STUDY ON GROWTH, PHENOPHASE AND YIELD ATTRIBUTES OF MODERN AMAN RICE (Oryza sativa L.) VARIETIES

Abstract

A field experiment was conducted at the Experimental Field of Sher-e-Bangla Agricultural University, Dhaka from July to December, 2017 to investigate the comparative morphological, phenological and yield traits of some Aman rice varieties. Ten BRRI released Aman rice varieties viz. BRRI dhan40, BRRI dhan41, BRRI dhan44, BRRI dhan51, BRRI dhan52, BRRI dhan53, BRRI dhan54, BRRI dhan56, BRRI dhan57 and BRRI dhan62 were used as test crops. The experiment was laid out in RCBD design with three replications. Among the studied characters, plant height, number of total tillers hill , flag leaf length, flag leaf breath, flag leaf area, penultimate leaf length, penultimate leaf area, panicle length, 1000-grain weight, grain yield and biological yields were significantly varied due to varietal difference. BRRI dhan44 produced the highest number oftotal tillers hill -1 (21.1), flag leaf area (85.33 cm ) and penultimate leaf area (93.83 cm 2 ), productive tillers hill -1 (20.0), fertile grains panicle -1 (124.11) and least number of non- productive tillers hill (1.5) and sterile grains panicle -1 (7.39) followed by BRRI dhan54 produced the number of total tillers hill -1 (17.0), flag leaf area (74.86 cm 2 ) and penultimate leaf area (88.36 cm 2 ). BRRI dhan44 takes the minimum time for panicle initiation (70 days), booting stage(80 days), panicle emergence (83 days), 50% flowering (91 days), milky stage (100 days) and dough stage (109 days) among all Aman varieties. BRRI dhan62 produced the lowestnumber of total tillers hill (10.5), flag leaf area (37.89 cm 2 ) and penultimate leaf area (33.47 cm ). The yield contributing attributes viz. 1000-grain weight (36.38 g), The grain yield (6.23 t ha -1 ) and biological yields (15.58 t ha -1 ) were produced by BRRI dhan44which were the highest followed by1000-grain weight (35.00 g). The grain yield (5.27 t ha -1 ) and biological yields (14.23 t ha -1 ) were produced by BRRI dhan54. BRRI dhan62 produced1000-grain weight (24.13 g). The lowest grain yield (3.74 t ha -1 ) and biological yields (11.22 t ha -1 ) were produced by BRRI dhan62. 2 -1 -1 -1 2