Revised Soil Survey of Chungju-Si in Chungchungbukdo

현병근,손연규,전상호,윤순강,정석재,최정원,이동성 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.3

Agricultural lands have decreased continuously because of urbanization, land consolidation, road construction, etc. Especially, rapidly urbanizing areas such as Cheongju-si in South Korea has the severe land-use change. In this regard, Our study was aimed investigating land-use changes including soil properties and soil information to provide the basic soil information and soil management practices in the region. The area of crop cultivated land of South Korea in 2016 reduced by 35,424 ha compared to that of 2014. The paddy and upland field decreased by 12,455 and 22,969 ha respectively. The reasons for the decrease of the paddy field are as follows: converting the paddy field to upland (22,780 ha) > others (3,646) > public facilities (2,740) > building (2,642) > idle land (1,439). The reasons for the increase of the upland filed are as follows: switching paddy to upland (22,780 ha) > others(5,330) > reclamation of upland (1,415). The main reason converting paddy field to upland was cultivating more profitable upland crops or fruit trees. The arable land in Chungju-si had been reduced by 1,087 ha in 2014 since 1999. The ratio of the reduced arable land was about 48%. Our results showed that paddy fields located in alluvial plains were changed into upland or green house. In particular, paddy fields have been changed to not only upland, orchard, greenhouse cultivation but also fallow land. Moreover, our research using 3686 soil codes (soil phases) and 3834.2ha indicated that the number of soil series and soil phase increased to 74 and 160 from 65 and 126 individually. The largest increased area was Sachon (coarse loamy fluvaquentic endoaquepts) soil series 536.3ha which were modified from the existing Yecheon, Sanju, Wolgog, and Seongsan soil series.

FAO의 세계토양정보 구축과 대응

현병근,이덕배 한국농촌경제연구원 2015 세계농업 Vol.175 No.-

Revised Soil Survey of Gimpo City in Gyeonggido

현병근,손연규,전상호,윤순강,고우리,정석재,최정원 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.2

Agricultural lands have decreased continuously because of urbanization, land consolidation, road construction, etc. Especially, rapid urbanizing areas such as Gimpo-city in South Korea has the severe land-use change. In this regard, aim of our study was to investigate land-use changes including soil properties and soil information to provide the basic soil information and soil management practices in the region. The arable land in Gimpo-city had been reduced by 47,121 ha in 2017 since 1999. The ratio of the reduced arable land was about 22.1%. Our results showed that paddy fields located in alluvial plains were changed into upland or green house. In particular, paddy fields have been changed to not only upland, orchard, greenhouse cultivation but also fallow land. Moreover, our research using 462 soil codes (soil phases) and 1207.3 ha indicated that the number of soil series and soil phase increased to 47 and 79 from 43 and 74 individually. The largest increased area was Mangyeong (coarse silty, mixed, mesic family of Fluvaquentic Endoaquepts) soil series 418.3 ha which were modified from the existing Jeongbug and Chunpo soil series.

Estimation of Soil Organic Matter Content Using Soil Organic Color Chart and Soil Color Meter SPAD 503

현병근,이예진,류철현 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.1

Soil organic matter (SOM) is one of the most representative indicators of soil fertility. In order to quicklyestimate the SOM content through soil color in the field, a soil color chart (AG-1941-Color Chart, Universityof Illinois Extension, USA) and soil color meter (SPAD 503) were used. The results are summarized asfollows. A total of 173 soil samples were analyzed, of which 78 were paddy soil and 95 upland soil (includingplastic film house soil). The soil color mater was more useful than the soil color chart in estimating the SOMcontent. The coefficient of determination of the regression equation for estimating soil organic matter contentusing the soil color chart was 0.5857*** for upland soil, 0.5460*** for all soil, and 0.3499*** for paddy soil. In the case of upland soils, estimating the SOM content using regression model of upland soil had higherestimating power than using regression equation of all soils. The coefficient of determination of the regressionequation for estimating soil organic matter content using a soil color meter was higher in the model divided(R2= 0.9537***) in to paddy and upland soil than in all soil model (R2= 0.7738***). When the highest valueof SOM content used for model validation was excluded, the coefficient of determination of the existingmodel was reduced, but the trend was the same. When using the soil color meter, the all soil model decreasedfrom 0.9029 to 0.5723, and from 0.9095 to 0.6879 when dividing the paddy and upland soils. Also, whenusing the soil color chart, the all soil model was reduced from 0.5246 to 0.2111, and when dividing the paddyand upland soil from 0.5987 to 0.1863.

