Effect of solar radiation regime, season and location on yield components of popularly grown rice (Oryza sativa L.) genotypes
2018
Mercado, M.A. | Perdiguera, K.N. | Marajas, I.R.; | Hernandez, J. | de Guzman, L.E. | Sta. Cruz, P.
Solar radiation is one of the environmental factors that limit the formation of yield components in rice due to its effect on storage organ formation and grain filling, which are different processes necessary for the production of grain. In this study, three rice genotypes (Mestiso19, NSIC Rc222 and PSB Rc18) were planted in five different environments: (1) 2014 wet season at Muñoz, Nueva Ecija; (2) 2015 dry season at Muñoz, Nueva Ecija; (3) 2014 wet season at Musuan, Bukidnon; (4) 2014 wet season at Los Baños, Laguna and (5) 2015 dry season at Los Baños, Laguna to determine the effect of solar radiation at a particular growth stage on each yield component. Variability in average incident solar radiation from each environment was observed in five environments. Analysis of variance showed significant differences in the genotype x environment interaction for panicle m-2, 1000 grain weight and harvest index. Correlation analysis for dry season environments showed that the number of spikelets per panicle showed positive relationship with solar radiation during reproductive stage while percentage filled spikelets demonstrated strong positive relationship with solar radiation during ripening stage. In the wet season environments, strong positive relationship was observed with solar radiation during ripening stage. This study confirms that the number of spikelets per panicle is greatly influenced by the solar radiation intercepted by the crop during the reproductive stage and the percentage of filled spikelet is due to the solar radiation during the ripening stage of the crop.
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