其他摘要：The present piece of research work was carried out at the field of Sher-e-Bangla Agricultural University, Dhaka-1207, from December 2010 to May 2011 to determine optimum irrigation levels for the hybrid maize varieties. There were four hybrid maize varieties: V 1 (BARI Hybrid Maize-5), V 2 (Pacific 60), V 3 (NK 40) and V 4 (Ajanta) and three levels of irrigation: I 1 = Two irrigations at 25 and 50 DAS, I 2 = Three irrigations at 25, 50 and 75 DAS and I 3 = Four irrigations at 25, 50, 75 and 100 DAS, respectively. Almost all the plant and yield contributing characters showed significant variation except days to 6 leaf stage and days to bud initiation stage. The maximum yields were recorded in V 1 I 3 (7.92 t ha -1 ) which was statistically identical to V 4 I 3 (7.83 t ha -1 ), V 2 I 3 (7.45 t ha -1 ), V 1 I 2 (7.40 t ha -1 ), V 2 I 2 (6.87 t ha -1 ) and V 4 I 2 (6.80 t ha -1 ), respectively. The highest benefit cost ratio (BCR) was observed (2.37) in both V 1 I 3 and V 1 I 2 treatment combination. Moreover, total average water saving in one hectare land for maize cultivation by adopting I 2 irrigation treatment over I 3 is 4,49,837 gallons. Among the treatment combinations, V 1 I 3 (BARI Hybrid Maize-5 with three irrigations at 25, 50 and 75 DAS) was the suitable combination in terms of grain yield and economic return for maize cultivation. Bangladesh Agron. J. 2015, 18(2): 23-29
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