Dr Jhoana Opena

Research Academic

School of Agriculture and Food Sustainability

j.opena@uq.edu.au

Researcher biography

Dr Jhoana Opena joined the School of Agriculture and Food Sustainability as a Postdoctoral Research Fellow in 2021. Dr Opena has more than 15 years of experience on research in IPM in vegetables and weed management in rice-based cropping systems in Australia, Philippines and Cambodia. Previously she worked as an Associate Scientist in the Weed Science group of the International Rice Reseacrh Institute and was appointed as an Adjunct Associate Professor at the University of the Philippines in Los Banos. She finished her Doctor of Philosophy in Agriculture at Charles Sturt University in Wagga Wagga, Australia in 2021. Currently she is working on an ACIAR project entitled " Weed management techniques for mechanised and broadcast lowland crop production systems in Cambodia and Lao PDR".

Publications

Book Chapter (1)

Journal Articles (12)

Conference Papers (3)

Thesis (1)

Book Chapter

Kumar, Virender, Opena, Jhoana, Valencia, Katherine, Thi, Ho Le, Nguyen, Hong Son, Donayre, Dindo King, Janiya, Joel and Johnson, David E. (2017). Rice weed management in Southeast Asia. Weed Management in Rice in the Asian Pacific Region. (pp. 282-307) Hyderabad, India: Asian-Pacific Weed Science Society.

Journal Articles

Opena, Jhoana, Pratley, James, Lemerle, Deirdre, Wu, Hanwen and McCormick, Jeffrey (2021). Potential of winter pasture legume in rice rotations to mitigate barnyard grass (Echinocloa crus-galli) impacts in temperate Australia. Agricultural Science, 79-91.

Ahmed, Sharif, Opena, Jhoana L and Chauhan, Bhagirath S (2015). Seed Germination Ecology of Doveweed (Murdannia nudiflora) and Its Implication for Management in Dry-Seeded Rice. Weed Science, 63 (2), 491-501. doi: 10.1614/WS-D-14-00115.1

Chauhan, Bhagirath Singh, Opena, Jhoana and Ali, Jauhar (2015). Response of 10 elite “green super rice” genotypes to weed infestation in aerobic rice systems. Plant Production Science, 18 (2), 228-233. doi: 10.1626/pps.18.228

Opena, Jhoana L., Quilty, James R., Correa, Teodoro Q. and Chauhan, Bhagirath S. (2014). Weed population dynamics, herbicide efficacies, and crop performance in a sprinkler-irrigated maize-rice cropping system. Field Crops Research, 167, 119-130. doi: 10.1016/j.fcr.2014.07.014

Opena, Jhoana L, Chauhan, Bhagirath S. and Baltazar, Aurora M. (2014). Seed germination ecology of echinochloa glabrescens and its implication for management in rice (Oryza sativa L.). PLoS ONE, 9 (3) e92261, e92261.1-e92261.9. doi: 10.1371/journal.pone.0092261

Chauhan, B. S. and Opena, J. (2013). Weed management and grain yield of rice sown at low seeding rates in mechanized dry-seeded systems. Field Crops Research, 141, 9-15. doi: 10.1016/j.fcr.2012.11.002

Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Effect of plant spacing on growth and grain yield of soybean. American Journal of Plant Sciences, 04 (10), 2011-2014. doi: 10.4236/ajps.2013.410251

Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Effect of plant geometry on growth and yield of corn in the rice-corn cropping system. American Journal of Plant Sciences, 04 (10), 1928-1931. doi: 10.4236/ajps.2013.410237

Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Management of volunteer corn seedlings in dry-seeded rice. American Journal of Plant Sciences, 04 (12), 2381-2385. doi: 10.4236/ajps.2013.412294

Chauhan, B. S. and Opena, J. (2013). Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems. Field Crops Research, 144, 225-231. doi: 10.1016/j.fcr.2012.12.014

Chauhan, B. S. and Opena, J. (2012). Effect of tillage systems and herbicides on weed emergence, weed growth, and grain yield in dry-seeded rice systems. Field Crops Research, 137, 56-69. doi: 10.1016/j.fcr.2012.08.016

Chauhan, Bhagirath S. and Opea, Jhoana (2012). Growth of purple nutsedge (cyperus rotundus) in response to interference with direct-seeded rice. Weed Technology, 26 (3), 506-509. doi: 10.1614/WT-D-12-00007.1

Conference Papers

Opena, Jhoana, Pratley, James, McCormick, Jeffrey, Wu, Hanwen and Lemerle, Deirdre (2019). Pasture legumes offer promise to control barnyard grass in delayed permanent water systems in rice. 2019 Agronomy Australia Conference, Wagga Wagga, NSW, Australia, 25 – 29 August 2019.

Opena, Jhoana, Wu, Hanwen, Moroni, Sergio, Lemerle, Deirdre and Pratley, James (2018). Allelopathic potential of pasture legume species and selected winter crops on barnyard grass and rice. 21st Australasian Weeds Conference, Manly, Australia, 2-12 September 2018. The Weed Society of New South Wales Inc..

Bunquin, Michelle Anne, Onoya, Jerone, Chauhan, Bhagirath, Opena, Jhoana and Beebout, Sarah (2015). Persistence of oxadiazon residues in soil and grains in an upland rice (Oryza sativa) field. Unknown, Unknown, Unknown. Washington, DC United States: American Chemical Society.

Thesis

Opena, Jhoana (2021). Impacts of pasture legume phase on the seed bank, establishment and growth of barnyard grass (Echinochloa crus-galli) in drill sown rice. PhD Thesis, School of Agricutural, Environmental and Veterinary Sciences, Charles Sturt University.

Areas of research

Plant and crop science