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
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, 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, 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. (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..