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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 33, Issue 4 - Dec 2014
Volume 33, Issue 3 - Sep 2014
Volume 33, Issue 2 - Jun 2014
Volume 33, Issue 1 - Mar 2014
Selecting the target year
Effects of Various Amendments on Heavy Metal Stabilization in Acid and Alkali Soils
Kim, Min-Suk ; Min, Hyungi ; Kim, Jeong-Gyu ; Koo, Namin ; Park, Jeong Sik ; Bak, Gwan In ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 1~8
DOI : 10.5338/KJEA.2014.33.1.1
BACKGROUND: Recent studies using many amendments for heavy metal stabilization in soil were conducted in order to find out new materials. But, the studies accounting for the use of appropriate amendments considering soil pH remain incomplete. The aim of this study was to investigate the effects of initial soil pH on the efficiency of various amendments. METHODS AND RESULTS: Acid soil and alkali soil contaminated with heavy metals were collected from the agricultural soils affected by the abandoned mine sites nearby. Three different types of amendments were selected with hypothesis being different in stabilization mechanisms; organic matter, lime stone and iron, and added with different combination. For determining the changes in the extractable heavy metals, water soluble, Mehlich-3, Toxicity Characteristic Leaching Procedure, Simple Bioavailability Extraction Test method were applied as chemical assessments for metal stabilization. For biological assessments, soil respiration and root elongation of bok choy (Brassica campestris ssp. Chinensis Jusl.) were determined. CONCLUSION: It was revealed that lime stone reduced heavy metal mobility in acid soil by increasing soil pH and iron was good at stabilizing heavy metals by supplying adsorption sites in alkali soil. Organic matter was a good source in terms of supplying nutrients, but it was concerning when accounting for increasing metal availability.
Seasonal Soil and Foliar Nutrient Concentrations, and Fruit Quality in a Pesticide-Free Pear Orchard as Affected by Seeding Timing and Method of Cover Crops
Lim, Kyeong-Ho ; Choi, Jin-Ho ; Kim, Wol-Soo ; Kim, Hyun-Ji ; Song, Jang-Hoon ; Cho, Young-Sik ; Yim, Sun-Hee ; Jung, Seok-Kyu ; Choi, Hyun-Sug ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 9~16
DOI : 10.5338/KJEA.2014.33.1.9
BACKGROUND: This study was conducted to investigate the effects of seeding timing and method of rye and/or hairy vetch on seasonal soil and foliar nutrient concentrations as well as fruit quality in a pesticide-free pear orchard. METHODS AND RESULTS: The treatments included as followed: single seeding of rye in September (Sep-Mono), November (Nov-Mono), and January (Jan-Mono), or mix seeding of rye+hairy vetch in November (Nov-Mix) and January (Jan-Mix), or sod culture as a control. Cover crops or vegetation was mown and mulched on the soil surface in April and May for two years. Nov-Mix treatment produced the highest dry matter weight of
, with the lowest dry matter weight for sod culture (
), following Jan-Mix (
). Nov-Mix treatments increased potential amount of N, P, and K from the raw materials of the cover crops as well as improved soil physical properties. Nov-Mix treatments overall elevated soil pH, EC, organic matter, and
in May compared to other cover crop treatments or sod culture. The difference of the seasonal nutrient concentrations in leaves or fruit qualities were not consistently occurred amongst treatments. CONCLUSION: Nov-Mix treatments showed playing role in a substitute of a chemical fertilizer. Delayed seeding of cover crops such as Jan-Mix did not increase the potential dry matter production due to the short growing period, and the seeding time would affect the dry matter production of cover crops.
Effect of Double-Cropping Systems on Nematode Population in Plastic Film House Soils of Oriental Melon Cultivation
Byeon, Il-Su ; Suh, Sun-Young ; Lee, Yong-Se ; Chung, Jong-Bae ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 17~23
DOI : 10.5338/KJEA.2014.33.1.17
BACKGROUND: Crop rotation is often used as a solution to eradicate nematodes in soils used in plastic film houses for long-term cultivation of oriental melon. However, it is not clear if the double-cropping is effective in reducing nematode populations in soils. METHODS AND RESULTS: Nematode population in plastic film house soil was measured during oriental melon cultivation from April to July in short term crop rotation systems of oriental melon. Double-cropping of chinese cabbage in open-field for 3-4 months following oriental melon in plastic film houses could not prevent the build-up of high population density of nematodes. However, double-cropping of dropwort in flooded soil for 3-4 months following oriental melon in plastic film houses could effectively reduce the nematode population during the successive year of oriental melon cultivation. The reduced nematode population in soils of oriental melon-dropwort double-cropping system was continued until the mid season of progressive year oriental melon cultivation. Application of nematicide to soil before growing oriental melon in the oriental melon-dropwort double-cropping was very effective in preventing the build-up of high population density of nematode in plastic film house soils. CONCLUSION: Short-term introduction of crop rotation was not effective in suppression of high population density of nematodes in plastic film house soils of long-term year-to-year production of oriental melon. For securing the soil productivity and sustainability of plastic film house, various physical, chemical, and agronomic practices should be properly combined together.
