AGRONOMIC TRAITS AND YIELD COMPONENTS ASSOCIATED WITH BROADCASTED AND TRANSPLANTED HIGH-YIELDING RICE GENOTYPES

The study was done to identify agronomic traits and yield components associated with high-yielding rice genotypes grown under transplanted and broadcasted methods using the seed rate of 50 kg/ha (BC50) and 25 kg/ha (BC25) and transplanting (TP) in an irrigated area during the dry season. Used as tests genotypes were two hybrids (Bigante and SL8), two inbreds (PSB Rc82, IR72) and a new plant type (IR72967-12-2-3). Results showed that grain yield were consistently higher under BC25 than under TP, ranging from 0.5 to 2.5 t/ha among genotypes. Harvest index accounted for 21.3% of grain yield increase under BC25 and higher harvest index was obtained between hybrid genotypes, particularly SL8. SL8 produced fewer panicles in the three crop establishment methods but had the highest average number of filled grains per panicle. Positively associated with grain yield, filled grains per panicle accounted for 91.27% of the variation in yield as shown in the stepwise regression analysis. Total dry matter accounted for 78.6% yield increase and was also positively associated with grain yield. Grain yield under SL8 and Bigante was higher among the genotypes due to their higher efficiency in partitioning dry matter as measured through harvest index and sink strength index.