휴경기 후작물 재배에 의한 참외 장기연작 비닐하우스 토양의 제염 효과

변일수 ( Il Su Byeon ),정종배 ( Jong Bae Chung ) 한국환경농학회 2015 한국환경농학회지 Vol.34 No.4

BACKGROUND: During the off-season, the cultivation of Chinese cabbage and water dropwort is often used to desalinize plastic film house soils. The objective of this study was to verify the effect of double-cropping systems on the salt removal in oriental melon cultivated plastic film house soils.METHODS AND RESULTS: Electrical conductivity (EC)and soluble salt contents were measured in soils collected from plastic film houses of oriental melon cultivation before and after the off-season crop cultivation. Also the same measurements were performed in the next oriental melon season to estimate the desalinization effect of double-cropping systems. During the cultivation of Chinese cabbage under open-field condition, ECe of surface soil was reduced from 6.0 to 0.8 dS/m. Double-cropping of water dropwort in flooded soil was also efficient in removing the salts accumulated during oriental melon cultivation. In the house soils where salts were removed during the off-season crop cultivation, soil ECe was maintained below 3 dS/m during the next oriental melon cultivation season.CONCLUSION: The off-season cropping under open-field or flooded condition was effective in desalinization of plastic film house soils. Since the salt removal effect is not expected to last for several years, the double-cropping system should be introduced every season to maintain soil EC below the critical level.

Effect of Subsurface Drainage Systems on Soil Salinity at Saemangeum Reclaimed Tidal Land

이상훈,배희수,이수환,오양열,류진희,고종철,홍하철,김용두,김선림 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6

Soil salinity is the most critical factor for crop production at reclaimed tidal saline soil. Subsurface drainage system is recognized as a powerful tool for the process of desalinization in saline soil. The objective of this study was to investigate the effects of subsurface drainage systems on soil salinity and corn development at Saemangeum reclaimed tidal saline soil. The field experiments were carried out between 2012 and 2014 at Saemangeum reclaimed tidal land, Buan, Korea. Subsurface drainage was installed with four treatments: 1) drain spacing of 5 m, 2) drain spacing 10 m, 3) double layer with drain spacing 5 m and 10 m, and 4) the control without any treatment. The levels of water table showed shorter periods above 60 cm levels with the deeper installation of subsurface drainage system. Water soluble cations were significantly greater than exchangeable forms and soluble Na contents, especially in surface layer, were greatly reduced with the installation of subsurface drainage system. Subsurface drainage system improved biomass yield of corn and withering rate. Thus, the biomass yield of corn was improved and the shoot growth was more affected by salinity than was the root growth. The efficiency of double layer was not significant compared with the drain spacing of 5 m. The economic return to growers at reclaimed tidal saline soil was the greatest by the subsurface drainage system with 5 m drain spacing. Our results demonstrated that the installation of subsurface drainage system with drain space of 5 m spacing would be a best management practice to control soil salinity and corn development at Saemangeum reclaimed tidal saline soil.

Effect of Subsurface Drainage Systems on Soil Salinity at Saemangeum Reclaimed Tidal Land

Lee, Sanghun,Bae, Hui-Su,Lee, Soo-Hwan,Oh, Yang-Yeol,Ryu, Jin-Hee,Ko, Jong-Cheol,Hong, Ha-Chul,Kim, Yong-Doo,Kim, Sun-Lim 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6

Soil salinity is the most critical factor for crop production at reclaimed tidal saline soil. Subsurface drainage system is recognized as a powerful tool for the process of desalinization in saline soil. The objective of this study was to investigate the effects of subsurface drainage systems on soil salinity and corn development at Saemangeum reclaimed tidal saline soil. The field experiments were carried out between 2012 and 2014 at Saemangeum reclaimed tidal land, Buan, Korea. Subsurface drainage was installed with four treatments: 1) drain spacing of 5 m, 2) drain spacing 10 m, 3) double layer with drain spacing 5 m and 10 m, and 4) the control without any treatment. The levels of water table showed shorter periods above 60 cm levels with the deeper installation of subsurface drainage system. Water soluble cations were significantly greater than exchangeable forms and soluble Na contents, especially in surface layer, were greatly reduced with the installation of subsurface drainage system. Subsurface drainage system improved biomass yield of corn and withering rate. Thus, the biomass yield of corn was improved and the shoot growth was more affected by salinity than was the root growth. The efficiency of double layer was not significant compared with the drain spacing of 5 m. The economic return to growers at reclaimed tidal saline soil was the greatest by the subsurface drainage system with 5 m drain spacing. Our results demonstrated that the installation of subsurface drainage system with drain space of 5 m spacing would be a best management practice to control soil salinity and corn development at Saemangeum reclaimed tidal saline soil.

