• 한국작물학회지
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• 제45권5호
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• pp.282-287
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• 2000

Soybean [Glycine max (L.) Merrill] crops, grown in a rice soybean rotation, can suffer when grown in soil with excessive moisture. The objective of this work were to determine the reduction in growth and yield, responses of vegetative and reproductive growth of soybean to excessive soil moisture achieved by prolonged irrigation. Responses of different cultivars were determined at growth stages from V6 to R8 to clarify the sensitive growth stages or characteristics to excessive soil moisture. Cultivar differences in response to excessive soil moisture condition were conspicuous in seed dry weight and harvest index (HI) but not in the response of seed number or pod number per plant. The timing of irrigation causing the condition of excessive soil moisture influenced the vegetative or reproductive traits. Soybean plants were more affected by irrigation commencing at the pre-flowering than at the post-flowering stage. Post-flowering irrigation did not reduce growth of vegetative organs significantly; in fact the growth of stems and leaves was facilitated by the prolonged irrigation commencing at flowering. Differences between cultivar response to prolonged irrigation were assumed to relate to the reduced amount of assimilates translocated to the reproductive organ.

• 한국토양비료학회지
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• 제44권5호
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• pp.722-726
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• 2011

The management standard on soil conditions in 'Fuji' apple to produce high quality fruit were not yet made. Therefore, this study was carried out to investigate the optimum soil environmental conditions of ten contents on production of high quality fruit in 'Fuji' apple. The soil and fruit characteristics were analyzed at total 60 orchards in major apple producing areas such as Chungju, Moonkyeung, yeongju, andong, yeosan and yeongcheon (10 orchards an area). The soil environmental factors affected fruit weight was highest relative contribution in saturated hydraulic conductivity of 36.5%. The bulk density and soil pH were low as relative contribution. The fruit weight was influenced by soil physical properties more than soil chemical properties. The soil environmental factors affected sugar content were hydraulic conductivity of 28.3% and organic matter content of 18.2%. The cultivation layer depth and soil pH were low as relative contribution. The fruit coloring was highest relative contribution in saturated hydraulic conductivity 55.9%. while soil pH, cation and soil texture were low. Fruit coloring was high influenced over 70% by soil physical properties. Finally, relative contribution on fruit quality related with sugar content, fruit weight, and coloring were high influenced by saturated hydraulic conductivity of 21.% and organic matter content of 18.7% but bulk density and cultivation layer depth were low relative contribution. The fruit growth and saturated hydraulic conductivity in 'Fuji' apple were very closely related. Therefore, orchard soil management to produce high quality fruit was very importance drainage management and organic matter application. We concluded that scientific soil management is possible by qualifiable of soil management factors.

• 한국작물학회지
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• 제13권
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• pp.77-81
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• 1973

대두의 근계에 관한 연구의 제1보로 3개품종을 상토와 모래의 2개토양에서 각시기별로 재료를 채취하여 몇 개형질에 대한 조사측정을 하고 통계처리를 한 바 그 결과를 요약하면 다음과 같다. 1. 경직경의 비대는 발육초기 1개월까지는 완만하며 8월하순이후부터 급격하여지고 모래보다 상토에서 그 비대정도가 높았다. 2. Top의 길이의 신장도 발육 1개월이후부터 급격하여지고 모래보다 상토에서 더욱 신장이 잘된다. 3. Top길이보다 Root길이가 발육초기 1개월까지는 길고 Root의 길이는 반대로 상토보다 모래에서 신장이 잘된다. 4. Top무게도 발육초기 1개월까지는 완만히 증가하고 모래보다 상토에서 무겁게 나타나나 Top길이보다 Top무게의 경우에 그 증가의 정도가 완만하다. 5. Top무게보다 Root무게는 발육초기 1개월까지는 무거우며 상토에서 모래보다 무겁게 나타난다. 6. 5개형질 상호간에는 모래, 상토, 전체에 있어서 어느것이나 높은 상관관계를 보이고 Root길이와의 관계를 보면 Top무게, Top길이, Root무게, 경직경의 순서로 높은 상관계수를 나타내었다. 7. Root무게와의 관계를 보면 경직경, Top무게, Top길이, Root길이의 순서로 상관계수가 높았다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.367-367
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• 2017

