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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 20, Issue 5 - Dec 2001
Volume 20, Issue 4 - Dec 2001
Volume 20, Issue 3 - Sep 2001
Volume 20, Issue 2 - Jun 2001
Volume 20, Issue 1 - Mar 2001
Selecting the target year
Biodegradation of Aniline by Pseudomonas Rhodesiae isolated from River Water
Kim, Hyun-Ju ; Kim, Jin-Cheol ; Kim, Heung-Tae ; Choi, Gyung-Ja ; Choi, Do-Il ; Kim, Hong-Gi ; Cho, Kwang-Yun ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 74~78
Two Bacterial strains 1-C and 51-C capable of utilizing aniline as a sole source of carbon and energy were isolated from river waters. Both strains were identified as Pseudomonas rhodesiae based on their physiological and biochemical characteristics and 16S rRNA gene sequence. The strains were able to grow on the mineral salt media containing aniline at concentrations up to 6,000
. Pseudomonas rhodesiae 51-C completely degraded aniline in a mineral salt medium containing 300
of aniline as a sole carbon and energy source within 16 hours. The optimum pH and temperature for its growth and aniline degradation were 7.0 and
, respectively. This is the first report of aniline degradation by P. rhodesiae strains.
Seasonal Variations in the Concentration of Persistent Organochlorine Pesticides in Atmosphere
Chung, Rye-Pyo ; Choi, Min-Kyu ; Yeo, Hyun-Gu ; Chun, Man-Young ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 79~85
From July to November 1999, air samples were collected from Ansung, Korea, to identify the seasonal variation in organochlorine pesticides(OCPs). OCPs maximum(mean) concentrations were as follows: heptachlor,
; heptachlor epoxide,
; endosulfan sulfate,
. The higher concentration of the locally and seasonally used pesticide endosulfan[1759.2
] was found. The concentrations of all OCPs were higher in summer than those in fall. This pattern suggests that the concentrations may be increased by evaporation from surfaces(soil, water, vegetation, etc) with increasing the temperature and by much usage in growing season, particularly in summer, for endosulfan.
Effect of Duck Free-Ranging Density on Duck Behavior Patterns, and Rice Growth and Yield under a Rice-Duck Farming System in Paddy Field
Goh, Byeong-Dae ; Song, Young-Han ; Manda, Masaharu ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 86~92
The current study was conducted to elucidate the optimum density of free-ranging ducks in a rice-duck farming system in terms of effects on duck behavior, and growth and yield of rice plants. Four paddy fields were used for this experiment, with 6, 9, 12 and 15 birds per plot, respectively. Ducklings at eight days of age were free ranged in experimental paddy plots (4.0 a each) on the 9th day after the transplantation of rice plants. Ducks were kept in the plot for seventy days, at which point rice plants reached the earing stage. Foraging, moving, working, resting, diving and pecking behaviors of the ducks were observed two times during the experimental period. Also, rice plant growth and yield according to the density of ducks per plot were examined. The foraging and moving behavior of free-ranging ducks in paddy fields for 12 hours during the daytime tended to be longer in the 12-bird plot, and working behavior was significantly (P<0.01) longer in the 12-bird plot than in the other three plots. The resting behavior was significantly (P<0.01) higher in the 9- and 15-bird plots than in the 12-bird plot. The frequency of moving behavior for 6 hours during the daytime in the 15-bird plot tended to be lower than that in the other three plots, but this difference was not significant. The amount of diving and pecking behavior in the 9-bird plot was significantly (P<0.05) higher than that in the other three plots, and the number of hills pecked tended to be higher with increasing of duck density. From thirty days after ducks were introduced to the paddy fields, the length of rice plants tended to be significantly (P<0.05) shorter in high free-ranging density plots as compared to low free-ranging density plots. The number of tillers per hill was not affected by the free-ranging density. The culm length of rice plants was significantly (P<0.05) shorter in the 12- and 15-bird plots than in the other two plots, however, the duck free-ranging density did not affect panicle length. The dry weight of the root of rice plants was increased with high free-ranging density, but there was no such increase in the top parts of the rice plants. The percent of rice plants badly damaged by free-ranging density tended to be lower in the order of 12-, 9-, 6- and 15-bird plots. The number of ears, ripening grains and crop yield per hill of rice plants in the 12-bird plot were significantly (P<0.05) higher than those of the other three plots. Therefore, the yield of each rice plant per 10 a was significantly increased in the 12-bird plot.
