• Title/Summary/Keyword: 경작지 토양

Search Result 213, Processing Time 0.024 seconds

Biodegradation of Fungicide Tolclofos-methyl by Sphingomonas sp. 224 (Sphingomonas sp. 224 균주에 의한 살균제 tolclofos-methyl의 분해)

  • Kwak, Yun-Young;Shin, Kab-Sik;Lee, Sang-Man;Kim, Jang-Eok;Rhee, In-Koo;Shin, Jae-Ho
    • Korean Journal of Environmental Agriculture
    • /
    • v.29 no.4
    • /
    • pp.388-395
    • /
    • 2010
  • In order to decrease level of an organophosphorus fungicide, tolclofos-methyl, from in situ ginseng cultivating soil, we isolated a tolclofos-methyl degrading bacteria from ginseng cultivating soil samples. The bacterial strain removed tolclofos-methyl around 95% after 3 days incubation with complete liquid media. The strain was identified as Sphingomonas sp. by 16S rDNA sequence comparison, and designated as Sphingomonas sp. 224. Through the GC-MS analysis, Sphingomonas sp. 224 was proposed to have an initiative degradation pathway generating the metabolite such as 2,6-dichloro-4-methyl phenol compound from tolclofos-methyl. In addition, Sphingomonas sp. 224 was confirmed representing the effective degrading capability to tolclofosmethyl in situ soil.

Effects of Soil Bulk Density on Saturated Hydraulic Conductivity and Solute Elution Patterns (토양의 용적밀도에 따른 포화수리전도도 및 음이온의 용출양상)

  • Kim, Pil-Joo;Lee, Do-Kyoung;Chung, Doug-Young
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.30 no.3
    • /
    • pp.234-241
    • /
    • 1997
  • The effects of bulk densities(${\rho}_b$) on saturated hydraulic conductivity (Ksat) and solute elution patterns were investigated from five different bulk densities ranging from $1.1Mg/m^3$ to $1.5Mg/m^3$ with each increment of $0.1Mg/m^3$. The hydraulic conductivities observed were divided into two stages: (1) a linearly decrease with increase in bulk density up to $1.4Mg/m^3$, (2) a steady state where the bulk density is greater than $1.4Mg/m^3$. Using the saturated hydraulic conductivity at the steady state, we figured out the equation describing the correlation between bulk densities(${\rho}_b$) and saturated hydraulic conductivity(Ksat) as follows: $Ksat=-19.2({\rho}_b{^2})+6{\rho}_b+15.5$, (r=0.985). Electrical conductivity(EC) measured from the leachate of the soil column showed that EC at the same pore volume were decreased with an increase in the bulk density from $1.2g/cm^3$, $1.5g/cm^3$, as shown in the time taken to collect the same pore volume at each respective bulk density. The maximum relative concentrations (C/Co=1) from the breakthrough curves for the anions of $Cl^-$, $NO_3{^-}$ and $SO_4{^{2-}}$, which are weakly adsorbed on the soil particles, moved to the right of the graph, while a distinctive retardation occurs at the bulk density between $1.3Mg/m^3$ and $1.4Mg/m^3$. The time taken to recover about 90% of indigenous sulphate was approximately twice as those of chloride and nitrate, resulting in slightly stronger adsorption characteristics for sorption sites on the soil surface. Thus, we can conclude that the salt accumulation in green house soil might be significantly influenced by it's bulk density at the soil depth, as well as the adsorption capacity of ions for the sorption sites in soils.

  • PDF

Effects of Compost Application on Soil Loss and Physico-Chemical Properties in Lysimeters (퇴비시용(堆肥施用)이 토양유실량(土壤流失量)과 토양이화학성(土壤理化學性)에 미치는 영향)

