Abstract
Genotype×environment interactions of grain yield in rice were estimated for early-maturing cultivars with high palatability. Genotype×year and genotype×location interaction of yield were significant. On the other hand, genotype×cropping season and genotype×amount of fertilizer interaction of yield were not significant. Regression coefficients obtained by Finlay-Wilkinson's method for evaluation of adaptability were the same for newly bred cultivars as check cultivars. There was only a slight difference found between newly bred cultivars and check cultivars in yield. No significant correlation was found between yield and palatability. These results show that varietal differences in yield differ under different environmental conditions as year and location and yield tests conducted under different years and locations were essential. Newly bred cultivars had the same adaptability and yield ability as high palatability check cultivars.