Crimson clover, a legume crop, is a landscape crop and green manure crop that can be sowing in spring and autumn. Its red flower blooms in May, and serves various roles such as landscape composition, weeds suppressing, prevention of soil loss and nutrient on sloping land and supplying nitrogen and organic matter in soil. Thus, in order to utilize this crop in agriculture land, we evaluated the growth characteristics of crimson clover cultivated in four different soil textures, sand, sandy loam, loam, and clay loam. The nitrogen content of crimson clover was 15.8 g kg-1 and C/N rate was 20.3. Its growth was good in sandy loam and loam. Its plant height was 42.5 cm in sandy loam and 49.5 cm in loamy, respectively, which are approximately 20 cm longer than the sand and clay loam. The crimson clover in sandy loam and loam bloomed about seven days earlier than those in sand and clay loam. Regarding number of flower per hill and flower length, there were no difference between soil textures. Dry weight of crimson clover was 2.5 Mg ha-1, 2.3 Mg ha-1 each in sandy loam and loam. Therefore, it was approximately 0.8 ~ 1.1 Mg ha-1 higher than dry weight of sand and sandy loam. Plant height and dry weight of crimson clover was increased late harvest time. Nitrogen contribution were higher in loam and clay loam, when it was respectively 51.3 kg ha-1, 53.5 kg ha-1. Therefore, according to flowering properties and dry weight, the growth and development of crimson clover was finest in sandy loam and loam.

• 한국지반환경공학회 논문집
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• 제10권6호
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• pp.19-25
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• 2009

본 연구에서는 산업부산물인 인산석고와 EPS 조각을 기존의 성토용 토사에 혼합하여 지반응력을 감소시킴으로써 고함수비로 준설매립된 공유수면 내 초연약지반의 침하, 활동파괴, 측방유동 등의 문제를 해결할 수 있는 경량혼합토를 개발하였다. 개발된 경량혼합토는 공유수면 매립지역에서 대량이용이 가능한 도로 및 교대의 성토재료, 각종 뒤채움재로의 사용에 대한 적용성을 평가하기 위하여 기본물성시험, 다짐시험, CBR시험, 전단강도시험 등 일련의 실내시험을 수행하였고 지반공학적 특성을 검토하였다. 시험결과, 경량혼합토의 최대건조단위중량은 $14.32{\sim}15.79kN/m^3$, 최적함수비는 21.91~24.23%로 일반 화강풍화토와 비교할 때 9.4~19.3%의 하중감소 효과가 있으며, 수정 CBR값은 10.4~18.4%로 국내 도로노상 및 뒤채움재에 대한 규정을 만족하는 것으로 나타났다. 또한 전단강도정수는 점착력 10.79~18.64kPa, 내부마찰각 $35.4{\sim}37.2^{\circ}$로 각각 나타나 국내에서 일반적으로 사용되는 성토재료 및 뒤채움재 범위를 충족시키는 것으로 평가되어 실제 성토재료 및 뒤채움재로 연약지반에서 효과적으로 활용이 가능할 것으로 판단되었다. 본 연구를 통하여 개발된 인산석고 경량혼합토는 하중감소 효과가 있으면서도 전단강도와 지지력면에서 큰 문제가 없어서 연약한 임해매립지반의 도로 노상토 및 뒤채움재로 사용될 수 있어 인산석고의 대량 재활용방안이 될 것으로 판단된다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.355-360
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• 2005

The properties of contaminants, contaminated soil, and the elapsed time are important factors to in-situ soil remediation. Gabr et. al. (1996) derived the solution equation of contaminant concentration ratio as initial one $(C/C_0)$ with time and spatial changes in contaminated area with vertical drains. The contaminant concentration ratio $(C/C_0)$ is analyzed with time and spatial changes as varying the effective diameter, porosity, shape factor, density of contaminated soil and temperature in ground and unit weight, viscosity of contaminants by using FLUSH1 model. Results from numerical analysis indicate that the most important factor to the in-situ soil remediation using vertical drains is the effective diameter of contaminated soil. It also shows that the viscosity of contaminants, porosity of soil, shape of soil, temperature in ground, unit weight of contaminants are, in order, affected to the soil remediation but density of soil is insignificant to the soil remediation.

• Spatial Information Research
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• 제10권4호
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• pp.533-550
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• 2002

Soil organic matter (SOM) content and other physical soil properties were extracted from a digital soil database, the Soil Survey Geographic (SSURGO) database, to map the amount of SOM and determine its relationship with topographic positions in floodplain areas along a river basin in Douglas County, Kansas. In the floodplains, results showed that slope and SOM content had a significant negative relationship. Soils near river channels were deep and nearly level, and they had the greatest SOM content in the floodplain areas. For the whole county, SOM content was influenced primarily by soil depth and percent SOM by weight. Among different slope areas, soils on mid-range slopes (10-15%) and ridgetops had the highest SOM content because they had relatively high percent SOM content by weight and very deep soils, respectively. SOM content was also significantly variable among different land cover types. Forest/woodland had significantly higher SOM content than others, followed by cropland, grassland, and urban areas.

