• 생명과학회지
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• 제9권4호
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• pp.368-374
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• 1999

Three soybean cultivars, Hwangkeum, Tanyeob and Enrei were planted in the same pot under glasshouse conditions to investigate the influence of the different soil water content such as pF 1.4(wet), 2.1(control) and 3.6(dry) on the transpiration rate, dry matter production and water requirement. The transpiration rate remained the high constant rates under the wet soil condition and the control than the dry condition, and showed a linear correlation between transpiration rate and solar radiation under the all condition of soil water. The transpiration rate highly increased in the morning, but dramatically decreased in the other time in a day. The dry matter production was higher under the conditions of wet soil and the control than that under the dry condition. Also, the dry matter production Tanyeob was higher than other cultivars under all soil water content. The water requirement was higher for Enrei and lower Tanyeob than the control.

• 한국의상디자인학회지
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• 제21권4호
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• pp.213-220
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• 2019

The dry cleaning effect related to the type of soil and fiber was analyzed using silicone and alcohol-based solvents(ethyl alcohol, isopropyl alcohol, acetone) that are relatively safe for the human body and environment to improve the detergency of hydrophilic soils in dry cleaning system. Based on this analysis, an effective dry cleaning method to be carried out for improving the detergency according to the type of hydrophilic soils. After dry cleaning was performed using 20 types of artificial soiled fabrics consisting of 7 types of fibers and 4 types of hydrophilic soils, the detergency was measured and the results were compared and analyzed by solvents and fiber types. The results are presented as follows; first, the detergency of hydrophilic soils using silicone solvents showed a low rate of detergency. In particular, the tannin soil showed a lower level of detergency compared to the protein soil. Second, the detergency of hydrophilic soils using silicon solvents with dry soap differed in some detergency according to the soil and fiber types. Especially, the detergency of curry soil on cotton fabric showed significant improvement. Third, the protein soil was not removed from dry cleaning using alcohol-based solvents, but the effect of dry cleaning of curry soil on both cotton and polyester fabric was substantially improved. As a result, the elimination of blood soil is more effective in silicon solvents than in alcohol-based solvents. The removal of tannin soils may improve detergency by adding dry soap to silicon solvents or by using alcohol-based solvents as alternative solvents. The use of alternative solvents such as silicon and alcohol solvents can contribute to the environmental improvement of the dry cleaning industry, which uses petroleum-based solvents. It is also expected to provide consumers with the opportunity to choose eco-friendly and efficient dry cleaning methods.

• 한국유기농업학회지
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• 제5권2호
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• pp.93-104
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• 1997

In order to investigate the growth response of grasses to chitosan solution amended soil were studied from the standpoint of estimating the growth stimulating adequate concentrations of chitosan solution amended soil in each grass. Three species in this experiment used were orchardgrass, tall fescue and reed canarygrass. Six different concentrations of chitosan solution amended soil were 0%(control), 0.01%, 0.05%, 0.1%, 0.5% and 1.0%, respectively. The resulte obtained were as follows ; 1. Leaf area(LA), dry weight of leaf(LW), dry weight of shoot(SHW), biological yield(BY), C/f ratio and T/R ratio were significantly different between species. 2. Growth stimulating effect by chitosan solution amended soil were found in plant length(PL) and T/R ratios of grasses. 3. Adequate concentrations of chitosan solution amended soil were different between species. The highest values of yield components and dry weight of plant parts were obtained at 0.01% in orchardgrass, 0,05% in reed canarygrass and 1.0% in tall fescue, respectively. 4. The growth response of grasses to chitosan solution amended soil were different between species. Thus, an increase in leaf area(LA) and dry weight of leaf(LW) by chitosan solution amended soil was mainly contributed to increase in dry weight of shoot(SHW) and biological yield(BY) in orchardgrass. Chitosan solution amended soil also stimulated growth of shoot and increased in biological yield(BY) in tall fescue. In reed canarygrass contributed to increase in C/F ratios. 5. Adequate concentrations of chitosan solution amended soil for an economical benefit of cultivation and dry matter production of grasses were ranged from 0.01% to 0.05% levels.

• 한국농공학회지
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• 제12권1호
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• pp.1883-1886
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• 1970

This study was made to obtain the optium compaction of quicklime mixed with soil and to find out the relation of the quicklime mix ratio, dry density and strength by changing the compaction rounds. The obtained results are as follows. 1. The maximun dry density of unmixed soil in not distinguishable, while that of mixed soil is distinguishable. 2. What the increase of quicklime mix ratio, the dry density and strength increase and the optimum quicklime mix ratio could be obtained. 3. With the increase of compaction rounds, the dry density and strength increase, while they decrease in a certain limit and maximum dry density and strength could be obtained.