  • Yun, Bong-Ki;Jung, Pil-Kyun;Oh, Se-Jin;Kim, Sun-Kwan;Ryu, In-Soo
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.29 no.4
    • /
    • pp.336-341
    • /
    • 1996
  • This study was conducted to investigate the effects of compost application on the soil loss and physico-chemical properties at the slope land from 1990 to 1991. Lysimeters with 15% slope. 5m slope length. 2m width and 1.2m depth were constructed in 1984 and filled with sandy loam, loam, clay loam. and clay soils. Treatments were bare soil, compost(1.5ton/10a) and non-compost with soybean-barley cropping system from 1984. Losses of soil were increased with the order of sandy loam, clay, loam and clay loam. Run-off was increased with the order of sandy loam, loam, clay loam and clay, but leachate was decreased with the same order. Compost treatments decreased 33.6-44.6% of soil loss and 17.0-24.0% of run-off but increased 17.1-33.7.% of leachate as compared with the non-compost treatments. The amount of soil loss was positively correlated with the amount of run-off by Y = 12.125+0.063X (r=$0.970^{**}$)and negatively correlated with the leachate by Y=43.425-0.096X(r=$-0.917^{**}$). The application of compost increased soil pH, OM, CEC and extractable cations. Application of compost decreased bulk density but increased porosity, water stable aggregate and available water. These results provide that the compost application plays an important role in conserving soil and water, and improving soil physico-chemical properties.

  • PDF

Phenotypic Characterization of Methylotrophic N2-Fixing Bacteria Isolated from Rice (Oryza sativa L.) (벼(oryza sativa L.)에서 분리한 Methylotrophic N2-Fixing Bacteria의 형태학적 특성)

  • Madhaiyan, Munusamy;Park, Myoung-Su;Lee, Hyoung-Seok;Kim, Chung-Woo;Lee, Kyu-Hoi;Seshadri, Sundaram;Sa, Tong-Min
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.37 no.1
    • /
    • pp.46-53
    • /
    • 2004
  • In this study, we compared the levels of methylotrophic bacterial community diversity in the leaf, stem, grain, root and rhizosphere soil sainples of four rice cultivars collected from three regions of Korea. Thirty five pigmented and five non-pigmented isolates showing characteristic growth on methanul were obtained. When phylotypes were defined by performing numerical analysis of 42 characteristics, four distinct clusters were formed. While two clusters, I and IV diverged on the basis of nitrate and nitrite reduction, other two clusters, comprising only pink pigmented colonies, diverged on the basis of cellulase activity. Out of the two reference strains used in the analysis, Methyhbacterium extorquens AM1 diverged from all the clusters and M. fujisawaense KACC 10744 grouped under cluster III. All the isolates were positive for urease, oxidase, catalase and pectinase activity and negative for indole production, MR and VP test, $H_2S$ production, starch, and casein hydrolysis. No clusters were found to possess thermotolerant isolates, as no growth of the isolates was observed at $45^{\circ}C$. Two strains in cluster I were found to possess gelatin hydrolysis and methane utilizing properties respectively. Most of the isolates in all the four clusters utilized monosaccliarides, disaccharide and polyols as carbon source. Six isolates showed considerable nitrogenase activity ranging from 86.2 to $809.9nmol\;C_2H_4\;h^{-1}\;mg^{-1}$ protein.

Atomic Absorption Spectrophotometric Analysis of Heavy Metals in the Soils of Paddy Fields Around Industrial Areas (원자흡광법에 의한 공업단지(경인${\cdot}$전북)주변답 토양중의 중금속함량분석에 관한 연구)

  • Park Seung Heui
    • Korean journal of applied entomology
    • /
    • v.18 no.1 s.38
    • /
    • pp.49-53
    • /
    • 1979
  • Paddy lands around industrial areas in Gyeonggi and Jeonbuk provinces are increasingly concerned about pollution by heavy metals. This stimulated the quantitative analysis of copper, zinc, lead and cadmium in the soil from the aress concerned. Results obtained are summarized as follows: 1. Heavy metal contents of the soil from Sue-Myun, Siheung-Gun, Gyunggi province were 20.95 ppm of Cu, 226.46 ppm of Zn, 84.17 ppm of Pb, and 2.62 ppm of Cd, respectively. Those of Anyang, Kimpo, and Jeonbuk areas were as low as the natural background levels, about 10 ppm. 2. The contentration of heavy metals of the river valley soils tended to increase from upper stream to the lower. This seemed to be caused by the fact tat disposed water from plants flows to the lower stream and metals contained in the water accummlate in the soils around the lower stream. 3. Cadmium content was exceptionally lower than 0.2 ppm in all the areas tested. The present concentartion of cadmium is not of the extent to which any injury could occur to rice plants.

