• 한국자원식물학회지
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• 제20권4호
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• pp.348-352
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• 2007

인위적인 토양 pH 변화가 식물에 미치는 영향과 식물의 생화학적 방어반응을 조사하고자 황산용액을 첨가하여 산성화시킨 토양(pH 5.3, 4.5, 3.9, 3.5)에 만수국을 이용하여 실험을 수행하였다. 토양 산성화에 의해 MDA 함량이 크게 증가되었다. 토양의 $H^{+}$ 부하량 증가에 따라 산화형인 DHA 및 GSSG의 함량이 크게 증가되었다. 항산화 효소의 활성도 토양의 $H^{+}$ 부하량의 증가에 따라 증가하는 것으로 나타났다.

• 한국환경농학회지
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• 제20권5호
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• pp.346-351
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• 2001

Oxidation of Cr(III) to Cr(VI) can increase availability and toxicity of chromium. In this study, possible mechanisms by which pH and organic matter can control the chromium oxidation and reduction in soil system were examined using four soils of different pHs and organic matter contents. Reduction of Mn-oxides occurred in the soils of higher organic matter content (4.0%), but Mn-oxide was quite stable during the incubation in the soil of pH 7.0 and 0.5% organic matter content. Manganese oxides can be reductively dissolved at lower pH and higher organic matter conditions. The soil of pH 7.0 and 4.0% organic matter content showed the highest Cr-oxidation potential. Reduction of soluble Cr(VI) was observed in all the soils examined. The most rapid reduction was found in soil of pH 5.5 and 4.0% organic matter content, but the reduction was slow in soil of pH 7.0 and 0.5% organic matter content. Thus, the reductive capacity of organic matter added soils was much higher as compared to other two soils of lower organic matter content. In all the soils examined, the reductive capacity of soluble chromium was much higher than the oxidative capacity. Organic matter was found to be the most important controlling factor in the chromium oxidation and reduction. Reduction of Cr(VI) to Cr(III) could be a potentially useful remediation or detoxification process, and availability and toxicity of chromium in soil would be controlled by controlling organic matter content and pH of the soils.

• 한국토양비료학회지
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• 제44권1호
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• pp.22-28
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• 2011

With the increasing cultivation of acid-loving plants such as blueberries, the artificial acidification of soils is frequently required. This research was conducted to determine the application rates of elemental sulfur (S) required in the soil acidification for blueberry cultivation. Laboratory incubation experiment was conducted to acidify three arable soils (pH 6-7) of different texture to pH 4.5-5.0 by the addition of varying amounts of elemental S. All rates of elemental S addition reduced soil pH, although the efficacy of acidification was related to the application rate and soil characteristics. pH reduction was slow in sandy loam soil, and the final equilibrium pH was obtained after 60, 43, and 30 days of incubation in sandy loam, loam, and silty clay, respectively. Although the final pHs obtained after 93 days of incubation were not significantly different among the three soils, the equilibrium pH was relatively higher in soil of higher clay content in the application rates of 1.5-2.0 g S $kg^{-1}$ soil. The estimated amounts of elemental S required in lowering pH to 4.5-5.0 were 0.59-1.01, 0.67-1.03, and 0.53-0.88 g S $kg^{-1}$ for sandy loam, loam, and silty clay, respectively. The lowest estimated amount of elemental S in the acidification of silty clay soil was attributable to the low organic matter content. For clay soils containing optimum level of organic matter, the application rates of elemental S should be much higher than those values estimated in this research. Soil acidification did not significantly increase the available concentrations of Ca, Mg and K. Extractable Cu and Zn was not greatly affected by the acidification, but extractable Fe, Mn, and Al in the acidified soils were higher than those found in non-acidified soils. Such increases in solubility are attributable to the dissolution of oxides and hydroxides of the elements.

• 한국자원식물학회지
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• 제19권4호
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• pp.515-516
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• 2006

기린초의 토양 pH별 생육특성을 보면 pH가 낮을수록 생육초기부터 후기까지 초장, 엽수, 분지수 등의 생육이 좋았으며 특히 초장과 분지수에서는 pH처리에 따라 통계적인 유의성이 인정되었다. 따라서 기린초 재배시에는 토양 pH를 $4.5{\sim}5.0$정도로 맞추어 주는 것이 pH 6.0보다 초기 활착이 빠르고 생육이 양호하며 균일성이 높아지는 것으로 나타났다.

• 생명과학회지
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• 제11권2호
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• pp.153-158
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• 2001

To investigate the effects of soil acidification on growth of Impatiens balsamina L. plants were transplanted to acidified soils with H$_2$SO$_4$ solution. The concentrations of soluble Ca, Mg, K, Al and Mn in the acidified soils increased with increment of H$^{+}$ addition to the soil. In both species, the plant height and root length were inhibited by soil acidification, showing much severer inhibition in Impatiens balsamina L. than in Tagetes patula L., As the soil pH decreases, the growth of underground parts decreased greatly than that of above ground parts in both species. Total dry weight decreased with increased Al concentration as well as lowered soil pH in both plants. There was a strong positive correlation between relative total dry weight and molar (Ca+Mg+K) / Al ratio of the soil. The results suggest that molar(Ca+Mg+K)/ Al ratio of the soil may be useful indicator for assessing the critical load of acid deposition in herb species.s.