토양 물리성과 직파 (直播) 벼의 초기생육과의 관계

현병근,조현준,이협성,조인상,엄기태 한국응용생명화학회 1993 한국응용생명화학회 학술발표회 Vol.1993 No.-

토양이화학성이 밭토양 입단함량에 미치는 영향

현병근,고문환,윤홍배,송기수,김무성 한국토양비료학회 2001 한국토양비료학회 학술발표회 초록집 Vol.2001 No.5

Australian Soil Classification: an Review

현병근,손연규,조현준,정강호,최정원,정석재,곽우리,김운선,홍세은 한국토양비료학회 2016 한국토양비료학회지 Vol.50 No.4

As a means of improving Korean Soil Classification System, we have reviewed Australian Soil Classification System by comparing Soil Taxonomy and FAO/WRB Classification System. Australian Soil Classification System is composed of 14 of Order, 87 of Sub-order, 556 of Great-group, 2,451 of Sub-group, and 7,276 of Family. Interestingly, soil order has the Anthroposols which is not classified with Soil Taxonomy, and the classification for some of soils is based on soil texture abruption horizon and soil structure. Seven of 14 soil orders are classified with an old version based on soil color rather than morphological characteristics. The distribution scale of Australian soil order is the largest in Tenosols, and followed by Kandosols, Rudosols, Sodosols and Vertisols in Australia.

The Study on Soil Classification in Sri Lanka

현병근,R. B. Mapa,손연규,조현준,신국식,최정원,정석재,장병춘 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.3

Land information is important for the international agricultural companies. This study investigated the agriculture and soil information in Sri Lanka. This study is the results from investigation of soil properties and agricultural properties determined by the Soil Taxonomy classification system for the soils in Sri Lanka. The order of the main agricultural imports in Sri Lanka was wheat > refined Sugar > dry Onion > Rice > Lentils. The climate of Sri Lanka is divided into three climatic zones. There are a wet zone, an intermediate zone, and a dry zone. Rainfall of the wet zone was 3,000-5,000mm year -1 . The rainfall of the dry zone was less than 1,000m -1 . The intermediate zone was in the middle area. Soil series of Sri Lanka were 109 in total. Detailed information of soil series was: 6 of soil Orders, 15 of Suborders, 39 of Great groups, and 56 of Subgroups. Soil texture of topsoil was much more coarse, but subsoil was gravelly coarse soil. Soil of Sri Lanka was classified as a Soil Order. The orders were Entisols > Alfisols > Ultisols > Inceptisols > Histosols > Vertisols.

Revised Soil Survey of Yangju City in Gyunggido

현병근,손연규,김근태,조현준,정석재,최정원 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.2

Recently, agricultural lands have decreased sharply, which was caused by huge housing site, urbanization, landconsolidation, and road construction etc. In particular, Yangju city near Seoul city has the most severe land usechange in Korea. Therefore, we analyzed changes of land use, soil properties, and soil information in order toprovide the basic soil information and soil management practices in this city. The area of crop cultivated land inKorea (2015) reduced by 12,090 ha compared to ones from the previous year (2014). The paddy field decreasedby 25,421 ha but, upland field increased by 13,331 ha. One of the reasons for the reduction of the paddy field wasconverting paddy field to upland (20,916 ha) > others (3,056) > building (2,571) > public facilities (847) > idleland (217). But, reasons for increase of upland field were switching paddy to upland (20,916 ha) > land developed(634). The main reason of converting paddy field to upland was changing from rice to more profitable specialitycrops or pulses. The cropland area (paddy fields, upland, orchard) of Yangju city reduced by 1,412 ha(2015/2014). The ratio of cropland area in each city reduced by 22.9% dramatically compared 2015 to 1999. Thepaddy fields located in alluvial plains in Yangju city were changed into upland or green house. The drainageclasses of soil have been deteriorated because the flows of water were intercepted by road construction and otherdisturbance to water flows. In particular, paddy fields have been changed to not only upland, orchard, greenhousecultivation but also to fallow and soil dressing on paddy in Yangju city. To analyze result of soil survey of Yangjucity, 858 soil codes (soil phases) were used and the area was 105.17ha. The number of soil series increased from60 to 65, and that of soil phase increased from 105 to 124. The largest increased area was Noegog soil series. 125.7ha of Neogog soil series was incorporated from the existing Sachon, Yecheon and Eungog soil series. Thesoil suitability class of paddy field in Ogjung huge housing site of Yangju city was the 4th grade for 32.6% of thearea. The soil suitability classes of upland were 2nd and 3rd grade for 72.4% of the area. Farm land with highquality should be conserved by related law.

토양이화학성이 밭토양 입단함량에 미치는 영향

현병근,고문환,윤홍배,송기수,김무성 한국토양비료학회 2001 한국토양비료학회 학술발표회 Vol.2001 No.-