• 아시안잔디학회지
• /
• 제5권2호
• /
• pp.59-68
• /
• 1991

This experiment was carried out to investigate the mixing ratio of soil amending materials such as peat perlite, active carbon and zeolite for improvements of physiochemical properties of topsoil, of creeping bentgrass (Agrostis palustris var. Penncross). The results were as followed :1.Appropriate addition of soil improvement material was increased the soil porosity due to the decrease of bulk density. Over supplement of soil improvement material induced the decrease of infiltration of water into soil.2Content of organic matter was increased in treatment of peat and active carbon . Soil reaction was decreased in peat treatment, but increased in perlite, zeolite and active carbon. Exchangeable cation capacity was increased by the addition of all kinds of soil improvement materials used in this experiment.

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

• 한국농공학회지
• /
• 제40권4호
• /
• pp.85-93
• /
• 1998

In the 2nd year study of a 5 year project to evaluate the soil quality and develop the best management practices for mountaineous soils, 11 runoff plots were treated and monitored with respect to physical property of the soil, runoff and sediment discharge, and the following results were obtained. 1. Bulk density and porosity did not show any siginificant difference between experimental treatments. 2. Runoff was basically dependent on the soil's physical property and tillage. Up-and-down plots showed the highest runoff while contour plots the lowest runoff. 3. Sediment yield in the mountaineous soils was directly related to tillage and residue cover. Residue covered plots showed the lowest sediment yield and up-and-down plots the highest sediment yield. And it is recommended that the best management practices using till_age and residue cover for the mountaineous soils must be developed to protect soil quality and maintain agricultural productivity.

• 한국산림과학회지
• /
• 제111권2호
• /
• pp.263-275
• /
• 2022

본 연구는 경기도 양평군에서 발생한 땅밀림 재발생지의 지질, 지형, 토양의 물리적 특성을 분석하여 땅밀림 복구대책 수립을 위한 기초자료를 제공하기 위하여 실시하였다. 조사대상지역은 표토층, 풍화토, 풍화암 및 연암층으로, 기반암으로 셰일이 분포하고, 사암이 협재하는 철(凸)상 대지상지형으로 붕적토땅밀림지역이었다. 조사대상지역에서 신축계 및 변위측정기는 땅밀림이 재발생한 시기인 2020년 7월 1일부터 8월 27일까지 1.1~6.5 mm 변화하여 땅밀림의 영향이 나타났다. 땅밀림은 S65° W, E45° S, E70° S 두 방향으로 진행되었으며, 지하수의 유향분석 결과인 주 흐름방향 E82.5° S, S16.8° W와 유사하여 지하수의 유출방향으로 땅밀림이 발생하는 것으로 분석되었다. 땅밀림지의 평균산지경사는 19.3°로 우리나라의 평균산지경사(25°)보다 낮은 완경사지에서 발생하였으며, 지하수가 유출되는 지역에서는 토양의 용적밀도가 낮게 나타났다.

• 한국환경과학회지
• /
• 제31권7호
• /
• pp.665-675
• /
• 2022

The purpose of this study was to provide basic information for judging cultivation suitability by analyzing the growing environment of Zanthoxylum schinifolium habitats in Gyeongnam-do. The site environment, soil environment and community structure were analyzed in habitats of 7 cities and counties. The habitats were distributed in slopes at 87~764 m above sea level. It was found habitats was distributed in the well-drained soil with high content of sand and soil texture of habitats was mainly loamy sand and sandy loam. Bulk density and particle density were 0.89 g/cm³ and 2.65 g/cm³ on average, respectively. The soil had 5.10 of pH, 6.41% of OM content, 0.29% of TN content, 3.84 ppm of available P content, and CEC of 12.3 cmol⁺/kg on average. The habitats were classified into four communities (Z. schinifolium-Lindera erythrocarpa, Castanea crenata-L. erythrocarpa, Pinus densiflora-Z. schinifolium, P. thunbergii-Z. schinifolium by clustering analysis. Ecological niche breadth was highest of 0.885 in site (T VI ongyeong) and lowest of 0.608 in site (Goseong).

