EFFECT OF NITROGEN ON GROWTH AND YIELD OF SHORT DURATION TRANSPLANTED INBRED AND HYBRID RICE VARIETIES

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during June to December 2015 with a view to finding out the effect of nitrogen levels on the yield performance of short duration inbred and hybrid transplant rainy season rice varieties. Four short duration rice varieties (three inbred viz. BINA dhan7, BRRI dhan39, BRRI dhan56 and one hybrid Dhanigold), and 5 levels of nitrogen viz. 0, 40, 80, 120 and 160 kg N ha-1 were included in the experiment under a split–plot design with three replications. The result revealed that variety, nitrogen rate and their interactions had significant on grain yield of short duration transplant rainy season rice. Hybrid variety Dhanigold gave the highest yield (5.13 t ha-1) followed by BRRI dhan56 (4.80 t ha-1) while the lowest was produced by Binadhan-7 (4.28 t ha-1). The highest yield (5.93 t ha-1) was obtained from Dhanigold with 120 kg N ha-1 which was followed by BRRI dhan56 at 120 kg N ha-1 (5.42 t ha-1). The highest yield was attributed to the increased production of effective tiller and grains panicle-1. The optimum dose of nitrogen estimated for Binadhan-7, BRRI dhan39, BRRI dhan56 and Dhanigold are 131.31, 122.97, 126.50 and 133.14 kg ha-1, respectively. Thus, this study concludes that the highest yield of short duration rice varieties Binadhan-7, BRRI dhan39, BRRI dhan56 and Dhanigold could be obtained by applying nitrogen at 131.31, 122.97, 126.50 and 133.14 kg ha-1, respectively.