새만금 간척지 포화상태 흙의 제염예측기법 개발

서동욱,김현태,장병욱,이상훈,Seo, Dong-Uk,Kim, Hyeon-Tae,Chang, Pyoung-Wuck,Lee, Sang-Hun 한국농공학회 2009 한국농공학회논문집 Vol.51 No.2

A series of laboratory model tests and numerical analysis is performed to analyze characteristics of desalination and to predict a period of desalination for subsurface saturated soil in Saemanguem reclaimed area. The results show that quantity of desalination is small as salinity of water is increased. On the contrary, quantity of desalination is increased as salinity of soil is high. In order to decrease the salinity to 10 % of initial salinity of soil at depth of 2 m, it takes 11 years to desalinate the soil 50 m away from drainage ditch. For soil at depth of 1.5 m only 1 year to desalinate the soil near drainage ditch. Also, water head of 80 cm is required to desalinate to 10 % of initial salinity for 60 cm thick soil. Because the following results is based upon the Saemangeum soil, an application of this result for another field will be cautious. More research will be required on this matter.

Effect of Subsurface Drainage Systems on Soil Salinity at Saemangeum Reclaimed Tidal Land

Sanghun Lee,Hui-Su Bae,Soo-Hwan Lee,Yang-Yeol Oh,Jin-Hee Ryu,Jong-Cheol Ko,Ha-Chul Hong,Yong-Doo Kim,Sun-Lim Kim 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6

Soil salinity is the most critical factor for crop production at reclaimed tidal saline soil. Subsurface drainage system is recognized as a powerful tool for the process of desalinization in saline soil. The objective of this study was to investigate the effects of subsurface drainage systems on soil salinity and corn development at Saemangeum reclaimed tidal saline soil. The field experiments were carried out between 2012 and 2014 at Saemangeum reclaimed tidal land, Buan, Korea. Subsurface drainage was installed with four treatments: 1) drain spacing of 5 m, 2) drain spacing 10 m, 3) double layer with drain spacing 5 m and 10 m, and 4) the control without any treatment. The levels of water table showed shorter periods above 60 cm levels with the deeper installation of subsurface drainage system. Water soluble cations were significantly greater than exchangeable forms and soluble Na contents, especially in surface layer, were greatly reduced with the installation of subsurface drainage system. Subsurface drainage system improved biomass yield of corn and withering rate. Thus, the biomass yield of corn was improved and the shoot growth was more affected by salinity than was the root growth. The efficiency of double layer was not significant compared with the drain spacing of 5 m. The economic return to growers at reclaimed tidal saline soil was the greatest by the subsurface drainage system with 5 m drain spacing. Our results demonstrated that the installation of subsurface drainage system with drain space of 5 m spacing would be a best management practice to control soil salinity and corn development at Saemangeum reclaimed tidal saline soil.

Effects of Subsurface Drainage System on Soil Salinity at Reclaimed Tidal Land

김영주 ( Young-joo Kim ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

Soil salinity is the most critical problem at reclaimed tidal saline soil and the subsurface drainage systems is recognized as a powerful tool for the process of desalinization in salt-affected soil. The objective of this study was to investigate the effects of subsurface drainage system on soil salinity at reclaimed tidal saline soil. The field experiments were carried out from October 2014 to October 2016 at Saemangeum reclaimed tidal land. Subsurface drainage was installed with four designs: SL5 drain spacing of 5m; SL10 drain spacing 10m; DL double layer with drain spacing 5m and 10m; and the control without subsurface drainage treatment. The level of water table was reduced with the installation of subsurface drainage system. Soil salinity was significantly reduced by subsurface drainage system, especially in surface layer. Water soluble cations were significantly greater compared to exchangeable forms and soluble Na contents were greatly reduced in surface layer with the installation of subsurface drainage system. Corn had the greater biomass yield compared to the untreated control and withering rate were also improved. Thus, the biomass yield of corn was improved and the shoot growth was significantly affected by salinity than was the root growth. Our results demonstrated that the installation of subsurface drainage system with drain space of 5m interval would be a best management practice to control soil salinity at reclaimed tidal saline soil.

입지조건이 다른 시설재배지에서 담수처리에 따른 양분 용탈량 평가

김민경(Min-Kyeong Kim),노기안(Kee-An Roh),고병구(Byong-Gu Ko),박성진(Seong-Jin Park),정구복(Goo-Bok Jung),이덕배(Deog-Bae Lee),김철수(Chul-Soo Kim) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.3

Greenhouse soil cultivated with excessive compost and chemical fertilizer has been an issue to deteriorate soil and water quality in the environment. The objective of this study was to evaluate the nutrient outflow by desalting method, flooding soil surface, after vegetable cropping in greenhouse soils. Field experiment from July to September 2008, was conducted to quantify greenhouse locations, i.e. alluvial plain and local valley. The changes of desalinization in both locations were higher as the amounts of irrigated and drained water were increased. Particularly, the ratio of desalinization in alluvial plain was much higher (66.7%) than the one in local valley (45.6%). However, NH₄-N contents of local valley soil during the flooding were higher than in those of alluvial plain. This was caused by high total nitrogen and organic matter in local valley soil than those in alluvial plain soil. With comparing to the input and output loads of T-N and T-P in greenhouses with local valley and alluvial plain soils, the output loads of nutrients were larger than the input loads of nutrients. This result showed that the flooding soil surface can be a good treatment to desalinize greenhouse soils. However, this conclusion remained that the flooding water containing high N and P concentrations might cause the secondary effect on the quality of streams and groundwater since excessive nutrient concentrations can be the main cause of eutrophication problem in aquatic environment.

