RESPONSE OF IRRIGATED WHEAT TO THE PLACEMENT METHODS OF PRILLED AND SUPER GRANULAR UREA

Abstract

A field experiment was carried out at the Agronomy Farm, Sher-e-Bangla Agricultural University (SAU), Dhaka during rabi season of 2010-2011 to study the effect of prilled urea and urea super granule on the growth and yield of wheat under irrigated condition. The experiment consisted of sixteen treatments as T =Prilled urea (PU) broadcasted@100 kg N ha -1 during sowing

, T = PU placed in the side furrow@100kg N ha -1 during sowing, T 3 2 =PU placed between two rows@100kg N ha -1 during sowing, T =PU & seed in the same furrow@100kg N ha -1 during sowing, T 5 4 =Urea Super Granule (USG) at 5 cm depth as basal@75kg N ha -1 , T 6 =USG placed at 5 cm depth at 10 DAS@75kg N ha -1 , T =USG placed at 5 cm depth at 20 DAS@75kg N ha -1 , T 8 7 =USG placed at 5 cm depth at 30 DAS@75kg N ha -1 , T 9 =USG placed at 10 cm depth as basal@75kg N ha -1 , T =USG placed at 10 cm depth at 10 DAS@75kg N ha -1 , T 11 10 =USG placed at 10 cm depth at 20 DAS@75kg N ha -1 , T 12 =USG placed at 10 cm depth at 30 DAS@75 kg N ha , T 13 =USG placed at 15 cm depth as basal@75 kg N ha -1 , T =USG placed at 15 cm depth at 10 DAS@75kg N ha -1 , T 15 14 =USG placed at 15 cm depth at 20 DAS@75kg N ha -1 and T 16 =USG placed at 15 cm depth at 30 DAS@75 kg N ha -1 . Application of PU and USG as nitrogen fertilizer had significant positive effect on growth, yield and yield contributing characters of wheat. The tallest plant (97.73 cm), maximum effective tillers sprike -1 (6.67) and higher total dry matter (11.86 g plant ) were recorded in T 11 ( USG placed at 10 cm depth at 20 DAS@75 kg N ha ) than other treatments.

This treatment also produced significantly higher grains spike (42.33), 1000-grains weight (40.11 g), grain yield (4.00 t ha -1 -1 ), straw yield (5.31 t ha ) and biological yield (9.31 t ha -1 ) followed by T 10 (3.80 t ha -1 )

treatment. The highest harvest index (45.45%) was obtained from T (USG placed at 5 cm depth 10 DAS@ 75 kg N ha -1 6 ) treatment. The use of USG was found more effective to minimize production cost as well as increase yield. Hence the rate of N @ 75 kg N ha in the

-1 -1 -1 -1 -1 1 form of USG along with other fertilizer may be considered as a suitable management for obtaining higher yield of irrigated wheat.