. But it didn't make any difference in chlorophyll, sugar and malic acid contents. The apple weight per fruit of oyster shell powder application was 9 g more than that of control. Apple yield was highest ($37,000kg\;ha^{-1}$) in the oyster shell powder treatment, and the yield increase was significantly different at 5% level LSD. We concluded that the oyster shell powder can be an alternative of lime and effective to restore soil nutrient balance in apple orchard soil.

• Resources Recycling
• /
• v.33 no.1
• /
• pp.69-76
• /
• 2024

In an effort to achieve the goal of carbon neutrality, countries around the world are aiming to phase out coal-fired power plants. Due to various reasons, electricity production through coal-fired power generation and sulfur oxide (SOx) emissions are expected to continue in the future. In the South Korea, sodium bicarbonate (NaHCO₃) and lime materials are used to treat SOx, and most of the sodium bicarbonate is imported. Therefore, this research was conducted to replace sodium bicarbonate by improving the physical properties of lime materials using domestic limestone. Limestone was heat-treated through a box-type electric furnace and a vertical electric furnace. Due to the structural characteristics of the vertical electric furnace, a lime material(quicklime) was possible to improve the physical properties like a specific surface area and a pore volume. Then, they were reached to 22.33 m²/g specific area and 0.14 cc/g pore volume.

• 농업기술회보
• /
• v.45 no.4
• /
• pp.32-35
• /
• 2008

최근 일본에서는 시중에 판매되는 농약에 비해 값이 저렴한 석회를 이용하여 작물의 생육에 꼭 필요한 칼슘성분을 적극적으로 사용함으로서 작물의 면역력을 높여 병.충해를 예방, 방제하는 방법을 실천하는 농가가 늘고 있다. 주로 고토석회와 소석회를 덧거름으로 사용하는 경우가 많고, 석회가루를 직접 작물의 잎에 뿌리거나 물에 녹인 후 희석하여 뿌려주고 있다. 한편 굴 껍질이나 계란껍질을 현미식초나 목초액 등에 녹여서 뿌려주는 농가도 있다. 이런 농가 100명의 목소리를 설문 조사한 결과와 사례를 소개한다.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1999.10a
• /
• pp.215-216
• /
• 1999

연소시설, 소각시설 등에서 배출되는 아황산가스, 질소산화물, 염화수소, 불화수소 등의 산성가스를 경제적, 효율적으로 처리하는데 많은 관심의 대상이 되고 있는 건식 세정에는 석회석(CaCO$_3$, limestone), 생석회(CaO, lime), 소석회(Ca(OH)$_2$, hydrated lime) 등 calcium을 다량 함유하는 흡수제가 매우 효과적이라고 알려져 있다. 따라서 이러한 흡수제와 SO$_2$dml 화학반응에 관하여 많은 연구가 수행되어 왔으나, 대부분의 연구는 SO$_2$와 석회석이 고온에서 진행되는 화학반응에서 관한 것이다.(중략)

• Resources Recycling
• /
• v.19 no.3
• /
• pp.33-44
• /
• 2010

In this study, the possibility of utilizing carbide lime waste, obtained from the generation of acetylene process, as a alkali activator of blast furnace slag cement was investigated. The physical and chemical analysis of the carbide lime waste was studied and three types lime waste in order to investigate behaviour as alkali activator were used. Lime wastes were added 0, 10, 20 and 30 wt.% in blast furnace slag and blast furnace slag containing lime waste were added 0, 10, 30 and 50 wt.% in OPC. As a result of analysis of hydration properties, in the case of calcium hydroxide rehydrated after heat treatment at $800^{\circ}C$, it was higher hydration rate than other specimens. For the results of compressive strength test, when lime waste passed 325 mesh sieve and rehydrated calcium hydroxide were used, it was higher compressive strength than OPC from hydration 7days. At OPC50 wt.%-BFS45 wt.%-AA5 wt.% system using lime waste of 325 mesh under, the highest compressive strength appeared.