• 한국미생물·생명공학회지
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• 제42권1호
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• pp.32-40
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• 2014

본 연구에서는 도심 학교 운동장(soil A)과 화단(soil B, C, & D)에서 채취한 토양의 잠재적인 메탄 산화 및 생성능을 평가하였다. 토양 원시료 중 메탄 산화균 수를 정량 분석한 결과, 운동장 토양(soil A)는 $6.1{\times}10^3$ gene copy number/g dry weight soil이었으나, 화단 토양(soil B~D)는 $1.6-1.9{\times}10^5$ gene copy number/g dry weight soil이었다. 토양을 넣은 혈청병에 메탄 가스를 주입하여 잠재 메탄 산화능을 평가한 결과, 운동장 토양은 다른 토양보다 메탄을 산화하기까지 긴 유도기를 보였으나, 유도기 이후에는 화단 토양과 거의 유사한 메탄 산화능을 나타냈다. 또한 운동장 토양의 메탄 산화균 수는 $2.3{\times}10^7$ gene copy number/g dry weight soil까지 증가하여 화단 토양의 메탄 산화균 수($1.2-2.8{\times}10^8$ gene copy number/g dry weight soil)과 유의적 차이를 보이지 않았다. 교정에서 채취한 토양의 메탄 생성 거동도 메탄 산화와 유사한 패턴을 보였다. 토양 원시료의 메탄 생성균 수는 화단 토양($1.3-3.4{\times}10^7$ gene copy number/g dry weight soil)에 비해 운동장 토양($1.7{\times}10^5$ gene copy number/g dry weight soil)이 훨씬 적었다. 그러나 토양에 유기물을 첨가한 후 메탄 생성 현상이 발휘된 후에는 메탄 생성 균수는 운동장 토양과 화단토양 모두 $10^7$ gene copy number/g dry weight soil 수준이었다. 본 연구를 통해 도심 교정에서 채취한 네 종류의 토양은 모두 메탄 산화균 및 생성균을 가지고 있으며, 메탄 산화와 생성에 적합한 조건이 되면, 메탄 산화균 및 생성균의 개체군이 증가하여 메탄을 산화하거나 생성할 수 있는 잠재력을 지니고 있음을 알 수 있었다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.357-364
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• 1999

The purpose of this study is to analysis the grain distribution and compaction characteristics of structural backfill with reclaimed soil. Five(5) reclaimed soil samples which passed #200 sieve have been used in the test. The study showed that the maximum dry density and the bearing value rate turned out to be becoming smaller when the more the quantity passed #200 sieve, the smaller the soil grain. The maximum dry density value calculated from the compaction md relative density test showed wet method > compaction method > dry method. The correlation coefficient between Rc and Dr based on the grain distribution and the compaction characteristics showed that the maximum dry density value by the wet method is little higher than the compaction method and dry method.

• 한국토양비료학회지
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• 제23권1호
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• pp.60-66
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• 1990

영남지역(嶺南地域)의 수종(數種) 토양통(土壤統)에서 경작여부(耕作與否)에 따른 토착(土着) 대두근류균(大豆根瘤菌)의 분포특성(分布特性)을 구명(究明)하였다. 이를 위하여, 토양통(土壤統)이 서로 다른 5개(個) 지점(地點)의 경작지(耕作地)와 미경작지(未耕作地) 토양(土壤)의 대두(大豆) 접종효과(接種效果)(Soil inoculum potential)와 토착근류균(土着根瘤菌)의 취락형태적(聚落形態的) 분포특성(分布特性)을 조사(調査)하였는데 그 결과(結果)는 다음과 같았다. 1. 영남지역(嶺南地域)에 분포(分布)한 토착(土着) 대두근류균(大豆根瘤菌)의 밀도(密度)는 경작지(耕作地)의 경우 $10^4Cells/g$. soil 이상(以上)이었으나 미경작지(未耕作地)에서는 경미(輕微)하였다. 2. 경작지(耕作地) 토양(土壤)의 대두(大豆) 접종효과(接種效果)(Soil inoculum potential)는 NifTAL의 우수근류근(優秀根瘤菌) 접종제(接種劑) TAL 보다 좋았고, 대두근류균(大豆根瘤菌)의 질소고정(窒素固定) 특성면(特性面)에서 근류(根瘤) 무게가 근류수(根瘤數)를 보상(報償)하였다. 3. 토착(土着) 대두근류균(大豆根瘤菌)의 취락형태별(聚落形態別) 분포(分布)는 경작여부(耕作與否)에 따라 상이(相異)하였는데, "Dry"형(形) 기경지(旣耕地)에서, "Wet"형(形)은 미경작지(未耕作地)에서 각각(各各) 우점경향(優占傾向)을 보였다. 4. 토착(土着) 대두근류균(大豆根瘤菌)의 취락형태별(聚落形態別) 공생효과(共生效果)는 "Dry"형(形)이 "Wet"형(形)보다 좋았다. 따라서 숙전(熟田)에서의 대두생육(大豆生育)은 "Dry"형(形) 토착(土着) 대두근류균(大豆根瘤菌)의 밀도(密度)에 크게 영향(影響)을 받을 것으로 판단(判斷)되었다.

