EFFECT OF DATE OF TRANSPLANTING ON GROWTH AND YIELD PERFORMANCE OF SELECTED HYBRID AND INBRED RICE VARIETIES IN BORO SEASON

Abstract

A field experiment was conducted at the research field of Sher-e-Bangla Agricultural University (SAU), Dhaka. during the period from November 2009 to June 2010 to investigate the effect of variety and date of transplanting on morpho-physiological characters, yield attributes and yields of hybrids and inbred rice varieties in Boro season. The experiment comprised of three hybrid varieties viz., Hira2, Moron and Tia along with an inbred variety, BRRI dhan29, and four dates of transplanting viz.. 01, 16 and 31 January and 15 February. The experiment was laid out in two factors randomized complete block design with three replications. The growth parameters such as leaf area, total dry matter production and absolute growth rate, morphological and phenological parameters, yield contributing characters and grain yield were significantly influenced by the date of transplanting. Results revealed that leaf area, total dry matter, absolute growth rate, plant height, straw yield, number of unfilled grains paniele4, days required to flowering and maturity were hier when transplanted on 01 January than those on 16. 31 January and 15 February. In contrast, the lowest values of the parameters were recorded when transplanted on 15 February. The maximum grain yield was recorded when transplanted in mid-January owing to increased grains panicle' and harvest index, where as the lowest grain yield was recorded when transplanted on 15 February due to inferiority in yield contributing characters. Among the varieties, I-Iira2 showed superiority in leaf area (LA), and total dry matter (1DM) production, straw yield and absolute growth rate which resulted the superior performance of yield attributes thereby increasing grain yield. In contrast, Tia produced the lowest grain yield for its inferior performance of yield attributes.