• 한국토양환경학회지
• /
• 제4권1호
• /
• pp.119-126
• /
• 1999

This study was carried out to estimate the effect of forest fire on physical and chemical properties of soil The forest fire was in April 1995 at Kongju of Chungnam. Soil samples were collected at 0~5cm, 5~10cm, and 10~20cm soil depths in September 1998 from the burned and unburned sites. Soil organic matter concentrations at 0~5cm and 5~10cm soil depths were significantly greater in unburned site than in burned site. Soil concentrations were greater in unburned site than in burned site at all soil depths. Cation exchange capacity was significantly higher in unburned site than in burned site at 0~5cm soil depth. There were no differences in available soil P, exchangeable soil K, Ca, and Mg, and pH of soil between burned and unburned sites. Soil water content at 0~5cm soil depth was significantly greater in unburned site than in burned site. Bulk density at 0~5cm soil depth was significantly higher in burned site than in unburned site. Forest fire had an adverse effect on physical and chemical properties of soil in this study, Burning of vegetation and forest 리oor organic matter in burned site may reduce organic matter supply to soil and increase soil erosion. Consequently, forest fire may have adverse influence on long-term site productivity.

• 한국토양비료학회지
• /
• 제39권6호
• /
• pp.366-371
• /
• 2006

본 연구는 쌀겨와 밀기울의 토양 혐기발효가 시설 연작지 토양의 물리 화학성에 미치는 영향을 구명하기 위하여 수행하였다. 처리 150일후 토양 물리성을 조사한 결과 무 처리구의 물리성은 용적밀도 $1.46Mg\;m^{-3}$, 경도 $2.30Kg\;cm^{-3}$, 수리전도도 $4.8cm\;hr^{-1}$ 그리고 입단안정성(0.5 mm<)은 6.70% 이었다. 쌀겨와 밀기울을 처리한 토양은 용적밀도가 각각 12%와 14% 감소되었으며, 경도는 58%와 67%가 낮아졌다. 또한 수리 전도도는 4.5배와 6.3배가 증가하였으며, 0.5 mm 이상의 입단율은 5.2배와 6.5배가 증가하여 물리성이 크게 개선된 것을 확인하였다. 한편 토양 화학성 중 질산태질소 함량은 무 처리구와 비교하여 98%가 감소한 각각 4.59와 $5.42mg\;kg^{-1}$로 크게 감소하였다. 이와같은 질산태 질소의 감소는 토양 미생물체 량의 증가로 인한 것으로 조사되었다. EC는 쌀겨처리구가 $1.48dS\;m^{-1}$로 무처리구와 비교하여 약 58%가 감소하였으나 밀기울 처리구는 처리중 생산된 초산과 낙산으로 인하여 $3.65dS\;m^{-1}$로 증가하다 처리 30일 후 $2.0dS\;m^{-1}$ 이하로 감소하였다. 결론적으로 쌀겨와 밀기울의 토양 혐기발효 처리는 시설 하우스 토양의 EC농도와 질산태 질소의 농도를 낮추고 토양 물리성을 개선하는데 효과적이었다.