• 한국농공학회지
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• 제12권1호
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• pp.1854-1860
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• 1970

Results of this study on the influence of percent passing of No. 200 sieve on soil compaction are as follows; 1. The higher maximum dry density of soil is, the lower optimum moisture content is. Maximum dry density is highest value and optimum moisture content is the lowest value in twocases that percents of No. 200 sieve are 30% in soils of which percents retained on No. 10 sieve are 5% and 10% respectively. 2. Maximum dry density increases according as uniformity coefficient increase. Maximum dry density is the highest when uniformity coefficient is approximately 300 in soil of which maximum diameter is 4.76mm. 3. Maximum dry density has a tendency to become large according as value of Cu Caincrease. Correlation between maximum dry density and $Log_{10}$(CuCa) shows straight line. 4. Maximum dry density increases according as n increase and reaches the peak when n equal 0.35 in condition that the index of talbot formula n is less than 0.35 in soil of which maximum diameter is 4.76mm. 5. Maximum dry density has a tendency to increase according as value of Cg $(Cg=\frac{P_{50}^2}{P_{10}{\times}{P_{200}}$) decrease.

• 한국토양비료학회지
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• 제49권6호
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• pp.662-668
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• 2016

No-tillage dry-seeding of rice can offer potential benefits by reducing time and labor cost compared with conventional tillage practices. This study was conducted to investigate the effects of no-tillage dry-seeding on rice growth and soil hardness in comparison with other rice cultivation methods, machine transplanting and wet-hill-seeding on puddled paddy. The seedling stand fell within optimum range for both no-till dry-seeding and wet-hill-seeding on puddled paddy. Plant height, number of tillers and SPAD values in no-tillage dry-seeding cultivation were higher than those observed in other methods. There were no significant differences in grain yield of rice among three cultivation methods. The quality characteristics of milled rice grown in no-tillage dry-seeding were similar to those grown in other cultivation methods. Soil hardness in top 10 cm depth was significantly higher in no-tillage dry-seeding than other cultivation methods, while soil hardness below 10 cm depth was highest in machine transplanting cultivation. Results indicate that no-tillage dry-seeding practice is comparable to conventional tillage system in terms of seedling establishment, growth, yield and grain quality.

• 한국농공학회지
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• 제18권3호
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• pp.4163-4170
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• 1976

This study was conducted to investigate the effect of starch as a retarder on the maximum dry density and the unconfined compressive strength of soil cement mixtures for varied starch contents (0-3%), cement contents (3-12%), and delay times (0-6hrs) in four soils. The experimental results obtained from maximum dry density and unconfined compressive strength tests are as follows: 1. Maximum dry density and unconfined compressive strength were increased greatly in soil cement mixtues rwhen starch was added as retarder but their value schanged according to soil varieties. 2. Maximum dry density showed at about 0.5 percent to 1.0 percent of starch in KY soil and about 2.0 percent to 2.5 percent in SS soil when delay time was changed in 2.4, and 6 hours in compaction test. 3. The larger content of cement was, the bigger effects of maximum dry density and compressive strength were in soil cement. mixtures. 4. As delay time changed 2.4, and 6 hours in compaction test, 7-day unconfined compressive strength showed the biggest value at about 0.5 percent of starch in KY soil and 2.0 percent in SS soil, and the maximum value of 28-day unconfined compressive strength showed at about 0.5 percent in KY soil and 1.5 percent in SS soil.