간척지 흙의 암거 설치조건에 따른 제염 특성의 이론적 해석

김현태,서동욱,류찬호,김석열,Kim, Hyuntai,Seo, Donguk,Yoo, Chanho,Kim, Seogyeol 한국농공학회 2015 한국농공학회논문집 Vol.57 No.3

Cultivation on reclaimed tidal land is often difficult in the problem such as high salinity of soil, bad drainage because of high level of groundwater. Many researches have been made efforts to solve these problems, but effect of improvement is low and practicality is insufficient. In this study, through numerical analysis of the transport properties of salt and water, we suggested underground drainage of the reclaimed land and the desalination promotion methods in the soil. The results of characteristic of desalination and seepage analysis of underdrain show that underdrain is able to increase twice of the underground seepage amount when installing perforated pipe with horizontal filter (width 50cm) more than installing only the perforated pipe. For soil which coefficient of permeability is below $1{\times}10^{-4}cm/s$ that desalination with pond water is not possible, a method to increase the permeability of the soil is necessary. Therefore, it was concluded that application of underdrain using perforated pipe with horizontal filter would be low-cost and practical.

배수불량 간척지에서 배수처리가 제염 및 작물생육에 미치는 영향

배희수,이수환,황재복,박홍규,이건휘,이경보,이교석,이동성,홍병덕,이자현,정덕영 한국국제농업개발학회 2016 韓國國際農業開發學會誌 Vol.28 No.4

To determine the effect of soil salinity and crop response according to drainage methods, a field experiment was conducted in reclaimed tidal flat land adjacent to Yeongsangang located at Sanyimyon Haenamgun Jeonnam province for three years from 2012 to 2014. Three drainage methods, subsurface drainage (SD), 30 cm open ditch drainage (OD30) and 60cm open ditch drainage (OD60) tested on silt loam soil. In SD and ND, soil salinity were lower than OD30 and OD60 but there was no significant soil EC to the depth of open ditch. SD had a little effect in lowering ground water table. Waterlogging intensity in SEW30 values during the growing season was the lowest in SD 297 compared with the OD30 855, ND 1,420 and OD60 1,553 cm-day. From the above results, subsurface drainage system control soil salinity and waterlogging. Also, the open ditch drainage had an effect on drainage improvement but there was no significant effect on desalinization. So drainage and soil reclamation were essentially needed to stable upland crop cultivation at the reclaimed tidal flat land.

Designer carbon nanotubes for contaminant removal in water and wastewater: A critical review

Sarkar, Binoy,Mandal, Sanchita,Tsang, Yiu Fai,Kumar, Pawan,Kim, Ki-Hyun,Ok, Yong Sik Elsevier BV 2018 Science of the Total Environment Vol.612 No.-

<P><B>Abstract</B></P> <P>The search for effective materials for environmental cleanup is a scientific and technological issue of paramount importance. Among various materials, carbon nanotubes (CNTs) possess unique physicochemical, electrical, and mechanical properties that make them suitable for potential applications as environmental adsorbents, sensors, membranes, and catalysts. Depending on the intended application and the chemical nature of the target contaminants, CNTs can be designed through specific functionalization or modification processes. Designer CNTs can remarkably enhance contaminant removal efficiency and facilitate nanomaterial recovery and regeneration. An increasing number of CNT-based materials have been used to treat diverse organic, inorganic, and biological contaminants. These success stories demonstrate their strong potential in practical applications, including wastewater purification and desalination. However, CNT-based technologies have not been broadly accepted for commercial use due to their prohibitive cost and the complex interactions of CNTs with other abiotic and biotic environmental components. This paper presents a critical review of the existing literature on the interaction of various contaminants with CNTs in water and soil environments. The preparation methods of various designer CNTs (surface functionalized and/or modified) and the functional relationships between their physicochemical characteristics and environmental uses are discussed. This review will also help to identify the research gaps that must be addressed for enhancing the commercial acceptance of CNTs in the environmental remediation industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CNTs can be designed through specific functionalization or modification process. </LI> <LI> Designer CNTs can enhance contaminant removal efficiency. </LI> <LI> CNTs can facilitate recovery and regeneration of nanomaterials. </LI> <LI> CNTs hold potential applications in wastewater purification and desalination. </LI> <LI> Further research is needed to enhance commercial acceptance of CNTs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>