• Journal of the Korea Concrete Institute
• /
• v.27 no.1
• /
• pp.3-9
• /
• 2015

In this study, hydration properties of ordinary Portland cement were examined, shown from a limestone and blast furnace slag alone or their mixture up to 10% as a minor mineral additives. As of setting time, it was identified that final setting became faster as the amount of limestone mixture increased, which showed limestone accelerated early hydration faster than blast furnace slag. This is because limestone did accelerate the hydration of alite. At the age of 3 days, limestone 5%-blast furnace slag 5% mixture had the highest compressive strength of mortar. It is because hydration acceleration of alite by limestone, and $Ca(OH)_2$ that was additionally formed by hydration acceleration of alite reacted with blast furnace slag, and as a result, additionally created C-S-H hydrate. Regarding the hydration properties by the age of 7 and 28 days, limestone 3%-blast furnace slag 7% of composited mixture showed the largest compressive strength, and in comparison with the 3 days in curing age. This period is when hydration reaction of blast furnace slag is active and the amount of hydrate depends on the amount of blast furnace slag mixture more than that of the limestone mixture. And in order to vitalize hydration reaction of blast furnace slag the amount of $Ca(OH)_2$ created has to increase, and thus, a small amount of limestone is necessary that can accelerate the hydration of alite. Therefore, after the age of 7 days, the fact that there were a large amount of blast furnace slag mixture and small amount of limestone mixture was effective to the strength development of ordinary Portland cement.

• Korean Journal of Soil Science and Fertilizer
• /
• v.16 no.1
• /
• pp.64-71
• /
• 1983

This experiment was carried out to investigate the effect of lime and phosphorus on soil and yield of rice plants in acid sulfate soil. 1. Lime requirement plus phosphorus (20Kg/10a) plot showed 60% increased in yield. 2. The effect of increase was 36% in lime and 15% in phosphorus. 3. pH and Eh were reversed each other by lime application, and lime and phosphorus increased soil reduction. 4. Sixty two percent of root was distributed in top soil (0-5cm) of control plot while it spreaed in sub soil (5-10cm) with high level of lime and phosphorus plot. 5. Soil pH reached maximum at maximum tillering stage and decreased there after approching near to original pH. But lime requirement was about half of original one. 6. There was significant positive correlation between yield silica or phosphorus in soil, which were high with increase of pH. 7. The application of lime and phosphorus increased nitrogen content in plants. When contents of phosphorus in rice plants were high the yield of rice was increased.

• The Journal of the Petrological Society of Korea
• /
• v.16 no.2 s.48
• /
• pp.47-58
• /
• 2007

This study examines the distribution of basement rocks in Gyochon-ri, Muan-eup, Muan-gun, Jeonnam where ground subsidence occurred in June 2005, and traces corrosion of limestone. Mica schist and rhyolite are distributed in the surface of the study area, but thick limestone layer with large and small caverns are distributed underground. A horizon of limestone with maximum width of 300 m and 4 km of length was found along the detour which is in the north of pound subsidence. Such identification of limestone presence would be very useful to predict potential ground subsidence. Limestone in this area was disturbed by fold and fault due to severe shearing deformation. Small caverns were frequently found in anticline part of folds formed in limestone layer. Schists with different thicknesses were intercalated in the limestone with shearing deformation and consist of sheet silicate minerals (chlorite and mica) and quartz. In sections of weathered specimen, it is shown that biotite of schist part was altered into chlorite and corrosion of calcite around the schist followed. This suggest that ground water permeated between intercalated sheet silicate minerals and corrosion of limestone began. And small caverns were generated where active corrosion occurred. This study suggests that because of many reasons (for instance, reclamation of the Bulmu reservior and excess pumping), cavern water level was lowered and cave sediments were removed, and it caused ground subsidence to occur.

• Korean Journal of Soil Science and Fertilizer
• /
• v.22 no.1
• /
• pp.39-44
• /
• 1989

This experiment was conducted to mature newly reclaimed upland and to increase soybean yield at this upland, Kim Jae, Jeon Buk, Koera from 1987 to 1988. Lime, lime-magnesium and calcium sulfate were applied with two, levels, amount of lime requirement, and 1.5 times of lime requirement. The results were summarized as follows: 1. The yields of soybean among treaments were in order of lime-magnesium 1.5 times, lime 1.5 times, lime-magnesium, calcium sulfate, lime and control with significancy at 1% level. 2. Correlations between yield components and inorganic element contents (T-N, $P_2O_5$, CaO and MgO) in plant at flowering stage were positive, but manganese in plant was negative at 5%, respectively. 3. Correlations, between yields and MgO and CaO contents in plant at flowering stage were positive, but Mn in plant was negative at 5% respectively. 4. Inorganic element contents of the soils at flowering stage were higher than those of before experiment. Correlation between yield and base saturation degree in soil at flowering stage was positive at 5%.