ABSTRACT

The experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh from July-November, 2019 to evaluate the response of rice to nitrogen fertilizer scheduling in T. aman field. The experiment comprised of three varieties viz. BRRI dhan34, BRRI dhan49 and Dhani Gold and five nitrogen treatments are no nitrogen (N0), 110 kg N/ha as USG (N1), 110 kg N/ha as Prilled Urea (1/3 at Basal + 1/3 at 30 DAT + 1/3 at 45 DAT) (N2), 110 kg N/ha as Prilled Urea (1/3 at 15 DAT + 1/3 at          30 DAT + 1/3 at 45 DAT) (N3) and 110 kg N/ha as Prilled Urea (1/4 at 15 DAT + 1/4 at 30 DAT + 1/4 at     45 DAT + 1/4 at 60 DAT) (N4). The experiment was laid out in a randomized complete block design (RCBD) with three replications. The highest result for plant height (146.0 cm) was found for BRRI dhan-34 with    110 kg N/ha as prilled urea (1/4 at 15 DAT + 1/4 at 30 DAT + 1/4 at 45 DAT + 1/4 at 60 DAT) (N4). The highest number of total tiller hill-1 (10.80), 1000 grain weight (24.11 g), grain yield (6.937 t ha-1), straw yield (7.513 t ha-1) and biological yield (14.45 t ha-1) were found in Dahani gold with 110 kg N/ha as prilled urea (1/4 at 15 DAT + 1/4 at 30 DAT + 1/4 at 45 DAT + 1/4 at 60 DAT) (N4). The highest harvest index (48.61%) was found for BRRI dhan-49 with 110 kg N/ha as prilled urea (1/3 at 15 DAT + 1/3 at 30 DAT + 1/3 at       45 DAT) (N3). The result indicated that hybrid variety Dhani gold yielded the highest, while fine rice variety BRRI dhan34 yielded the lowest.

Key words: Rice, prilled urea, grain yield, T. aman season