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Yoshida Lab
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The lab goes out into the field to think about agriculture and the sustainable management of water.
AboutAbout the lab
Learning from the field: sustainable management of water resources
The Yoshida Lab (Agro-Environmental Science Lab) studies the sustainable management of water resources, with a focus on the relationship between agriculture and water.
Much of the water people use goes to agriculture, and nutrients from sources such as fertilizer flow into rivers and lakes, causing problems such as algal blooms.
The lab's mission is to propose solutions that balance development and conservation, so that agriculture can continue while a healthy water cycle is maintained.
Through fieldwork in Thailand, Laos, Indonesia, and other countries, the lab aims to help students develop the ability to see things from multiple perspectives.
Key terms
- Nutrients
- Components such as nitrogen and phosphorus that plants and algae need to grow. In excess, they can pollute water.
- Rainfed paddy field
- A paddy field without irrigation such as canals, where rice is grown relying only on rainwater.
- Denitrification
- The process in which soil microorganisms convert nitrogen compounds into nitrogen gas, which is released into the atmosphere.
NewsLab news
Recruiting students interested in climate change and farmers' adaptation strategies
Chapter 11 contributed to an Asian Development Bank book on water resources management and culture
Master's student wins Outstanding Paper Award and Best Poster Award at ICERD2024
Paper published on new dam development and hydropower generation in the Nam Ngum River Basin, Laos
ResearchResearch themes
The lab aims to maintain a healthy water cycle while sustaining agricultural production. To that end, it draws on all available knowledge and methods to propose optimal solutions that balance development and conservation.
*Illustrative imageDrought Risk Hazard Maps
In the Asian monsoon region, most farmland consists of rainfed paddy fields, which makes rice production unstable. By combining hydrological cycle models and crop models, the lab creates drought risk hazard maps and evaluates how much the risk is reduced when adaptation measures are introduced.
*Illustrative imageReducing Heat Damage to Rice Through Water Management
In paddy fields, water management can be used to regulate water temperature and ease cold damage and heat damage. The lab develops models that predict paddy water temperature and rice growth from weather data, identifies when and how much to irrigate for the greatest effect, and applies the results to regional water management planning.
*Illustrative imageCarbon and Nitrogen Cycles in Paddy and Upland Fields
Carbon and nitrogen cycles in paddy and upland fields are determined by soil moisture and temperature. Using crop growth models and water and heat transport models, the lab evaluates the amount of denitrification and methane emissions in paddy fields under different water management, as well as the amount of nutrients flowing out of upland fields.
MembersFaculty
The members of the Yoshida Lab consist of faculty members, doctoral students, and master's students.As of 2026
- ProfessorKoshi YoshidaPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Rice terraces BOGOR” Blue tooth7 / CC BY-SA 3.0 (cropped)
- Drought Risk Hazard Maps: “Parched rice field Can Tho” Dragfyre / CC BY-SA 3.0 (cropped)
- Reducing Heat Damage to Rice Through Water Management: “Paddy fields in Dinajpur District 01” Kritzolina / CC BY-SA 4.0 (cropped)
- Carbon and Nitrogen Cycles in Paddy and Upland Fields: “Green rice sheaves planted in a paddy field with long shadows at golden hour in Don Det Laos” Basile Morin / CC BY-SA 4.0 (cropped)
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