GROWTH AND YIELD OF AMAN RICE VARIETIES AS AFFECTED BY DIFFERENT METHODS OF UREA APPLICATION

Abstract

A field experiment was conducted at Agronomy field laboratery, Sher-e-Bangla Agricultural University (SAU), during July- December, 2010 with a view to fmd out the varietal performance of aman rice as affected by different methods of urea application. The experimental treatments included four varieties i.e. BRI I, BRRI dhan33, BRRI dhan39, BRRI dhan46 and four urea application methods viz. 15 kg N hi' as prilled urea at final land preparation + 15 kg N hi' as prilled urea at 30 DAT+ 15 kgN hi' as prilled urea 50 DAT; 15 kgN hi' as prilled urea at 7 DAT + 15 kg N hi' as prilled urea at 30 DAT + 15 kgN ha 4 as prilled urea at 50 DAT; 60 kg N hi' USG (1.8 g) at 7 DAT; 15 kg N hi' as prilled urea at 15 DAT+ 15 kg N hi' as prilled urea 30 DAT+ 15 kg N hi' as prilled urea at 50 DAT. The experiment was laid out in a split- plot design with three replications having urea application in the main plots and variety in the sub-plots. The results showed that urea fertilizer application method significantly influenced plant height, tillering production, leaf area index, effective , unfilled grains panicl&', total grains panicle', tillers hilr', filled grains panicle 4 1000-grain weight, grain yield, straw yield, biological yield and harvest index. Application of USO N as at 7 DAT gave highest yield (7.82 t hi') while application of 15 kg N hi' as prilled urea 30 DAT+ 15 kg N hi' as prilled urea at 50 DAT gave Varitetal influence were significant on tillering pattern, leaf area index, effective tillers hill 4 , filled grains panicl&',lOOO- grain weight, grain yield, lowest yield (4.88 t hi'). hi') which was statistically similar with BRRI dhan46 (7.3 t hi') while the lowest yield obtained straw yield and biological yield. BRI1 gave the highest yield (8.17 t from BRRI dhan33 (2.87 t hi'). Interaction effect of 1.8 g USO along with BR1 1 showed the highest effective tillers hilr' (14.00), 1000-grain weight (30.32 g), grain yield (10.67 t hi'), straw yield (12.00 t hi') and biological yield (22.67 t hi').