INFLUENCE OF METHODS OF NITROGENOUS FERTILIZERS USE AND VARIETIES ON GROWTH AND YEILD OF BORO RICE

Abstract

A field experiment was conducted at Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from November, 2008 to June, 2009 to study the ‘Influence of methods of nitrogenous fertilizer use and varieties on growth and yield of boro rice’. The experiment comprised as two factors viz. (1) Factor A – Variety: 3 levels; (i) V1 = ACI Hybrid dhan 1, (ii) V2 = BRRI dhan29 and (iii) V3 = BRRI hybrid dhan2; and (2) Factor B – Methods of urea application: 4 levels; (i) T1 = 2.7 g size USG placement at 8 DAT, (ii) T2 = 1.8 g size USG placement at 8 DAT + Prilled urea plot-1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT, (iii) T3 = 1.8 g size USG placement at 8 DAT + foliar spray plot-1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT and (iv) T4 = 0.9 g size USG placement at 8 DAT + Prilled urea plot-1 (37.5 g for V1 and V3 and 22.5 g V2) at 30 DAT + foliar spray plot-1 (37.5 g for V1 and V3 and 22.5 g for V2) at 50 DAT. The experiment was laid out in Split-plot design with three replications. BRRI hybrid dhan2 (V3) showed the highest plant height (108 cm), number of tillers hill-1 (23.98), number of leaves hill-1 (91.09), dry weight hill-1 (84.14 g), leaf area index (7.12), panicle length (26.58 cm), number of grains panicle-1 (131.20), 1000 seed weight (26.12 g), grain yield (4.79 t ha-1), straw yield (6.80 t ha-1), biological yield (11.6 t ha-1) and harvest index (41.25%) at harvest. With different methods of urea application, the tallest plant was recorded by T4 (109.80 cm at harvest) but for other parameters; T1 gave the highest number of tillers hill-1 (24.67), number of leaves hill-1 (90.41), dry weight hill-1 (83.22 g), leaf area index (6.83), panicle length (26.38 cm), number of grains panicle-1 (128.2), 1000 seed weight(25.73 g), grain yield (4.67 t ha-1), straw yield (6.72 t ha-1), biological yield (11.39 t ha-1) and harvest index (40.66%). With the combined effect of different boro rice variety and methods of urea application the tallest plant was achieved by V1T4 (110.7 cm at harvest), but for other parameters; the highest number of tillers hill-1 (28.00 at harvest), number of leaves hill-1 (100.20 at harvest), dry weight hill-1 (90.59 g at harvest), leaf area index (7.87 at harvest), panicle length (27.06 cm), number of grains panicle-1 (146.20), 1000 grain weight (26.79 g), grain yield (5.41 t ha-1), straw yield (7.20 t ha-1), biological yield (12.61 t ha-1) was at V3T1. So, V3T1 (BRRI hybrid dhan2 × 2.7 g size USG placement at 8 DAT) was the best treatment under the present study.