EFFECT OF DOUGH STAGE SUBMERGENCE ON THE YIELD OF HIGH YIELDING RICE VARIETIES

Abstract

The pot experiment was conducted at the Agricultural Botany field area of central research farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from December, 2013 to April, 2014 to find out the effect of dough stage submergence on the yield of high yielding rice varieties. Treatments included in the two factors experiment were as follows: factor A: Submergence period- S1 – Control/No submergence, S2 – Submergence for 4 days, S3 - Submergence for 9 days, S4 - Submergence for 14 days and factor B: varieties- V1 – BRRI dhan 28, V2 – BRRI dhan 29, V3 – BRRI hybrid dhan 2, V4 – BRRI hybrid dhan 3, V5 – TIA (an exotic variety). The experiment was laid out in Randomized Complete Block Design (RCBD) with five replications. Results showed that plant height, number of tiller plant-1, number of fresh leaves plant-1, number of rotten leaves plant-1, 1%, 50%, 100% booting stage, 1%, 50% panicle initiation stage, 1%, 50%, 100% milking stage, days to maturity, weight of leaf, weight of leaf sheath, weight of root, weight of stem, panicle length, number of fertile panicles plant-1, number of infertile panicles plant-1, number of fertile seeds plant-1, number of infertile seeds plant-1, number of fertile grains tiller-1, number of unfertile grains tiller-1, 1000 grains weight, weight of fertile grains plant-1, weight of unfertile grains plant-1 was significantly influenced by submergence and/or rice varieties. Among the treatment combinations maximum plant height, number of tillers plant-1 and panicle length were recorded from rice plants of S1V5 irrespective of growing condition. The maximum number of fertile seeds plant-1, 1000 grains weight and weight of fertile grains plant-1 were found when no submergence with the normal cultivation of exotics hybrid variety TIA was practiced. Among the varieties BRRI hybrid dhan 2 can be suggested for possible submergence condition for 9 days and BRRI hybrid dhan 3 can be suggested for possible submergence condition up to 14 days.