EFFECT OF SUBMERGENCE ON THE REPRODUCTIVE STAGE AND YIELD OF DIFFERENT AMAN RICE VARIETIES

Abstract

The experiment was conducted at the Agricultural Botany field of central research farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from June 2018 to December 2018 to find out the effect of submergence on the reproductive stage and yield of different Aman rice varieties. Four Submergence conditions at reproductive stage viz. S 0 – Control (No submergence), S 1 – Submergence for 4 days, S 2 - Submergence for 7 days, S 3 - Submergence for 10 days and five varieties viz. V 1 = FR13A, V 2 = BRRIdhan 52, V 4 = BRRIdhan 46, V 5 = BINAdhan 12 were used as treatment of the experiment. The pot experiment was laid out in Split Plot Design having two factors and replicated four times. Significant effect was found in case of different submerged conditions, varieties and their interaction. In Interaction effect it was found that the highest plant height, number of leaves and number of tillers per plant, SPAD value, no. of leaf before and after emergence of panicle were recorded from the S 0 (Control treatment with variety BRRIdhan 52). The highest leaf, stem and root (18.6 g, 22.20 g and 5.02 g, respectively) dry weight were recorded from the treatment S 0 at harvest. The highest no. of effective tillers and filled grains (13.85 and 150.39) and the lowest number of ineffective tillers and unfilled grains (2.05 and 20.51) were recorded from the S 0 V 3 . The highest grain yield, straw, biological yield (4.81, 6.17 and 10.98 t ha ) and harvest index (43.84 %) were recorded from the S 0 V 3 (Control treatment with BRRIdhan 52) and the lowest (1.70, 4.23 and 5.99 t ha -1 ) were recorded from S 3 V 2 (Submergence for 10 days in BR 5). Therefore, it is concluded that BRRIdhan 52 was superior in Aman season in consideration of growth and yield attributes among the mentioned five varieties with submerged condition. BRRIdhan 52 ultimately leads to the higher dry matter production. Panicles hill -1 , effective tiller, filled grain

and 1000-grain weight are the determinants for the higher grain yield of the BRRIdhan 52. = BR5, V 3 V 3 V 3 -1