農學의 變化趨勢와 이에 對應한 農科大學의 發展方案

蔡濟天 단국대학교 1994 論文集 Vol.28 No.-

The future agriculture is expected to emphasize the importance of high quality and high-technology, safety of agricultural products than yield quantity and land culture technology. And also the role of agriculture is expected to emphasize the importance of conservation function of environments including air, water and soils. The severe competition between food-producing areas is expected to occur, so the characterization of agriculture is important to secure international and inter-regional competition ability. Therefore, our agricultural college have to implicates these current of the times of agricultural sciences. It is necessary to renew the aim of agricultural education, improve the curriculum including introduction of applied bio-production concept, develope the bio- and natural-resources, introduce the low input sustainable agriculture and preservation of environments. It is desirable to introduce unified lecture, interdisciplinary research contribution to regional society. It is desirable too to change the name of agricultural college and departments for promotion of future development.

忠淸南道地方의 栽培作物 變遷에 關한 硏究

李正行,蔡濟天,具千書 단국대학교 1984 論文集 Vol.18 No.-

This work was conducted to investigate the changes in cultivated crops during past 20years in central region of Korea. The results were summarized as follows; In 1960's, 91∼92% of arable land was planted for cereal food crops, 4.5∼5.5% for vegetables and 2.4∼4.3% for potatoes, respectively. In 1980's, however, the acreage of cereal food crops was decreased dramatically, on the contrally, the acreage of vegetables and industrial crops were increased considerably. The acreage of barley, wheat, millet, soybean, azuki bean and sweet potato were reduced greatly, whereas rice was increased everywhere, and such cash crops as white potato, sesame, tobacco, vegetables and fruit trees were increased at most of the area during past 20years.

忠淸南道地方의 作付體系 變遷에 關한 硏究

李正行,具千書,蔡濟天 단국대학교 1984 論文集 Vol.18 No.-

This work was carried out to investigate the changes in cropping systems and the factors influencing it during past 20 years from 1960 to 1980 at central Korea. 12 villages were selected as sample location based on the analysis of agricultural census, then the on-the-spot survey was carried out. The results were summarized as follows; 1. The barley in double paddy was planted over 50 percent of the paddy field at 1960's, on the other hand, it was decreased below 10 percent at 1980's. 2. The simple cropping system of barley-legume formed 70∼80 percent of total upland area at 1960's, but the various cropping patterns including such cash crops as vegetables and industrial crops were developed at 1980's. 3. The major factors influencing the change of cropping system were earnings, natural conditions of location and rural extension, whereas, the minor factors were release of new variety, cultural technique, markets, labor power and activities of farm leaders. 4. It was considered that the cropping system was influenced greatly by the natural conditions such as climate and soil conditions in case of the same technical, economical and social circumstances.

몽골의 農業및 社會 現況과 協力展望

Je-Cheon Chae 한국국제농업개발학회 1991 韓國國際農業開發學會誌 Vol.3 No.1

Effect of Tillage and Seeding Methods on Percolation and Irrigation Requirement in Rice Paddy Condition

Chae, Je-Cheon The Korean Society of Crop Science 1998 Korean journal of crop science Vol.43 No.4

The experiment was conducted to clarify irrigation requirement and percolation rate in rice paddy. The four rice cultural system of no-tin, till, transplanting, and direct seeding condition were treated in the lysimeter filled with sandy loam soil. The amounts of irrigation and soil percolation were measured daily, and irrigation requirement was estimated. The daily percolation was 19.5 l/$\textrm{m}^2$ in no-till direct seeding on flooded paddy surface, 17.4 l/$\textrm{m}^2$ in both of till-direct seeding on flooded surface and no-till transplanting, and 15.2 l/$\textrm{m}^2$ in transplanting plot. This is equivalent to 19.5, 17.4, and 15.2 mm per day, respectively. Highest irrigation requirement was 3,770 l/$\textrm{m}^2$ in no-till direct seeding plots. Others were 3,249, 2,577, and 2,321 l/$\textrm{m}^2$ in till-direct seeding, no-till transplanting and transplanting plot, respectively. The estimated irrigation requirement of no-till transplanting, till-direct seeding and no-till direct seeding was increased by 11, 37, and 59% compared to till-transplanting plot. Percolation rate of no-till transplanting, till direct seeding and no-till direct seeding was increased by 12%, 40%, and 66%, respectively compared to the till-transplanting plot. The percolation rate in paddy soil was increased greatly after reproductive stage of rice.