Physiological Responses of Chilling - Tolerant and Susceptible Rice Cultivars during Chilling Stress and Subsequent Recovery
Kuk, Yong-In ; Shin, Ji-San ; Lee, Hee-Jae ; Guh, Ja-Ock ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 93~98
A chilling-tolerant japonica-type and a chilling-susceptible indica-type of rice (Oryza sativa L.) plants were compared with respect to various physiological parameters during chilling and subsequent recovery. The japonica-type and the indica-type of rice cultivars used were Ilpumbyeo and Taebaekbyeo, respectively. The two rice cultivars exhibited little or no differences in the changes of leaf fresh weight and chlorophyll content during chilling at
for 3 days. During subsequent recovery at
, however, Ilpumbyeo restored its growth more rapidly than Taebaekbyeo. Since the changes of relative water content, malondialdehyde production, an estimate of lipid peroxidation, and chlorophyll fluorescence were significantly different in the two rice cultivars during the chilling and subsequent recovery, they were found to be more sensitive physiological parameters than fresh weight and chlorophyll content. However, the differences in relation to water content, malondialdehyde production, and chlorophyll fluorescence between the two rice cultivars were smaller during chilling than those during subsequent recovery. These results suggest that relative water content, malondialdehyde production, and chlorophyll fluorescence could widely be used as important physiological parameters for screening chilling-tolerant plants.
The Characteristics of PCBs Deposition on Plants
Kim, Tae-Wook ; Yeo, Hyun-Gu ; Choi, Min-Kyu ; Chun, Man-Young ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 99~107
PCBs(Polychlorinated biphenyls) in air and plants were measured every two weeks at Hankyong University located in Ansung, Kyoung ki province from July to November in 1999. The percentage of tri-CBs(PCB 28) and tetra-CBs(PCB 52) is 49% of the total PCBs in air, which shows these two components are the major congeners. A correlation coefficient(r) of PCB congeners detected in two plants is 0.83 (p<0.01), indicating that the plants can be used as a passive sampler to indirectly estimate the pollution levels of residual PCBs in the environmental even if they have different physicochemical properties. The average ratio of PCB 110/PCB 52 is higher in plants as 0.5, 2.9 and 2.5 respectively in the air and mulberry leaves as well as scallions, which comes from the higher lipophilicity of PCB 110 rather than the ratio of PCB 110/PCB 52 in the air.
Effect of Aqueous Extracts of Rice Bran on Inhibition of Germination and Early Growth of Weeds
Kuk, Yong-In ; Shin, Ji-San ; Kwon, Oh-Do ; Guh, Ja-Ock ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 108~111
This study examined effects of aqueous extracts of rice bran on the inhibition of germination and early growth of annual weeds, barnyardgrass and eclipta. Germination of barnyardgrass treated with 5%(w/v)-sterilized and nonsterilized extracts of rice bran were inhibited by 27% and 63% at 7 days after treatment(DAT), respectively, compared to control. However, plant height and fresh shoot weight of barnyardgrass treated with aqueous extract of rice bran was reduced significantly at higher than 1% for both sterilized and nonsterilized extracts. Plant height and fresh shoot weight of barnyardgrass treated with 5% extract of rice bran were inhibited by 66 to 68% and 75 to 78% at 7 DAT, irrespective of sterilization. The germination of eclipta treated with sterilized and nonsterilized extracts of rice bran were significantly inhibited at concentrations of more than 0.5% and completely at 4% and 5%. Plant height and fresh shoot weight of eclipta affected by the rice bran extracts showed trends similar to the germination rate. The sterilization of rice bran extract resulted in higher inhibition of germination and early growth of eclipta. Rice bran extract was more inhibitory to the germination and growth of eclipta than barnyardgrass. These results suggest that aqueous extracts of rice bran may have inhibitory potential to germination and early growth of weeds.
Salt Movement of Soils by Runoff in Green House Area
Kang, Bo-Koo ; Kim, Hyun-Ju ; Lee, Kyung-Ja ; Kim, Jai-Joung ; Hong, Soon-Dal ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 112~115
Salt accumulation and movement by runoff ware studied in runoff resevior lysimeter constructed in a green house located in the area of Cheongju, Chungbuk province. Average runoff ratio of rainfall within period of this experiment was 58%. The average content of cations lost from field soil by runoff was in the order of
and in the care anions
. Amounts of salt movement by runoff
. The loss amount of
was the lowest among the anions investigated in this experiment.
was accumulated on the soil surface due to strong affinity for the sorption site on the soil particle surface.