Investigation of Chemical Properties of the Jujube Orchard Soils at Boeun Region in Chungbuk
Lee, Gyeong-Ja ; Kang, Bo-Goo ; Kim, Ki-Sik ; Kim, Ik-Hwan ; Han, Jong-U ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 24~29
DOI : 10.5338/KJEA.2014.33.1.24
BACKGROUND: Recently, as the consumption of fresh jujube is increased, fertilizer in jujube cultivation is excessively used to supply nutrient for large fruit produce. This study was conducted to obtain the useful data related to optimum nutrient management technique for fresh jujube cultivation. METHODS AND RESULTS: Nutrient contents of the jujube orchard soils were investigated at 30 different jujube orchards in Boeun, Chungbuk. Soil samples were collected from the different orchards in June, both 2012 and 2013. Soil chemical properties such as pH, organic matter, available phosphate, and exchangeable potassium, calcium, and magnesium were analyzed. Soil available phosphates in optimum level for jujube cultivation were 7% and 13% of total samples in the 2011 and 2012 respectively, and 73% and 57% were higher than optimum level. In Exchangeable K, 37%, 30% were optimum level, 63%, 67% were higher in the year 2011 and 2012 respectively. CONCLUSION: These results showed that nutrient contents of soils were accumulated in jujube orchard of Boeun area. Especially, available phosphate and exchangeable potassium were greatly higher than their optimum level for jujube cultivation respectively.
Application and Effectiveness Analysis of SWAT Filter Strip in Golji Watershed
Park, Youn Shik ; Kwon, Jae Hyouk ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 30~36
DOI : 10.5338/KJEA.2014.33.1.30
BACKGROUND: Best management practices are often implemented to control nonpoint source pollutants. Best management practices need to be simulated and analyzed for effective Best management practices implementations. Filter strip is one of effective Best management practices in agricultural areas. METHODS AND RESULTS: Soil and Water Assessment Tool model was selected to explore the effectiveness of filter strip to control total phosphorous in Golji watershed. Soil and Water Assessment Tool model was calibrated for flow and total phosphorous by Sequential Uncertainty Fittin ver.2 algorithm provided in Soil and Water Assessment Tool-Calibration and Uncertainty Procedures. Three scenarios defined by filter strip width were applied. The filter strip width of 5 m was able to reduce the most amount of total phosphorous. In other words, the total phosphorous reduction by filter strip of 5 m was 28.0%, while the reduction was 17.5% by filter strip of 1 m. However, the reduction per unit filter strip width were 17.4%, 8.0%, and 4.5% for 1 m, 3 m, and 5 m of filter strips, respectively. CONCLUSION: Best management practices need to be simulated and analyzed so that the BMP scenario can be cost-effective. A large size of BMP might be able to control large amount of pollutants, however it would not be indicated as a cost-effective strategy.
Estimation of Pollutant Load Using Genetic-algorithm and Regression Model
Park, Youn Shik ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 37~43
DOI : 10.5338/KJEA.2014.33.1.37
BACKGROUND: Water quality data are collected less frequently than flow data because of the cost to collect and analyze, while water quality data corresponding to flow data are required to compute pollutant loads or to calibrate other hydrology models. Regression models are applicable to interpolate water quality data corresponding to flow data. METHODS AND RESULTS: A regression model was suggested which is capable to consider flow and time variance, and the regression model coefficients were calibrated using various measured water quality data with genetic-algorithm. Both LOADEST and the regression using genetic-algorithm were evaluated by 19 water quality data sets through calibration and validation. The regression model using genetic-algorithm displayed the similar model behaviors to LOADEST. The load estimates by both LOADEST and the regression model using genetic-algorithm indicated that use of a large proportion of water quality data does not necessarily lead to the load estimates with smaller error to measured load. CONCLUSION: Regression models need to be calibrated and validated before they are used to interpolate pollutant loads, as separating water quality data into two data sets for calibration and validation.
Understanding Spatial Variations of Water Quality Using Agricultural Nutrient Indices in Chonnam Province
Jeon, Byeong-Jun ; Lim, Sang-Sun ; Lee, Kwang-Seung ; Lee, Se-In ; Ham, Jong-Hyun ; Yoo, Sun-Ho ; Yoon, Kwang-Sik ; Choi, Woo-Jung ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 44~51
DOI : 10.5338/KJEA.2014.33.1.44
BACKGROUND: Water quality of rural areas are susceptible to agricultural nutrient input and supply such as chemical fertilizer and livestock manure. This study was conducted to evaluate the usefulness of nutrient (N and P) indices in understanding spatial variations of water quality across Chonnam province which is a typical agricultural region in Korea. METHODS AND RESULTS: The nutrient indices including chemical fertilizer supply, livestock manure production, and nutrient balance were correlated with water quality data (T-N, T-P, BOD, and COD) for the twenty-two districts of the province. Concentration of T-N were positively correlated with chemical fertilizer supply, livestock manure N production, and nutrient balance (P<0.05 or P<0.01). Meanwhile, T-P concentration was not correlated with these nutrient indices; however, there was a tendency that T-P concentration increases with livestock manure P production (P=0.06) and with nutrient balance (P=0.09). These results suggest that T-N concentration is susceptible to both chemical fertilizer and livestock manure; whereas T-P is likely to be affected by livestock manure rather than chemical fertilizer. The concentrations of BOD and COD were also positively (P<0.05 or P<0.01) correlated with livestock manure production. CONCLUSION: This study shows the usefulness of nutrient indices in understanding spatial variations of water quality and suggests that livestock manure rather than chemical fertilizer can be a more critical water pollution source and thus highlights the need for more attention to livestock manure treatments for rural water quality management.
