GROWTH, YIELD AND QUALITY OF TRANSPLANTED AMAN RICE UNDER DIFFERENT NITROGEN LEVELS

Abstract

A field experiment was conducted at the Agronomy farm, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, during July 2017 to December 2017 in Aman season to examine the effect of different nitrogen levels on growth, yield and quality of transplanted aman rice. The experiment consisted of three nitrogen levels (viz. 50 kg N ha -1 , 100 kg N ha -1 and 150 kg N ha -1 ) and four varieties/lines (viz. SAU ADL1, BRRI dhan70, BRRI hybrid dhan6 and SAU ADL11). The experiment was laid out in split-plot design with three replications. Nitrogen levels were allocated in main plots and varieties/lines in sub-plots. Results revealed that different growth characters, yield and yield contributing characters and quality characters of transplanted aman rice were significantly influenced by nitrogen, variety and their interactions. Increasing trend was observed with the increasing level of nitrogen from 50 kg ha -1 to 150 kg ha in case of all crop growth characters. The highest 1000 grains weight (27.29 g), grain yield (4.50 t ha -1 ), straw yield (8.00 t ha -1 ) and biological yield (12.78 t ha -1 ) were obtained from 150 kg N ha -1 which were statistically at par with 100 kg N ha -1 . The highest harvest index (36.58%) was recorded at 100 kg N ha -1 . Maximum hulling percentage (78.66) and milling outturn (75.81%) were recorded from 150 kg N ha -1 while the highest protein content (9.60%) was obtained from 100 kg N ha -1 . The highest leaf area index (7.40), dry matter hill -1 (99.85 g) and 1000 grains weight (31.49 g) were obtained from SAU ADL1 while highest grain yield (5.24 t ha -1 ) and harvest index (45.44%) were recorded in BRRI hybrid dhan6. Highest hulling percentage (77.74), milling outturn (75.79%), protein content (9.90%), gel consistency (96.32 mm) and lowest imbibition ratio (4.10) were recorded from SAU ADL11. So considering nutritive value and quality purpose, SAU ADL11 has a great potentiality to the breeders. Interaction of 150 kg N ha with BRRI hybrid dhan6 gave maximum value of all studied parameters but BRRI dhan70, SAU ADL1 and SAU ADL11 were more responsive to 100 kg N ha -1 to produce better yield and quality rice.

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