VARIETAL CHARACTERIZATION AND YIELD EVALUATION OF SIX RICE HYBRIDS (Oryza sativa L.) GROWN IN BANGLADESH

Abstract

A field experiment was conducted with six hybrids cultivated in Bangladesh and two modern check varieties of rice (Oryza sativa L.) at Sher-e-Bangla Agricultural University experimental farm, to perform varietal characterization and to carry out of yield evaluation based on different morphological characters during the period of January 2006 to May 2006. The experiment was laid out in a randomized complete block design with three replications. In the experiment plant height for BRRI dhan 28 was highest (101.5 cm) and lowest for hybrid Richer (82.5 cm). For days to 50% flowering BRRI dhan 29 required maximum days (116.3 days) and BRRI dhan 28 required lowest days (95 days) but hybrid showed intermediate. For number of effective tillers, Hira showed maximum performance (17.7) and Sonarbangla 1 showed lowest performance (13.3). For days to maturity, Sonarbangla 1 required lowest days (118 days) and BRRI dhan 29, highest days (148 days). In panicle length status, Richer showed maximum performance (27.7 cm) and for BRRI dhan 28 (26 cm) was the lowest. Number of filled grains was the highest for BRRI dhan 29 (163.3) whereas, Jagoron only 118. Number of total grains was highest in BRRI dhan 29 (201.7) and for Jagoron it was only 133.7. On the other hand, for 1000-grain weight, Aloron was the best than others (28.8 g). In biological yield/plant (g), BRRI dhan showed highest yield (49.6 g) and Hira only 18 g. For harvest index, Jagoron was the best (64%) and for BRRI dhan 28 only 38%. For grain yield/plant Aloron expressed highest performance (47.87 g), whereas, BRRI dhan 28 it was only 30.45 g. Grain yield/plot, Aloron was the best than others. For grain yield/ha, Aloron was the best (7.4 t) than others. In yield advantage for plot basis Aloron was the best (54.45%) over BRRI dhan 28 and 24.75% over BRRI dhan 29, respectively. Maturity was also earlier for Aloron than other hybrids. Among the all hybrids, Aloron was the best in terms of grain yield/ha. High heritability was found for days to maturity (99.93%). The maximum variation was found in biological yield per plant (12-81 g). In correlation analysis a highly significant positive association were found for plant height, days to maturity, days to 50% flowering, panicle length and filled grains per panicle with grains/panicle, grain yield/ha.