EFFECTS OF IRRIGATION SCHEDULING ON GROWTH AND YIELD OF BORO RICE IN BANGLADESH

The field experiment was conducted at the field laboratory of the Department of Soil Science, Bangladesh Agricultural University (BAU), Mymensingh during Boro season (January 2015-May 2015) evaluating the growth and yield of 5 Boro rice varieties under two irrigation approaches. The experiment was laid out in a two factors Randomized Complete Block Design (RCBD). Factor 'A' represented five varieties, viz. V₁ (BRRI dhan28), V₂ (BRRI dhan29), V₃ (Binadhan-5), V₄ (BR14) and V₅ (BR58) and factor 'B' represented two irrigation approaches, viz. I₁ (application of irrigation at 8 days intervals), I₂ (application of irrigation at physiological stages. The experimental field consists of 30 plots to apply 10 treatments with 3 replications for each treatment. Recommended doses of all fertilizers were applied in each plot. Here, growth and yields of Boro rice were significantly (<.001) influenced by variety. Plant height (97.45cm), number of effective tillers hill^-1 (14.50), number of non-effective tillers hill^-1 (1.933), straw yield (6.403 t ha^-1) and biological yield (12.32 t ha^-1) were the highest in V₃ (Binadhan-5). The panicle length (23.10 cm), grain yield (7.06 t ha^-1) and dry root weight (1.58 t ha^-1) were highest in V₂ (BRRI dhan29). Number of filled grain panicle^-1 (154.7), unfilled grain panicle^-1 (29.57) and harvest index (60.45 t ha^-1) were highest in V₅ (BRRI dhan58). Thousand grain weight, grain yield and harvest index were significantly (<.001) influenced by irrigation approaches. Thousand grain weight, grain yield and harvest index were increased significantly under I₁ (application of irrigation at 8 days intervals) over I₂ (application of irrigation at physiological stages).