• Journal of Plant Biology
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• 제9권3_4호
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• pp.1-6
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• 1966

The study was carried out to analyse the relationship between the frequency of accessory chromosomes in rye and soil property, such as pH, water content, P, N, K, Mg, and Ca. It was apparant that frequency of accessory chromosomes in rye was found to be higher in acidic soil than they are in basic soil. Chromosomal aberraton including translocation hetrozygote and broken centromere were found in the meiosis in PMC. It seems to be that more translocation heterozygote occurs in the plots of Paldang and Sinjangri where pH of soil shows high pH value.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.100-102
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• 2009

Effect of temperature, pH and soil depth on germination of Dianthus chinensis, Dianthus barbatus, and Perennial pennant were investigated in growth chamber and soil condition at the ratio of 7:3 (natural soil and organic soil) in laboratory condition. the optimum temperature for seed germination was recorded for $20^{\circ}C-\;25^{\circ}C$. Maximum germination was observed for Dianthus barbatus (76%) where as in soil condition Perennial pennant (51%) showed maximum germination at 1 cm soil depth. Similarly, optimum pH for seed germination was at pH 6 in all the species. So in lower pH (at pH4) seed germination was inhibited. Germination of these selected species at different environmental condition help to construct the ecological sound proof wall to mitigate the noise especially in urban areas.

• 한국토양비료학회지
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• 제2권1호
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• pp.27-30
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• 1969

토양(土壤)의 이화학적성질(理化學的性質)이 다른 20점(點)의 전답토양(田畓土壤)(전(田) 10점(點), 답(畓) 10점(點))을 공시(供試)하여 증류수(蒸溜水), N-KCl 및 0.01 M $CaCl_2$ 등(等) 3가지 침출액(浸出液)으로 토양(土壤)과 침출액(浸出液)의 비율(比率)을 달리하여 토양(土壤) pH를 측정(測定) 조사(調査)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 증류수(蒸溜水)로 침출(浸出)하여 측정(測定)한 토양(土壤) pH는 증류수량(蒸溜水量)이 많아짐에 따라서 높아졌고 그 차이(差異)는 답토양(畓土壤)에서 보다 전토양(田土壤)에서 더 컸다. 2. N-KCl로 침출(浸出)하여 측정(測定)한 토양(土壤) pH는 N-KCl량(量)이 많아짐에 따라서 약간(若干) 높아지는 경향(傾向)이다. 3. $0.01\;M-CaCl_2$로 침출(浸出)하여 측정(測定)한 토양(土壤) pH는 염류토양(鹽類土壤)을 제외(除外)하고서는 $0.01\;M-CaCl_2$량(量)에 따라서 변화(變化)가 없었다. 4. 염류토양(鹽類土壤)에서는 침출용액(浸出溶液)이 많아짐에 따라서 pH가 높아졌는데 이것은 고염농도(高鹽濃度)로 인(因)한 접착전위(接着電位)의 저하(低下)때문인 것으로 추측(推測)된다.

• 한국대기환경학회지
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• 제4권1호
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• pp.33-44
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• 1988

For the purpose of examining the effects of simulated acid rain on the chemical properties of the experimental soil in Pinus densiflora seedlings and Forsythia koreana rooted cuttings, the experimental design of randomized block arrangement with three replications was implemented in the experimental field of Yesan National Agricultural Junior College. One-year-old Pinus densiflora seedlings and Forsythia koreana cuttings were planted in the pots filled the mixed soils (nursery soil: forest soil of siliceous sandy loam = 1 : V/V)in the early spring of 1985. The regime of artificil acid rain, in terms of spray frequency per monthly and spray amount at single treatment per plot, was simulated on the basis of climatological data averaged from 30 years records. Simulated acid rain (pH 2.0, pH4.0, and pH 5.5 as control) containing sulfuric and nitric acid in the ratio of 3:2 (chemical equivalant basis) diluted ground water, were treated on the experimental plants under condition of cutting off the natural precipitation with vinyl tunnel, during the growing season (May 1 to August 31) in 1985. THe results obtained in this study were as follows; 1. Soil acidity was dropped, and exchangeable aluminum contents in the soil was dramatically increased in both species, with decreasing pH levels of acid rain. 2. Exchangeable potassium, clacium, magnesium contents, and base saturation degree of the soil were highly drcreased in two species as the pH levels of acid rain decreased. 3. In two species, sulfate concentrations in the soil were decreased of pH 4.0 treatment, and remarkably increased at pH 2.0 treatment of acid rain in comparison with control. 4. Total nitrogen and available phosphate contents of the soil were not affected by acid rain treatment in the both species, and Fe contents at pH 2.0 treatment were highest among three acid rain treatments.

• 한국환경농학회지
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• 제42권1호
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• pp.8-13
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• 2023

Biodegradation of antibiotics in soil can be affected by various environmental factors. This study was set to investigate the effect of environmental conditions such as soil pH and temperature on the degradation of oxolinic acid (OA), one of the agricultural antibiotics used in South Korea, in soil. Rice paddy soil (RS) and field soil (FS) were contaminated with OA and the soil pH was adjusted to 5.7±0.2, 6.8±0.2, and 7.6±0.1. The soil samples were kept at different temperatures (2.3±0.2, 23.0±0.6, 30.5± 0.3℃) for 30 d. The changes in the OA concentrations were determined at selected times. With the RS and FS, the OA removal was not affected by the soil pH used in this study; however, at pH 7.6, the OA removal in the RS was greater than that in the FS, which can be attributed to the different soil properties. The OA removal was similar at 23.0 and 30.5℃ in both soils, but was lower at 2.3℃. The information on the effect of different environmental conditions on the degradation of antibiotics in soil is very limited. Therefore, further studies are needed to better manage the residual antibiotics in the agricultural environment.