Changes in Yield Potential of Traditional Rice Cultivars with Variability in Plant Height, Tillers Per Plant, Fertility and Days to Maturity
A. L. Ranawake, U. G. S. Amarasinghe
Journal of Scientific Research and Reports · pp. 114–122 · Published 7 Oct 2014
10.9734/JSRR/2015/12042Abstract
Aims: To understand the changes in yield potential of traditional rice cultivars with different plant height, tillers per plant, fertility and days to maturity. Study Design: Completely randomized block design with four replicates. Twenty plants were evaluated in each replicate. Eighty plants were evaluated for each cultivar. Place and Duration of Study: Faculty of Agriculture, University of Ruhuna, Sri Lanka in 2011-2013. Methodology: Rice cultivars were grouped (trait groups) according to guidelines of standard evaluation system of the International Rice Research Institute. Rice cultivars were sub-divided as semi-dwarf (<110 cm), intermediate (110 – 130 cm) and tall (>130 cm) according to plant height and very low tillering (<5 tillers/plant), low tillering (5 – 9 tillers/plant), and medium tillering (10 – 19 tillers/plant) according to number of total tillers/plant. All the cultivars were grouped as completely sterile (0%), highly sterile (<50% to trace), partially sterile (50-74%), fertile (75-90%), and highly fertile (>90%) according to filled grain percentage. Two factor ANOVA without replications were performed to see the effect of the 3 each groups of (-plant height, -number of tillers/plant, -fertility percentage, and - days to maturity) rice cultivars on the yield. Results: Average grain yield of each group was calculated as g/plant basis. Average yield of rice cultivars linearly increased from 7.9 g/plant, 11.13 g/plant to 13.03 g/plant from the group of semi-dwarf, intermediate, to tall. Average yield recorded as 5.39 g/plant, 10.93 g/plant, and 31.28 g/plant in very low tillering, low tillering, and medium tillering groups respectively. In maturity groups, sterile category recorded the least average yield of 4.5 g/plant and partially sterile category recorded 8.0 g/plant, while fertile category recorded the highest yield, 14.9 g/plant. According to ANOVA all these trait-groups significantly (p=0.01) increased the yield of rice cultivars. Conclusion: Plant height, tillers per plant and days to maturity significantly increase the yield of traditional rice cultivars.
Cited by 2
L. Lei, H. L. Zheng, J. G. Wang · Euphytica · 2018
P. I. Kostylev, E. V. Krasnova, A. V. Aksenov · Grain Economy of Russia · 2020
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