  • PDF

Estimation of Carbon Sequestration and Its Profit Analysis with Different Application Rates of Biochar during Corn Cultivation Periods (옥수수 재배기간 동안 바이오차 시용 수준에 따른 탄소 격리량 산정 및 이익 분석)

  • Shin, JoungDu;Choi, Yong-Su;Lee, SunIl
    • Journal of the Korea Organic Resources Recycling Association
    • /
    • v.24 no.3
    • /
    • pp.83-90
    • /
    • 2016
  • Despite the ability of biochar to enhance soil fertility and to mitigate greenhouse gas, its carbon sequestration and profit analysis with arable land application have been a few evaluated. This study was conducted to estimate carbon sequestration and to evaluate profit of greenhouse gas mitigation during corn cultivation periods. For the experiment, the biochar application rates were consisted of pig compost(non application), 2,600(0.2%), 13,000(1%), and 26,000(2%) kg/ha based on pig compost application. For predicting soil carbon sequestration of biochar application, it was appeared to be linear model of Y = 0.5523X - 742.57 ($r^2=0.939^{**}$). Based on this equation, soil carbon sequestration by 0.2, 1 and 2% biochar application was estimated to be 1,235, 3,978, and 14,794 kg/ha, and their mitigations of $CO_2$-eq. emissions were estimated to be 4.5, 14.6, and 54.2 ton/ha, respectively. Their profits were estimated at $14.6 for lowest and $452 for highest. In Korea Climate Exchange, it was estimated that the market price of $CO_2$ in corn cultivation periods with 0.2, 1 and 2% biochar application was $35.6, $115.3 and $428.2 per hectare, respectively. For the plant growth response, it was observed that plant height and fresh ear yield were not significantly different among the treatments. Therefore, these experimental results might be fundamental data for assuming a carbon trading mechanism exists for biochar soil application in agricultural practices.

Degradation of Fungicide Tolclofos-methyl by Chemical Treatment (살균제 Tolclofos-methyl의 화학적 처리에 의한 분해)

  • Shin, Kab-Sik;Jeon, Young-Hwan;Kim, Hyo-Young;Hwang, Jung-In;Lee, Sang-Man;Shin, Jae-Ho;Kim, Jang-Eok
    • Korean Journal of Environmental Agriculture
    • /
    • v.29 no.4
    • /
    • pp.396-401
    • /
    • 2010
  • Tolclofos-methyl is one of the most widely used organophosphorous pesticides in control of soil-borne diseases in ginseng field. In Korea, residues of tolclofosmethyl in ginseng and cultivation soil is quite often detecting. The objective of this study was to know the possibility for the accelerated degradation of tolclofos-methyl by various chemical treatment under soil slurry condition. The degradation of tolclofos-methyl was accelerated by zerovalent metals treatment in soil slurry. The degradation rate of tolclofos-methyl was found to be at higher zerovalent zinc than unannealed zerovalent and annealed zerovalent iron. The effect of different sizes of zerovalent iron on tolclofos-methyl degradation was showed that the smaller size of zerovalent iron, the greater the degradation rate. In aqueous solution of pH 4.0 below the degradation rate of tolclofos-methyl was very high. Under this experimental condition, tolclofos-methyl degradation was the greatest at 2% (w/v) of ZVI under 0.1 N of HCl in 24 hours, the degradation rate was 94.4%. By testing various chemicals, it was found that $Fe_2(SO_4)_3$ as iron source showed better for degrading tolclofos-methyl in $H_2O_2$ 500 mM treatment and sodium sulfite also showed the degradable possibility tolclofos-methyl in soil slurry.

Soil Chemical Properties of Peach Orchard and Nutrient Content of Peach Leaves In Gyeongbuk Area (경북지역 복숭아 과수원 토양 화학성 및 복숭아 엽의 양분함량 조사)

