Research theme for competitive and other funds (3)：
2011 - 2016 Development of comparison and standardization technique in SRI cultivation in Southeast Asia from the viewpoint of Agricultural Engineering
2012 - 2015 A basic study for measurements of in situ soil enzymatic activities
2010 - 2011 A water-saving agricultural technology using passive underground watering and retaining moisture in residual roots
Papers (34)：
Ryoichi Doi. Hue-shifting for accurate and precise quantification of biochemical substances using diagnostic test strips. Coloration Technology. 2021. 137. 5. 530-543
Ryoichi Doi. Assessing the reforestation effects of plantation plots in the Thai savanna based on 45 cm resolution true-color images and machine learning. ENVIRONMENTAL RESEARCH LETTERS. 2021. 16. 1
Ryoichi Doi. Synergistic Effects of Pseudocolor Imaging, Differentiation, and Square and Logarithmic Conversion on Accuracy of Quantification of Chemical Characteristics Using Test Strips and Similar Products. Analytical Letters. 2019. 52. 10. 1519-1538
Ryoichi Doi. Maximizing the Accuracy of Continuous Quantification Measures Using Discrete PackTest Products with Deep Learning and Pseudocolor Imaging. Journal of Analytical Methods in Chemistry. 2019. 2019
DOI Ryoichi, SAHUNALU Pongsak, WACHRINRAT Chongrak, TEEJUNTUK Sakhan, SAKURAI Katsutoshi. Changes in soil bacterial community profiles associated with deforestation in the Sakaerat Environmental Research Station, Thailand: comparisons between soils of the original forest and bare ground. Tropics. 2004. 14. 1. 39-53
DOI Ryoichi, SAKURAI Katsutoshi. Soil environmental factors relating to diversity of culturable soil bacterial communities in the Sakaerat Environmental Research Station, Thailand. Tropics. 2003. 12. 3. 185-200