• 한국토양비료학회지
• /
• 제27권2호
• /
• pp.105-110
• /
• 1994

신개간지(新開墾地)에서 몇가지 물리화학적인 개량방법(改良方法)을 병행(竝行)하여 실시하여 년차간에 토양특성 변화와 율무의 수량을 조사하여 토양개량과 율무재배에 대한 기초자료를 얻고자 신개간지에서 율무를 1955년부터 4년간(年間) 재배하면서 율무수량과 토양(土壤)의 변화량과 변화율(變化率)을 조사, 분석한 결과는 다음과 같다. 1. 토양의 용적밀도(容積密度)나 경도(硬度)는 표토(表土)에서 3년차까지 계속 낮아지다가 개량제 시용이 없었던 4년차에는 높아졌다. 토양산도는 토심이나 년차간에 큰 차이가 없었다. 2. 율무수량(收量)은 종합개량처리(綜合改良處理)가 평균(平均) 2.16ton/ha로 가장 많고 대조구(對照區)에 비하여 49% 증수(增收)되었으며 다른 처리구의 수량은 심경구(深耕區)>인산구>석회구>퇴비구>대조구(對照區) 순(順)으로 많았다. 3. 연차간(年次間) 율무수량과 토양의 물리화학성과의 상관계수(相關係數)는 토양산도와 유기물 함량이 가장 높았고 표토(表土)보다는 심토(心土)에서 유의성이 높았다. 4. 토양의 물리화학성 변화율(變化率)과 율무수량(收量)과의 상관관계는 토양의 용적밀도와 경도가 가장 높았고 토양 화학성중에서는 표토(表土)에서 토양산도(土壤酸度)만이 유의성이 있었다.

• Journal of Biosystems Engineering
• /
• 제18권3호
• /
• pp.209-219
• /
• 1993

A series of soil bin experiment was carried out on sand to investigate if true model theory is applicable to blade-soil system and finally to find mathematical relationship between the dimensionless terms which contain the blade-soil parameters. The following conclusions were derived from the study. 1. It was proved that the draft of the prototype blade can be predicted without distortion by those of model blades with the length scale of 1.2, 2 and 2.4. 2. For the sand, bulk density was found to be a good measure of soil physical properties which are pertinent to predict the draft of the blade-soil system. 3. The mathematical relationship between $D/{\gamma}W$ and d/W, ${\beta}$, and $V^2/Wg$ are as follows ; $$\frac{D}{{\gamma}W^3}=124.98[\frac{d}{W}]^2+7.16[\frac{d}{W}]+0.43 \\ \frac{D}{{\gamma}W^3}=-0.00099{\beta}^2+0.13{\beta}-2.01 \\ \frac{D}{{\gamma}W^3}=0.041[\frac{V^2}{Wg}]^2+0.08[\frac{V^2}{Wg}]+1.3$$

• 한국토양비료학회지
• /
• 제34권5호
• /
• pp.365-372
• /
• 2001

본 연구는 밭 토양에서 종류가 상이한 퇴비 연용이 토양 중 물리적 특성과 토양 미생물상 변동에 미치는 영향을 구명하기 위하여 수행하였다. 밭 토양 토성은 양토와 사양토를 공시하여 계분퇴비, 우분퇴비, 분뇨잔사 및 식품오니퇴비등 4종을 사용하였다. 퇴비 시용량은 0, 40, $80Mg\;ha^{-1}$ 수준으로 처리하여 1994년 1997년도까지 4년간 시험한 주요연구결과를 요약하면 다음과 같다. 양토의 용적밀도는 퇴비 무시용구가 $1.49Mg\;m^{-3}$인 반면에 퇴비시용구는 $1.07{\sim}1.32Mg\;m^{-3}$, 사양토는 무시용구 $1.25Mg\;m^{-3}$에서 시용구는 $1.00{\sim}1.20Mg\;m^{-3}$ 수준으로 감소하였다. 재배작물별 용적밀도변화는 옥수수재배는 나지와 비슷하였다. 퇴비시용시 유기물 분해미생물은 $5^{\circ}C$보다 $25^{\circ}C$ 조건에서 배양초기에 균수가 급속히 증가되었고, 토성별로는 양토에서 사양토보다 민감하게 증가되었다. 질소순환에 관련된 미생물의 변화는 암모니아 산화균은 배양초기에 많았고, 탈질균은 1~4주까지 증가되다가 다시 감소되었다. 토성별로는 암모니아 산화균은 양토에서, 탈질균은 사양토에서 $25^{\circ}C$ 조건에서 균수가 증가되었다.