EFFECT OF FLAG LEAF CLIPPING ON GROWTH, YIELD AND YIELD ATTRIBUTES OF HYBRID RICE IN BORO SEASON

Abstract

The experiment was conducted at the Experimental Field of Agricultural Botany Department, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh, during October, 2017 to May, 2018 to study the effect of flag leaf clipping on growth, and yield attributes of hybrid rice. Six hybrid rice varieties (viz. BRRI Hybrid dhan1, BRRI hybrid dhan2, Heera2, Heera4, Nobin and Moyna) were used for this study. The experiment was laid out in split plot Design with three replications. All the test varieties exhibited superiority in control condition. The tallest plant (115.2) cm was recorded from Moyna at harvest stage and higher individual flag leaf area (81.61cm 2 ) was observed from Heera4. Penultimate leaf area and third leaf area (78.98 cm 2 and 46.95cm 2 , respectively) were obtained from BRRI hybrid dhan2. The highest number of leaves (67.33) and spikelet panicle -1 (219) were observed from Heera4. Among test rice varieties, higher grain yield (6.01t ha -1 ) and biological yield (13.45 t ha -1 ) were also observed from Heera4. Days to maturity was significantly varied from 123 (Nobin) to 145 (BRRI Hybrid dhan1) among the studied varieties. Chlorophyll content (SPAD value) in penultimate leaf after 15 days after heading, grain filling duration, yield contributing characters and yield were collected after cutting of flag leaf. Regardless of variety, all the studied parameters were exhibited superiority in compared to control treatment. Chlorophyll and nitrogen content (1.35% to 17.27%) in penultimate and grain filling duration were increased (4.5 to 6.25 days) due to clipping of flag leaf. The highest number of effective tillers hill , filled grains panicle -1 , weight of 1000 grains, grain yield, straw yield, biological yield were recorded from Heera4 under control condition. The clipping of the flag leaf reduced grain yield from 15.69 % to 29.43 % in the test hybrid rice varieties. -1