1. Aichi Agricultural Research Center (2007) Guidebook for the V-furrow No-Till Direct Seeding of Rice, 4th edition. https://www.pref.aichi.jp/nososi/seika/singijutu/singijiyutu74-4-7.pdf [In Japanese].
2. Consortium for a Low-cost Paddy Rotation System in Northern Kyushu (2016) Technical manual on rice, wheat and soybean rotation with general use of up-cut rotary tillage based on direct seeding of rice. https://www.naro.affrc.go.jp/publicity_report/publication/files/c66cbc61d4cbeccdfae83e09b0c8d46e.pdf [In Japanese].
3. FAO (2017) Food and agriculture data, Trade/Crops and livestock products/Export quantity. http://www.fao.org/faostat/en/#data.
4. Fukami, K. et al. (2014a) Use of a leakage prevention technique on a direct-seeded dry paddy field in a warm region. J. Jpn. Soc. Agric. Mach. Food Eng., 76, 341-347 [In Japanese with English summary].
5. Fukami, K. et al. (2014b) Water leakage prevention technique on a direct-seeded dry paddy field in a warm region by roller compaction. http://www.naro.affrc.go.jp/laboratory/karc/prefectural_results/files/H26_1_suiden.pdf [In Japanese].