PERFORMANCE OF HIGH YIELDING RICE VARIETIES OF BANGLADESH

Abstract

The performance of BRRI dhan28, BRRI dhan47, BRRI dhan50 and one exotic rice variety Koshihikari (Japanese) was observed in boro season from November, 2011 to May, 2012. The varieties were evaluated on growth, yield and yield contributing characteristics of rice. In the early stages of growth viz. 60 DAS, 70 DAS and 90 DAS Koshihikari variety had the maximum plant height. BRRI dhan47 was the tallest (93.20 cm) and Koshihikari was the shortest plant (78.32 cm) at the time of harvest. In the early stage (60 DAS) the tiller number hill-1 was maximum for the BRRI dhan28 (12.48) and in the time of harvesting Koshihikari had the maximum tiller number hill-1(16.08). Koshihikari was the earliest variety compare to the other varieties because it took the minimum time for booting (73.8 DAS), flowering (85.8 DAS), grain maturity (113.2 DAS) and harvesting (124 DAS). The effective tiller number per hill-1 was significantly higher for the Koshihikari variety (16.08) from the other three high yielding varieties of Bangladesh. The longest panicle length had been observed in BRRI dhan47 (22.62 cm) and shortest was found in Koshihikari (14.91 cm). The number of spikelet and grain panicle-1 was highest for the BRRI dhan50 (136.12 and 119.34 respectively) and minimum for Koshihikari (66.42 and 59.57 respectively). BRRI dhan47 had the maximum 1000-grain weight (22.23 g) and BRRI dhan50 had the minimum (17.32 g). The maximum yield was found in BRRI dhan47 (7.61 t ha-1) and the lowest yield was observed in Koshihikari (5.60 t ha-1). The straw yield and biological yield was highest for the BRRI dhan50 and lowest for Koshihikari. The harvest index was found maximum in Koshihikari (59.67 %) and minimum in BRRI dhan50 (52.57 %).