Eiji Yamaji / Professor / Division of Environmental Studies
Department of International Studies / / Paddy Field Engineering, Rural Planning

Career Summary
1978 Bachelor of Agriculture, Agricultural engineering, Faculty of Agriculture, University of Tokyo, Japan
1980 Master of Agriculture, Agricultural engineering, Graduate School of Agricultural Sciences, University of Tokyo
1981-1989 Assistant Professor, Agricultural engineering, Faculty of Agriculture, University of Tokyo
1986 Ph.D. of Agriculture, University of Tokyo
1989-1996 Associate Professor, Agricultural engineering, Faculty of Agriculture, University of Tokyo
1996-1999 Associate Professor, Graduate School of Agricultural and Life Sciences, University of Tokyo
1999-Present Professor, Department of International Studies, Graduate School of Frontier Sciences, University of Tokyo

Educational Activities
Graduate school: Agricultural Development, Rural Planning, Field Work and Hypothesis Formation, Design Studio for Rural Area
Faculty of Agriculture: Rural Planning, Biology in Environment and Landscape (allotment), Communication Science in Organisms and Environment (allotment)
College of Arts and Science: Environmental Sciences in Food & Regional Planning
Research Activities
The research field is agro-environmental science. Therefore, studies on farmland are the basis. And environmental aspects of rural area also included in the research field.
The first research field is the farmland. Although land productivity in Japan is sufficient, labor productivity is very low. And measures for reforming have been proposed, but the condition is not so improved. Enlarging management size and cultivation field are concrete measures, and technical development of the latter was attempted. This included development of a “laser-controlled bulldozer” I proposed a rating system for the problem of land leveling precision. For this problem, I categorized rice fields and how revented the degradation and clarified it by further investigation of the large-sized paddy fields. In addition, I quantified a standard for land leveling precision according to the drainage properties. For the quantification, I developed a three-dimensional enclosure model. Furthermore, I investigated the rice fields of many countries and proposed land onsolidation method of California. I also investigated the influence of the environment on rice growing in Australia.
With regard to the influence of agricultural activities on the environment, I investigated the kinds of environmental load produced by different kinds of agricultural activities. The environmental load of raising stock and dry field farming is high, but, from the viewpoint of purifying water in the agricultural sector, I demonstrated the effects of a water purification ability in rice fields and developed a plan for reducing environmental load.
With regard to rural area, there have been analyses from the maintenance viewpoint on land consolidation of the “Jori” ancient structures. In addition, the placement of farmland and residential areas of Nepalese agricultural settlements have been investigated, as have farm road networks. The wordless image of the park has been analyzed, and an ideal park has been presented.
The above studies indicate the importance of the tool common to these studies: remote sensing. Improvement of the classification precision of remote sensing has been investigated, as has use of it to match a satellite image and the position relations with an object above the ground more precisely. Land cover classification in developing countries has also been studied.
Another tool commonly used in this field is a geographical information system. It compiles information about the existence and maintenance standards of farmland into a database. Certain conditions can be extracted from this database and there have been studies that pointed out enabled area for each condition.
1) Yamaji, Shiozawa eds.: Farmland environment and engineering, Buneido, 2008
2) Mizutani eds.: Advanced Paddy Field Engineering, Shinzansha Sci-Tech, 1999
3) The Japanese Society of Irrigation, Drainage edit.: New edition Rural Planning, 2003

Other Activities
Positions in societies
The Japanese Society of Rural Engineering (Councilor: 1997-1999, Director: 2006-2009);
The Association of Rural Planning (Director: 1996-1999, 2002-2005, 2008-2011, Inspector: 2006-2007);
Japan Society of Photogrammetry and Remote Sensing(member);
The Remote Sensing Society of Japan (Councilor: 1995-2003, Director: 2004-2005, Editing committee: 1995-2005, Chief editor: 2004-2005, Vice president: 2008-2010);
GIS Association of Japan(member);
The Japanese Society of KEIKAN (Director: 1999-present);
Rice Terrace Research Association (Director: 2006-present) Various committees

Various committees
Committee Member for National Personnel Authority, A committee specializing in examination (1992-1995, _1998-2000);
Committee Member for Ministry of Agriculture, Forestry and Fisheries, Reclamation plan for design of standard rice field Committee (1997-present);  Committee Member for Ministry of Agriculture, Forestry and Fisheries, Direct-seeding rice growing promotion committees in Japan (1995-2002)


Future Plan
An infrastructure that can support sustainable use of area resources, such as land having fundamental resources, must be developed and maintained. Water is indispensable in plans for sustainable development in consideration of the environment while developing high agricultural productivity. Therefore, I want to promote investigations in agro-environmental science to reach a state where cheap, safe and high quality food can be produced abundantly.
The first concrete study theme is productivity improvement of paddy fields. Maintenance and improvement of land productivity is important in Japan, but improvement of labor productivity is a more urgent problem. I will consider maintenance techniques for large-sized paddy fields. In foreign countries, I have focused mainly on improvement of the land productivity. I am promoting a theoretical, substantial study of SRI(System of Rice Intensification)rice farming mainly in Indonesia. I evaluated the production capacity of paddy fields developed from tropical forests in Thailand and showed an improvement technique. I investigated elimination of fluctuations of paddy-rice production in Laos. By these investigations, I try to minimize farmland area and maintain the condition of natural forests. I alsoclarified the mechanism of farmland erosion
from the viewpoint of production capacity and environmental safeguards, and I want to develop more effective maintenance measures.
Local inhabitants of farming villages manage the farmland and residential area. I investigate land use planning to enable maintenance of rural village.
Furthermore, I will evaluate overseas agricultural development projects from technical, environmental, and economic viewpoints. My aim is to construct a general evaluation system.
Messages to Students
Leave the city and go to rural area. Let’s observe the reality carefully and think deeply on it. We can experience its problems and richness.