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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Environmental Agriculture
Journal Basic Information
Journal DOI :
The Korean Society of Environmental Agriculture
Editor in Chief :
Volume & Issues
Volume 11, Issue 3 - Nov 1992
Volume 11, Issue 2 - Oct 1992
Volume 11, Issue 1 - Jun 1992
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Studies on the Several Soil Factors Affecting on Alachlor and Paraquat Adsorption by Soils
Lim, Soo-Kil ; Bong, Won-Ae ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 101~108
In order to illustrate adsorption phenomena of herbicides(alachlor and paraquat) on soils, absorption equation of herbicides and the relationships between soil properties and adsorption constants were investigated with 22 soils. The results were as follows : 1. The shaking time for approaching equillibrium reaction of herbicides(alachlor and paraquat) with woils were about 30 minutes for paraquat and 4 hours for alachlor, respectively. 2. The distribution coefficients of alachlor were inbetween 0.81-33.83 in 5 ppm and 0.09-15.52 in 50 ppm, respectively. 3. The adsorption of alachlor was positively correlated with organic matter and paraquat was with clay content of soils. 4. Both paraquat and alachlor were highly adsorbed in Chunpo series soil containing low contents of organic matter and clay on account of different mechanism from other soils, 5. Freundlich's adsorption constant(K) was greater than distribution coefficient(Kd), and the differences between K and Kd's were to be increased with increasing equillibrium concentrations.
Affinity of Diazinon and Humic Substances as a Substrate of Microorganisms in Paddy Soil
Song, Jae-Young ; Lee, Kyu-Seung ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 109~115
In order to investigate waether soil microorganism prefer diazinon to humic substances as their substate, the growth of soil bacteria and the activities of monooxygenase and
were measured after treatment of diazinon and humic substances in defined medium at
. Also, the degradation rate of diazinon was determined by addition of humic substances to the medium. The number of soil bacteria was increased from 1 day and 3 days after the treatment with humic substances and diazinon, respectively. And it showed about 1.5 times more with humic substances than diazinon at 10 days. Monooxygenase(MO) activity with the treatment of humic substances was higher than diazinon until 3 days after treatment in the order of HA > FA > humin. Esterase(ES) activity with the treament of humin and HA was higher than dizainon from 5 dyas, but FA was much similar to diazinon. The degradation rate of diazinon showed more persistancy by addition of humic substances ; 51.4% with humin treatment, 58.9% with HA, 62.4% with FA and 71.9% in control at 10 days after treatment. Therefore, as soil microorganisms perfer humic substances to diazinon, the degreadation rate of diazinon might be delayed by addition of humic stbstances in submerged soil.
Behavior of Synthetic Pyrethroid Insecticide Bifenthrin in Soil Environment I) Degradation Pattern of Bifenthrin and Cyhalothrin in Soils and Aqueous Media
Kim, Jang-Eok ; Choi, Tae-Ho ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 116~124
This study was conducted to elucidate degradation pattern of two synthetic pyrethroid insecticides, bifenthrin having 2-methylbiphenyl group and cyhalothrin having
-cyano benzyl ester group in theirs alcohol moiety, in two soils and aqueous media under laboratory conditions. The half-life of bifenthrin was 85.1 days and 12,4 days in Chilgok and Bokhyen soil of aerobic upland condition, respectively, and that of cyhalothrin was 54.6 days and 32.2 days. Bifenthrin and cyhalothrin were degraded very slowly under anaerobic flooded condition and sterilized. Their degradation seemed to be mainly mediated by aerobic microorganisms in soil. Bifenthrin and cyhalothrin were degraded more rapidly in Bokhyen soil with rich organic matter than Chilgok soil. Cyhalothrin was degraded 30 days faster than bifenthrin under aerobic upland condition of two soils. Cyhalothrin was degraded more than bifenthrin in alkaline solution of pH 10, but cyhalothrin and bifenthrin were degraded very slowly in acidic solution of pH 2 and 6.
Behavior of Synthetic Pyrethroid Insecticide Bifenthrin in Soil Environment II) Identification of Degradation Product and Leaching of Bifenthrin in soil
Kim, Jang-Eok ; Choi, Tae-Ho ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 125~132
This study was conducted to know degradation products of the synthetic pyrethroid insecticide bifenthrin under soil, aqueous solution and UV-light irradation, and know its movement by leaching in soil. The major degradation product of bifenthrin was identified with 2-methylbiphenyl -3-y1 methanol by HPLC, UV, Mass and NMR under soil, aqueous solution and UV-light irradiation, The main degradation route was hydrolysis of the ester linkage. On exposure to UV-light, bifenthrin was decomposed almost completely in concentrations of 10 and 100 ppm in 24 hr but decomposed about 80% in 1,000 ppm. Bifenthrin was immobile in soil column system and on soil thin-layer chromatography system. Mostly bifenthrin remained in the 0-2.0㎝ layer of soil column and soil TLC.
