TILLERING, DRY MATTER ACCUMULATION AND PRODUCTIVITY OF HYBRID RICE IN AMAN SEASON

Abstract

A field experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University during July to December 2010 to find out the effect of 1, 2 or 3 seedling(s) per hill on growth. yield and yield components of a modern inbred (BRRI dhan49) and four hybrid (BRRI hybrid dhan2. Heera, La and Aloron) transplant Atnan rice varieties. The experiment was laid out in factorial randomized complete block design with three replications. Results showed that rice cultivars differed significantly in all growth characters, such as, plant height, tillers number, chlorophyll content, dry matter weight of different plant pafls, panicle length, filled grain, unfilled grain, grain filling percentage, 1000-grain weight, grain yield and straw yield. All the varieties exhibited higher amount of chlorophyll over inbred BRRI dhan49 in their flag leaf. Leaf dry matter, stem dry matter and total dry matter accumulation ability higher in inbred BRRI dhan49 compared to all studied hybrid rice varieties. The inbred variety BRRI dhan49 produced the highest grain (5.58 t hi') and straw yield (8.13 t hi'). Numbers of seedling(s) per hill had remarkable influence on number of total tillers per hill and total dry matter production and single seedling per hill gave the highest grain yield (4.20 t hi'). The higher grain yield was attributed mainly to the number of effective tillers per hill, filled grains per panicle and 1000-grain weight. Remarkable grain and straw yield were found from the interaction of BRRI dhan49 planted 1 seedling per hill.