Effect of Tillage and Seeding Methods on Percolation and Irrigation Requirement in Rice Paddy Condition

Je-Cheon Chae 韓國作物學會 1998 Korean journal of crop science Vol.43 No.4

The experiment was conducted to clarify irrigation requirement and percolation rate in rice paddy. The four rice cultural system of no-tin, till, transplanting, and direct seeding condition were treated in the lysimeter filled with sandy loam soil. The amounts of irrigation and soil percolation were measured daily, and irrigation requirement was estimated. The daily percolation was 19.5 l/~textrmm2 in no-till direct seeding on flooded paddy surface, 17.4 l/~textrmm2 in both of till-direct seeding on flooded surface and no-till transplanting, and 15.2 l/~textrmm2 in transplanting plot. This is equivalent to 19.5, 17.4, and 15.2 mm per day, respectively. Highest irrigation requirement was 3,770 l/~textrmm2 in no-till direct seeding plots. Others were 3,249, 2,577, and 2,321 l/~textrmm2 in till-direct seeding, no-till transplanting and transplanting plot, respectively. The estimated irrigation requirement of no-till transplanting, till-direct seeding and no-till direct seeding was increased by 11, 37, and 59% compared to till-transplanting plot. Percolation rate of no-till transplanting, till direct seeding and no-till direct seeding was increased by 12%, 40%, and 66%, respectively compared to the till-transplanting plot. The percolation rate in paddy soil was increased greatly after reproductive stage of rice.

Effect of Grain Specific Gravity on Seedling Growth and Vascular Bundle Development of Two Rice Cultivars

Chae, Je-Cheon,Lee, Dong-Jin The Korean Society of Crop Science 1996 Korean journal of crop science Vol.41 No.1

High density (HD) grains is associated with seedling vigor. Studies were conducted on the relationship of different grain densities and vascular bundle(VB) development and seedling growth. IR58 (indica type) and Unbong 7 (japonica type) were used in this experiment. HD grains had more and bigger VB in the leaf blade and sheath than poor density grain at seedling stage. IR58 had more large VB at the leaf compared with Unbong 7. Higher development of VB in seedling of HD grains can increase transport of assimilate and growth rate. Plant height, leaf number, root growth and dry weight increased with increasing grain density from poor to high. The total area of large VB in the leaf blade and sheath was highly correlated with the dry weight. Higher number and larger area of VB and dry weight can be obtained by using HD grains and these initial advantages can contribute to high yield potential. 본 실험은 비중선으로 종자밀도를 5등급으로 세분한 뒤 각 등급별 유묘의 유관속 발달 및 생육 특성에 미치는 영향을 구명하기 위하여 인디카형인 IR58과 자포니카형인 운봉7호를 공시하여 수해한 결과는 다음과 같다. 1. 종자의 밀도가 1.00이하에서 1.20이상으로 높아질수록 유묘의 엽신과 엽초에 발달된 유관속수와 크기가 증가하는 경향이었다. IR58은 운봉7호보다 유관속수와 크기가 양호하게 발달하였다. 2. 유묘의 생육특성인 초장, 엽수, 근수 및 근장은 종자의 밀도가 1.20이상까지 높아질수록 증가하였다. 3. 엽신과 엽초에 발달된 유관속수는 건물중과 고도로 유의한 정의 상관관계를 나타냈으며, 제4, 5엽신의 대유관속수는 엽신폭과 유의한 정상관을 보였다. 4. 종자의 밀도가 높아질수록 유묘의 유관속 발육을 좋게 하며 양수분의 원활한 이동으로 인하여 생육이 양호하게 건묘육성에 바람직하였다.