Effect of Low Dose
Radiation on the Dormancy Breaking and Physiological Activity of "Dejima" Seed Potato (Solanum tuberosum L.)
Kim, Jae-Sung ; Kim, Dong-Hee ; Back, Myung-Hwa ; Joung, Hyouk ; Lee, Young-Bok ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 116~121
To observe the stimulating effects of low dose
- radiation on the dormancy breaking and physiological activity, potato (Solanum tuberosum L. cv. Dejima) were irradiated at the dose of
Gy. Low dose
- radiation exhibited promoting effects on the sprouting rate within the range of optimum dose of 1 Gy and 2 Gy and on the sprout length within the range of optimum dose of 2 Gy and 4 Gy. Regardless of storage duration and irradiation doses, the number of sprouts was enhanced. The number of sprouts, which were reserved for 15 days after production (DAP), were significantly increased under 4, 8 and 16 Gy irradiation. The growth of 45 DAP sprouts was extremely stimulated under 4 Gy irradiation accompanying the increase of peroxidase activity in the plantlet. In this study, it was also suggested that the activities of antioxidative enzymes of potato plantlets were not related to the irradiation dose during the plantlet development with the exception of decrease in catalase activity.
Effect of Fermented Food Wastes on the Growth Performance and Feeding Efficiency in Pig
Jung, Woo-Jin ; Son, Young-Ok ; Lim, Kye-Taek ; Kim, Yong-Woong ; Kim, Tae-Hwan ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 122~126
The effect of the fermented food wastes (FFW) on growth performance and feeding efficiency war investigated in growing-finishing pigs. Four treatments with different mixing rates [0% FFW (100% commercial diet: control) ; 25% FFW ; 50% FFW ; and 100% FFW] were tried. Twenty heads of cross-bred barrows (
, average live weight : 28.5 kg) were divided into 4 treatments with 5 replicates. During entire feeding trial (10 to 27 week), average daily gain increased by 29.4% and 13.9% in 25% FFW and 50% FFW, but decreased by 38.2% in 100% FFW compared to control. Daily feed intake was the highest in 25% FFW and it greatly decreased in 50% and 100% FFW feeding. The amount of feeds required for weight gain was similar with control in 25% FFW or significantly decreased in 50% FFW, while greatly increased in 100% FFW feeding. Cost of feeds per kg weight gain was decreased by 28.6%, 49.4% and 32.6% in 25%, 50% and 100% FFW, respectively. The results showed that replacement up to 50% with fermented food wastes was advantageous with respect to feed efficiency and feed cost, but 100% FFW feeding was disadvantageous because of a very low feed efficiency.
Soil Chemical Characteristics and Comparison with Infested Status of Nematode(Meloidogyne spp.) in Plastic House Continuously Cultivated Oriental Melon in Songju
Jun, Han-Sik ; Park, Woo-chul ;
Korean Journal of Environmental Agriculture, volume 20, issue 2, 2001, Pages 127~132
This study was conducted for ten years to evaluate the effective soil management for preventing the infection of root-knot nematode in the field of continuous cultivation with oriental melon under plastic house in Songju area of kyongbuk province. The content of available phosphate, total nitrogen, organic matter, CEC, and exchangeable base in the soil increased with the increase of continuous cultivation year. Especially salt content in the soil increased form 1.2 to 4.55 mS/cm and the yield of oriental melon dramatically decreased with the continuous cultivation year. The number of root-knot nematode was 91 per
of soil in the field of continuous cultivation for 3 years and showed slight damage on the oriental melon, but it was 518 in the field of
years continuous cultivation and showed that 50% of plants died in August, and the yield of late season was less than 50% compared to normal plant. For the seasonal changes in infection rate of root-knot nematode on oriental melon plant, 15% of the normal plant was infected by nematode in February and increased gradually by
per month, 60% of plants was infected in July. The density of root-knot nematode nymph was 167 in February and increased to 1,625 in August. The infection rate of nematode was 35%, and the number of nematode was about 54 in nursery soil originated from paddy soil, upland soil, and river sand. There were no relationship between the number of nematode and available phosphate or exchangeable base in the soil of plastichouse where oriental melon plants were grown.