David Johnson

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David JohnsonDavid is IRRI Representative for South East Asia. He is also the leader for Sustainable Rice-based Production Systems theme and head of the Crop and Environmental Sciences Division (CESD).

David has experience in rice farming systems in Central America, West Africa, and Asia. He is recognized internationally for his work on weed management in rice; he has also authored or co-authored over 70 scientific papers and two books.

He is involved in projects in Myanmar on reducing risks and raising livelihoods in rice environments through improved knowledge of environment and management in the Ayeyarwaddy Delta and Central Dry Zone.


  • Weed management and ecology
  • Smallholder systems
  • Rice establishment options
  • Unfavorable rice environments
  • Tropical agronomy


  • PhD in Cropping Systems, University of Wales (1987)
  • MSc in Agricultural Extension, Reading University (1981)
  • BSc in Agriculture, Wye College, London University (1980)


  • Principal Scientist, IRRI (2016- )
  • Head, Crop and Environmental Sciences Division, IRRI (2013-present)
  • Coordinator, Consortium for Unfavorable Rice Environments (CURE), IRRI (2007-present)
  • Senior Scientist, Weed Science, IRRI (2003-present)
  • Principal Scientist, NRI, University of Greenwich, UK (1999-2003)
  • Weed scientist, WARDA, Côte d'Ivoire, West Africa (1992-2000)
  • Agronomist, Sumatra, Indonesia (1988-1991)
  • Cropping System Agronomist, Belize, Central America (1981-1986)


  1. Singh Y, Singh VP, Singh G, Yadav DS, Sinha DKP, Johnson DE, Mortimer AM. 2011. The implications of land preparation, crop establishment method and weed management on rice yield variation in the rice-wheat system in the Indo-Gangetic plains. Field Crops Research, 121: 64-74.
  2. Chauhan BS, Johnson DE 2010. The role of seed ecology in improving weed management strategies in the tropics. Advances in Agronomy, 105: 221-262
  3. Namuco OS, Cairns JE, Johnson DE. 2009. Investigating early vigour in upland rice (Oryza sativa L.): Part I. Seedling growth and grain yield in competition with weeds Field Crops Research: 113, 3: 197-206
  4. Peña-Fronteras JT, Villalobos MC, Baltazar AM, Merca FE, Ismail AM, Johnson DE. 2009. Adaptation to flooding in upland and lowland ecotypes of Cyperus rotundus, a troublesome sedge weed of rice: tuber morphology and carbohydrate metabolism. Ann. Bot. 103:295-302.
  5. Rao AN, Johnson DE, Sivaprasad B, Ladha JK, Mortimer AM. 2007. Weed management in direct-seeded rice. Adv. Agron. 93:153-255.
  6. Mazid MA, Riches CR, Mortimer AM, Wade LJ, Johnson DE. 2006. Improving rice-based cropping systems in north-west Bangladesh. In: Proceedings 15th Australian Weeds Conference, Australian Weed Science Society Conference, Adelaide, Australia, 25-28 September 2006. p 331-334.
  7. Johnson DE, Kent RJ. 2002. The impact of cropping on weed species composition in rice after fallow across a hydrological gradient in West Africa. Weed Res. 42:89-99.
  8. Becker M, Johnson DE. 2001. Cropping intensity effects on upland rice yield and sustainability in West Africa Nutrient Cycling in Agroecosystems, 59, 2: 107-117
  9. Johnson DE, Dingkuhn M, Jones MP, Mahamane MC. 1998. The influence of rice plant type on the effect of weed competition on O. glaberrima and O. sativa. Weed Res. 38:207-216.
  10. Johnson DE. 1997. Weeds of rice in West Africa. West Africa Rice Development Association, Bouake, Côte d'Ivoire. 312 p.

David Johnson
Dr. David Johnson

Head, Crop and Environmental Sciences Division (CESD)

International Rice Research Institute
Los Baños, Laguna

+63 2 580 5600
ext 2771