An Analysis of Impacts of Climate Change on Rice Damage Occurrence by Insect Pests and Disease
Jeong, Hak-Kyun ; Kim, Chang-Gil ; Moon, Dong-Hyun ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 52~56
DOI : 10.5338/KJEA.2014.33.1.52
BACKGROUND: It is known that impacts of climate change on damage occurrence by insect pests and diseases are increasing. The negative effects of climate change on production will threaten our food security. It is needed that on the basis of analysis of the impacts, proper strategies in response to climate change are developed. METHODS AND RESULTS: The objective of this paper is to estimate impacts of climate change on rice damage occurrence by insect pests and diseases, using the panal model which analyzes both cross-section data and time series data. The result of an analysis on impacts of climate change on rice damage occurrence by pest insect and disease showed that the damage occurrence by Rice leaf roller and Rice water weevil increased if temperature increased, and damage occurrence by Stripe, Sheath blight, and Leaf Blast increased if precipitation(or amount of sunshine) increased(or decreased). CONCLUSION: Adaptation strategies, supplying weather forecasting information by region, developing systematical strategies for prevention of damage occurrence by pest insect and disease, analyzing the factors of damage occurrence by unexpected pest insect and disease, enforcing international cooperation for prevention of damage occurrence are needed to minimize the impacts of damage occurrence on rice production.
Fruit Characteristics Based on Leaf to Fruit Ratio in 'Pione' Grapevine (Vitis vinifera × V. labrusca) during Cultivation with Heating
Yun, Seok Kyu ; Park, Seo Jun ; Jung, Sung Min ; Kim, Jung Bae ; Yoon, Ik Koo ; Nam, Eun Young ; Yu, Duk Jun ; Lee, Hee Jae ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 57~62
DOI : 10.5338/KJEA.2014.33.1.57
BACKGROUND: Defoliation in grapevine cultivation is practically used to improve light environment within the canopy and thereby fruit quality. Effects of defoliation in five-year-old 'Pione' grapevine during cultivation with heating were investigated to find out optimum ratio of leaf area to fruit cluster weight (L/F). METHODS AND RESULTS: The grapevines were defoliated with berry-thinning 20 days after full bloom to provide various levels of L/F. At harvest, total leaf area values of fruit bearing branches were between 0.23 and
. With increasing L/F, soluble solids and anthocyanin contents curvilinearly increased (
). At L/F over
, soluble solids content (SSC) leveled off. With increasing L/F, titratable acidity (TA) linearly decreased (
), but the ratio of SSC to TA linearly increased (
). Anthocyanin content was significantly correlated with SSC and the ratio of SSC to TA (
, respectively). When total leaf area per fruit bearing branch was maintained
, soluble solids and anthocyanin contents linearly decreased (
, respectively), but TA linearly increased with increasing fruit cluster weight (
). Fruit was low in quality when the L/F was below
. CONCLUSION: L/F is recommended to be maintained at least
in 'Pione' grapevine during cultivation with heating to produce higher-quality fruits.
An Investigation on the Recognition of Biosafety Regulation Systems for the Living Modified Organism
Rho, Young-Hee ; Hong, Jeong-Yoo ;
Korean Journal of Environmental Agriculture, volume 33, issue 1, 2014, Pages 63~67
DOI : 10.5338/KJEA.2014.33.1.63
BACKGROUND: The present study is an exploratory research to establish national biosafety regulation systems through a survey on the recognition of safety regulation systems for the living modified organism(LMO). METHODS AND RESULTS: We have conducted a survey on an awareness of LMO safety regulation systems in scientific working groups. The data of 235 respondents were analyzed using various statistical methods. As a result, 72.8% of the respondents were male; 27.2% were female, and 43.4% of them work in the university. A total of 33.2% of the respondents majored in general biology, and their most common job position was the laboratory safety manager. The difference of an awareness on LMO law and regulatory system was not statistically significant by either work places or job positions. CONCLUSION: For the rapid settlement and the efficient implementation of LMO safety management policy, we conclude that it is required to reduce the gap between the recognition and fulfillment of safety management. Furthermore, the mutual exchanges of information among researchers are needed with the settlement of the safety management system and the harmony of policy with improvement of the absurd regulations. The ongoing and specialized training, inspections, and the strengthening of public relations are also required along with the efforts to improve the absurd regulations.