벼종자의 비중차이가 유묘생장 및 유관속 발달에 미치는 영향

Je Cheon Chae,Dong Jin Lee 韓國作物學會 1996 한국작물학회지 Vol.41 No.1

본 실험은 비중선으로 종자밀도를 5등급으로 세분한 뒤 각 등급별 유묘의 유관속 발달 및 생육 특성에 미치는 영향을 구명하기 위하여 인디카형인 IR58과 자포니카형인 운봉7호를 공시하여 수해한 결과는 다음과 같다. 1. 종자의 밀도가 1.00이하에서 1.20이상으로 높아질수록 유묘의 엽신과 엽초에 발달된 유관속수와 크기가 증가하는 경향이었다. IR58은 운봉7호보다 유관속수와 크기가 양호하게 발달하였다. 2. 유묘의 생육특성인 초장, 엽수, 근수 및 근장은 종자의 밀도가 1.20이상까지 높아질수록 증가하였다. 3. 엽신과 엽초에 발달된 유관속수는 건물중과 고도로 유의한 정의 상관관계를 나타냈으며, 제4, 5엽신의 대유관속수는 엽신폭과 유의한 정상관을 보였다. 4. 종자의 밀도가 높아질수록 유묘의 유관속 발육을 좋게 하며 양수분의 원활한 이동으로 인하여 생육이 양호하게 건묘육성에 바람직하였다. High density (HD) grains is associated with seedling vigor. Studies were conducted on the relationship of different grain densities and vascular bundle(VB) development and seedling growth. IR58 (indica type) and Unbong 7 (japonica type) were used in this experiment. HD grains had more and bigger VB in the leaf blade and sheath than poor density grain at seedling stage. IR58 had more large VB at the leaf compared with Unbong 7. Higher development of VB in seedling of HD grains can increase transport of assimilate and growth rate. Plant height, leaf number, root growth and dry weight increased with increasing grain density from poor to high. The total area of large VB in the leaf blade and sheath was highly correlated with the dry weight. Higher number and larger area of VB and dry weight can be obtained by using HD grains and these initial advantages can contribute to high yield potential.

식량 안정생산기술의 전망

채제천(Chae Je Cheon),강양순(Gang Yang Sun),이영호(Lee Yeong Ho),남중현(Nam Jung Hyeon) 한국작물학회 1999 한국작물학회 학술발표대회 논문집 Vol.1999 No.-

The major problems of food crop cultivation in Korea are low yield of most crops except rice. inefficient cultivation techniques for aged farmers. and low international competibility. Therefore, development of cultivation techniques of food crops should aim the yield. quality improvement, labor reduction and production cost. The primary issue for increasing the yield of soybean, barely and wheat is to reduce the yield gap between the farmer s yield and recommended ones of experiment station. More advanced cultivation techniques needs to be developed. and/or the conventional breeding methods to be reconsidered. The newly developed labor-saving mechanized technique needs to reduce labor hours , and the cost of agricultural implements and machineries. In other words the labor-saving mechanized technique should be developed based on the improvement of total farming system as well as systemic fundamental innovation of cultural methods. The efficiency of solar energy use in food production of Korea in 1997 is as low as 0.52% so there is much room to increase yield. It is recommendable that the concept of food Production should be changed to energy Producing efficiency Per unit area basis from volume and weight of food materials. Moreover, introduction of resonable cropping system is needed to increase yield of main crops, farmer s income, solar energy use efficiency, and decrease of land service expenditure. Current cropping system emphasized on economic crops. especially in vegetables , is not desirable for resonable use of arable land. stability of agricultural management and staple food crop self-sufficiency ratio. It is desirable to increase food crops . that are energy of carbohydrate and protein rich and land dependent crops. in cropping system. And the agronomist should develop the cultural methods to replace food crops for food self-sufficiency and stable farming management instead of economic crops in current cropping system. Low-input and environmentally-sound crop cultivation techniques, especially nitrogen-reducing culture technique which is directly related to food crop quality, also needs to be developed urgently. The extended cultivation of corn in upland and barely and wheat in lowland as a feed stuffs is recommended to prevent further decrease of food self-sufficiency ratio, which is mainly caused by the high reliance on imported feed grain. It is also considered that the calculation and presentation methods of standard agricultural income needs to be improved. The current calculation method uses unit land area of 10a regardless of crop kinds , characteristics of agricultural management and cultivation scale. So, it is apt to lead misunderstanding of farm income value. Therefore. it should show an income of average farmers for certain number of years. Research and developing system for food producing is not desirable because they are conducted currently individual crop and mono-culture basis. But actual agricultural income is usually earned by cropping system including upland and lowland. For example. the barley and wheat is usually cultivated in double cropping system. The cooperation among research institutes such as university agribusiness. government and farmers is indispensible. The public information and education on importance and consumption habit of food crops is necessary in Korean society to increase food self-sufficiency through nationwide cooperation.

우리나라 쌀의 품질과 기능성 실태, 연구현황 및 발전방향

채제천(Je-Cheon Chae) 한국식품과학회 2004 식품과학과 산업 Vol.37 No.2