EFFICACY OF DIFFERENT COMBINATIONS OF NITROGENOUS FERTILIZER AND VERMICOMPOST ON YIELD AND QUALITY OF AROMATIC RICE

Abstract

The study was conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from June to December 2019 to assess the proper combination of vermicompost and nitrogenous fertilizer on yield and grain quality of aromatic rice. Aromatic rice cultivars BRRI dhan37, BRRI dhan38, and BRRI dhan80 were used as the test crops in this experiment. This experiment consisted of two factors: Factor A: T 1 : 100% N through urea, T 2 : 90% N through urea + 10% N through vermicompost, T 3 : 80% N through urea + 20% N through vermicompost, T 4 : 70% N through urea+30% N through vermicompost, T 5 : 60% N through urea + 40% N through vermicompost and Factor B: Aromatic rice variety (3 varieties) as- V 1 : BRRI dhan37, V 2 : BRRI dhan38, and V 3 : BRRI dhan80. The two factors experiment was laid out in split-plot design with three replications. The five combinations of nitrogenous fertilizer and vermicompost were assigned in the main plot and 3 aromatic rice varieties in the sub-plot. Results exposed that different combinations of vermicompost and nitrogenous fertilizer and/or different varieties had a significant effect on most of the yield and quality contributing parameters. Effective tillers, filled grains, grain yield, protein content, proline content, and grain 2-AP content increased with an increasing rate of vermicompost level. Among the three varieties, BRRI dhan80 produced a maximum number of filled grains panicle , 1000 grain weight, and grain yield while BRRI dhan37 produced maximum protein, proline, and 2-AP content. Among the treatment combinations, the highest number of effective tillers hill -1 (14.81) was found from T 5 V 3 and the lowest (9.56) from the T 1 . The highest grain yield (4.94 t ha -1 ) was found from T 5 V 3 -1 , whereas the lowest (3.09 t ha ) was recorded from the T 1 V 2 . The highest protein content (12.29%) was recorded from T 5 V 1 and the lowest (8.58%) was observed from the T 1 V 2 . The highest amylose content (24.32%) was observed from T 1 V 3 , while the lowest (20.04%) was found from the T 5 V 2 . The highest proline content (25.09mg g -1 ) was observed from T 5 , while the lowest (21.44 mg g -1 ) was found from the T 1 V 2 . The maximum grain 2-AP content (0.99µg g -1 ) was recorded from T 5 V 1 and the lowest (0.89 µg g -1 ) was observed from the T 1 V 1 . From the 15 treatment combinations, T 5 V 3 and T 4 V 3 produced maximum yield however 70% N through urea+30% N through vermicompost may be used for producing maximum yield. Although T 5 V 1, T 5 V 2, T 5 V 3 and T 4 V 1 showed excellent performance when considering proline, and 2-AP content but farmer may use 70% N through urea+30% N through vermicompost for the production of good quality aromatic rice.