• 한국연초학회지
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• 제9권2호
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• pp.3-9
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• 1987

This study was been conducted to determine chemical characteristics of soils in the major districts cultivating flue-cured tobacco plant. Also native soil productivities were measured by means of bioassay planting tobacco plant without fertilizer at 87 selected lolls through pot and field experiments. Inorganic nutrient in soils affecting the dry weight of tobacco leaves cultivated in the field were investigated. The results obtained are summarized as follows; 1. Among soil chemical characteristics, pH, $NO_3$-N, $NH_4$-N , $P_2O_5$, and Mg Influenced significantly the dry weight of tobacco loaves In pot experiment, whole In the field experiments, pH, $NO_3$-N, $NO_3$-N+$NH_4$-N, and Ca had influence. 2. Correlation coefficients between soil chemical characteristics and dry weight of tobacco leaves were higher in pot experiment than field. The results revealed that soil morphological characteristics might more close influence on dry weight of tobacco leaves than chemical characteristics. 3. For prediction of dry weight (Productivity) of tobacco leaves without fertilizer multiple regression analysis were introduced using troll chemical characteristics. A combination of pH, $NO_3$-N, and Ca was very reliable for prediction of productivity as equation. y=5.02+18.07$x_1$ +2.61$x_2$ +5.36$x_3$ R=0.444** Where $x_1$ : pH, $x_2$ : $NO_3$-N, $x_3$:Ca

• 한국토양비료학회지
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• 제44권4호
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• pp.662-666
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• 2011

In this study, distribution characteristics of dioxins in soils in Busan, Korea were investigated regarding different land use types. Soil sampling sites that distributed through the Busan city showed dioxin concentration ranging from 0.489 to $322.736pg-TEQ\;g^{-1}$ dry weight with a mean value of $26.257pg-TEQ\;g^{-1}$ dry weight. The mean dioxin concentrations of investigated soils ranged from 1.554 to $50.357pg-TEQ\;g^{-1}$ dry weight in consideration of each land use type. That in metal refinery sites with $50.357pg-TEQ\;g^{-1}$ dry weight was higher than any other sites, followed by waste incinerator sites with $44.285pg-TEQ\;g^{-1}$ dry weight. The majority of soil samples had the same dioxin congener profiling despite the different range of dioxin concentration. Octa-CDD was the major contributor among seventeen dioxin congeners with the range from 29.5 to 70.1% in real values. In contrast to real values, dioxin congener profiles in TEQ values were dominated by 2,3,4,7,8-PeCDF which contributed about 35.3~43.8% to the total dioxin concentrations. It was judged by these results that penta-CDF was the major contributor of soil samples in Busan city. The mean ratio of PCDFs/PCDDs in real values was about 0.71, but that in TEQ values was, in contrast to it, approximately 3.03.

• 한국토양비료학회지
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• 제42권3호
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• pp.187-191
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• 2009

'Campbell Early', a major grape cultivar, occupies more than 70% of cultivated vineyard areas, however, recommendable standard management system of soil environmental conditions has not been developed yet in Korea. The consideration for the correlation between fruit quality and soil condition in the vineyard is required in the efficient management system of soil. This study was carried out to investigate the optimum soil environmental conditions for 'Campbell Early' grape production with high quality. The results from analyses of correlation between them were used to develop soil management guideline for promoting efficiency in grape production. Soil properties were analyzed from 120 vineyards in Hawsung, Sangju, Yeongdong, Gimcheon, Yeongju, and Yeongwol, major grape production regions. Because there is neither coloring disorder nor delayed coloration in grape production of 'Campbell Early', relative contribution of soil hardness and solid phase to fruit quality and fruit weight was analyzed. Among the soil properties, while cation and soil hardness affected sugar content at the level of 39.3% and 36.8%, respectively, saturated hydraulic conductivity, solid phase, and cation exchange capacity (CEC) showed relatively low contribution to sugar content in the vineyard. The sugar content in grapes was influenced more critically by the chemical properties than the physical ones in the soil of vineyards. While soil hardness and solid phase affected grape weight at the level of 27.8% and 26.0%, respectively, phosphate content, organic matter content, and cation showed low contribution to grape weight. Grape guality such as sugar content and grape weight was affected highly by cation and organic matters. Therefore, cation and organic matter content of soil contributed to fruit quality at the level of 33.8% and 15.5%, respectively, in the vineyard.