Studies on Removal of Heavy Metals in Irrigation Water by Water Hyacinth
So, Kyu-Ho ; Kim, Bok-Young ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 133~139
Removal of heavy metals by water hyacinth, Eichhornia crassipes Solms-Laub, was examined with two heavy metals Cd, Cu under laboratory conditions. Cd in culture solution was reducd to 0.116, 0.873, 2.015, 3.755 and 4,747 mg/L from 1, 2, 3, 4 and 5 mg/L for 24 hrs, after cultivating of water hyacinth respectively And, Cu was reduced to 0.086, 0.600, 2.174, 3.473, and 4.365 mg/L from 1, 2, 3, 4, and 5 mg/L for 24 hrs, after the cultivation, respectively. Cu was removed faster than Cd nd airating cultivation was effected higher than fixing cultivation. Removal effect of heavy metals by water hyacinth was higher in low a heavy metal cocentration than in high concentration
The Relationship between Pollutants in Soil and Leaves in Air Polluted Areas
Kim, Jong-Kab ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 140~145
In order to find out pollutants in leaves of pinus thunbergii, and relationship between pollutants in soil and leaves of pinus thunbergii surrounding Onsan Industrial Complex in Korea, this study was performed. Concentrations of water-soluble sulfur of P. thunbergii leaves were a range of 0.06%-0.25%, but at the vicinity of industrial complex, it was judged to be hindered in growing trees as a range of 0.13%-0.25%. In P. thunbergii leaves the contents of Fe, Mn, Zn and Cu were showed as a range of 87.2 ppm-319.8 ppm, 100.0 ppm-581.3 ppm, 39.0 ppm-134.0 ppm and 1.2 ppm-4.8 ppm, respectively, and they were generally high at P. thunbergii leaves of the vicinity of refinery of industrial complex. But concentrations of Cu and Pb only showed little contents. In the correlation between soil and leaves pollutants, there were significant correlation between total S and water-soluble S(r=
), between Fe(r=
)), and Cd(r=
) in soils and those in P. thunbergii leaves at 10% or 5% level, respectively, and as these results, it was inferrec that heavy metals in soils had relations with those in leaves.
Decomposition Characteristics of DDVP , Malathion and Diazinon Emusifiable Concentrates
Yu, Ju-Hyun ; Park, Chang-Kyu ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 146~154
DDVP, malathion and diazinon ECs which differ in chemical compositions and moisture contents were formulated with nine emulsifiers, three solvents(xylene, cyclohexanone and DMF) and epichlorohydrin. For the studies of decomposition characteristics, these technicals and ECs were subjected to the test under elevated temperature at
for 15 days and
for 90 days respectively. DDVP technical was rapidly decomposed in early stage of thermoaccelerated test at
, but the decomposition rate slowed down with time. As for malathion and diazinon technicals, the longer they were incubated, the more decomposed. The decomposed AI in ECs increased with solvent polarity. The increment of moisture content in ECs accelerated the decomposition of AI, and that was remarkable especially in diazinon ECs. Addition of emulsifiers increased the moisture content to be accelerated the decomposition of AI, but the decomposition of AI was more affected by the kind of emulsifier than by the moisture content of emulsifier, Stabilizing effect by epichlorohydrin was distingished in malathion and diazinon ECs, but there was no effect in other solvent-based formulation except xylene.
Short-term Sustained Release Formulation of KC-6620 with Porous Carrier
Yu, Ju-Hyun ; Park, Chang-Kyu ; Lee, Byung-Hoi ; Cho, Kwang-Yun ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 155~162
In order to extend the releasing period of granular formulation to approximately 20 days, the KC-6620-adsorbed granules were formulated with carriers and polyethylene glycol as adjuvant. The releasing rates of active ingredient from the formulations were evaluated in aqueous medium. The baked bentonite was found most effective carrier to sustain the release of KC-6620. Due to, however, low releasing rate of active ingredient after 20 days, bentonite formulation appeared to be of no practical for the short-term sustained release of KC-6620. The increased pore volume of bentonite granular formulation by adding pyrophyllite increased remarkably the released amount of KC-6620 from bentonite-pyrophyllite(4 : 6) granule up to 85% of total active ingredient incorporated. Addition of polyethylene glycol to the bentonite-pyrophyllite granule further increased the releasing rate of KC-6620. With KC-6620 content in the bentonite-pyrophyllite(4 : 6) granule, the releasing rate of active ingredient was markedly reduced.
The Pattern of Weed Occurence and the Effect of single or combinated Treatment of several Herbicides on Weed Control and Yield in Taro (Colocasia antiquorum var. esculenta Engl. ) Field
Kang, Byeung-Hoa ; Lee, Sang-Gak ; Shim, Sang-In ; Lee, Gi-Chul ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 163~169
A cultivar of taro(Colocasia antiquorum var. esculenta Engl.), Tosutoran was cultivated with planting density 60×30 cm at the field of Kwang-ju located in Kyeong-ki province in 1989. The purpose of this experiment was to attain the basic information about the pattern of weed occurrence and the effect of weed control on yield by various treatments in taro field. Ethalfluralin(35 EC), Clomazone(47.1 EC), Paraquat(24.5 Lq.) fb Ethalfluralin and Paraquat fb Clomazone were treated except for untreated plot and hand weeding plot. Weeds occurred were 15 species in 12 families, the dominant weed species were Echinochloa crus-galli, Potulaca oleracea, Acalypha australis in taro field. Weed control effects were higher in combination treatments than in single treatments so the yield was higher in combination treatment than in single treatment. Yield of untreated plot was reduced to 91.8% by comparison with that of hand-weeding plot.
Foreign Periodicals in Environmental Sciences
Lee, Su-Rae ;
Korean Journal of Environmental Agriculture, volume 11, issue 2, 1992, Pages 170~174