  • Seo, Young-Jin;Kim, Jong-Su;Kim, Jae-Kyu;Cho, Jae-Uk;Kwon, Tae-Young;Lee, Jae-Seog
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.35 no.3
    • /
    • pp.175-184
    • /
    • 2002
  • Soil chemical parameters of peach orchards and the concentration of nutrients in peach leaves were investigated. Results of soil analysis showed that pH value and content of exchangeable calcium was quite low, required to adjust soil acidity in many investigated soils. Nitrogen and phosphorous contents in leaves were founded to be excessive comparing to RDA's optimal levels(N $29.3{\sim}35.9g\;kg^{-1}$, P $1.7{\sim}2.2g\;kg^{-1}$), while calcium contents were lower than optimal levels($11.2{\sim}21.0g\;kg^{-1}$) in many sites and Potassium content was higher in peach cultivars than nectarine cultivars. Correlation analysis revealed that organic matter contents in subsoils and exchangeable calcium content in soils(top and subsoil) were increased with cultivation year, but available phosphate contents in subsoils were decreased. Organic matter and exchangeable magnesium contents in top soils were positively correlated with potassium and magnesium contents in leaves, whereas were negatively correlated with calcium contents in leaves, impling antagonistic absorption of calcium against potassium and magnesium. The findings indicated that most of soils ought to managed to adjust soil acidity and application amount of nitrogen, phosphorous fertilizer and compost should be controlled properly.

A Survey on the Soil Environments of Alpine Vegetable Housing in Honam Area (호남지역(湖南地域) 고냉채소단지(高冷菜蔬團地)의 토양환경연구(土壤環境硏究))

  • Yoo, Chul-Hyun;Cho, Guk-Hyun;Choi, Jeong-Weon;Park, Keon-Ho
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.21 no.3
    • /
    • pp.246-253
    • /
    • 1988
  • This survey was carried out to obtain the basic information for the stable high yield of income-crops. Cropping systems, soil morphological and chemical properties were investigated. The obtained results were summarized as follows: 1. In Jinan and Jangsu, cultivated area of radish was 76.5% and.65.4%, respecitively, but in Unbong Chinese Cabbage, 71.1%, by second Crop. 2. In topographycal distribution, the mountain foot slope area in Jinan, Jangsu and Unbong was 69, 77 and 85%, respectively. In the distribution of elevation, semi-Alpine region in Jinan and Unbong was 85 and 69%, respectively, but Alpine region in Jangsu was 62%, of cultivated area. 3. Ploughing depth was 0 to 10 cm in Jinan and Jangsu, and 11 to 15cm, in Unbong. Gravel content class was 4th class in Jinan and 3rd class in Jangsu and Unbong. 4. For the distribution of soil types, normal upland came to 69.2% in Unbong, sandy and skeletal upland, 46.1 % and normal and sandy upland, 39 and 38%, respectively, in Jangsu. 5. The uplands soil classified as the 5th class, with improper for adequate cropping were. 6. For the chemical properties according to topography available phosphate $(-0.344^*)$, Ca $(-0.398^*)$, K $(-0.485^{**})$ and CEC $(-0.325^{**})$ showed the negative significancy with the elevation. 7. Among the variations of chemical properties by continuous cropping, the soil pH $(-0.491^{**})$ and the content of organic matter $(-0.434^{**})$, Ca $(-0.705^{**})$, CEC $(-0.512^{**})$, total nitrogen $(-0.559^{**})$ showed the high negative correlations, while the contents of available phosphate $(0.671^{**})$ and K $(0.543^{**})$ showed the high positive correlations, with the number of years of continuous cropping.

  • PDF

An Auxin Producing Plant Growth Promoting Rhizobacterium Bacillus subtilis AH18 which has Siderophore-Producing Biocontrol Activity (Auxin과 Siderophore 생산성 다기능 생물방제균 Bacillus subtilis AH18)

  • Jung Hee-Kyoung;Kim Jin-Rak;Woo Sang-Min;Kim Sang-Dal
    • Microbiology and Biotechnology Letters
    • /
    • v.34 no.2
    • /
    • pp.94-100
    • /
    • 2006
  • To isolate a bacterium that produces plant growth promoting hormone, a total of 29 bacteria were obtained from the soil in Gyeongsan, Korea. Among these, 14 strains were selected by their positive reaction on Salkowski to produce auxin. All of these were then tested for their property to produce siderophore using CAS (chrome azurol S) blue agar, and one was chosen for its ability to produce both, auxin and siderophore. This strain, denoted, AHl8, showed 1.5 times higher adventitious root induction rates than controls, using mung-beans. The strain also showed efficient biocontrol properties towards Fusarium-wilt of tomatoes in artificial pot assays. The strain was identified as Bacillus subtilis by 16s rDNA comparison and Biolog analyses. Growth and media conditions for Bacillus subtilis AH1 8 to highly produce siderophore were also investigated.