A study was conducted at the Department of Horticulture, KNUST, Kumasi from June to
November, 2015 with the objectives to (i) determine the rate of ATONIK plant growth
regulator (PGR) suitable for high yield of two varieties of hybrid rice (ii) determine the
combined effects of PGR rates and varieties on the growth and yield performance of hybrid
rice. A 2 x 5 factorial arrangement in randomized complete block design with three
replications was used. The factors were varieties at two levels: Agra Rice and Jasmine 85
and PGR at five levels: ATONIK at 450 ml/ha, ATONIK at 500 ml/ha, ATONIK at 550
ml/ha, ATONIK at 0 ml/ha and GA3 at 60 ml/ha. Comparing the ATONIK rates with the
GA3, ATONIK at 450 ml/ha resulted in a 14.3 % increase in the number of rice panicles.
Application of ATONIK at 450 ml/ha, 500 ml/ha and 550 ml/ha resulted in 14.4%, 10.7%
and 4.4% higher percentage of productive tillers, respectively, than that produced by GA3
at 60 ml/ha. ATONIK at 450 ml/ha application led to a 17.8 % increase in grain yield. For
the harvest index, application of ATONIK at 450 ml/ha resulted in the highest harvest
index of 45 %, significantly greater than the other PGR treatments. In conclusion, the study
clearly demonstrated that ATONIK PGR was superior to GA3 in the vegetative and
productive performance of rice. The most suitable rate of ATONIK for increased rice
productivity was 450 ml/ha.
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