Abstract:
Present investigation was carried out at Natore Sugar Mills area, Natore, Bangladesh during 2014-15 to
evaluate the growth and yield responses of hybrid maize varieties under different levels of nitrogen
fertilization. Two hybrid maize varieties viz. BARI hybrid maize-7 and BARI hybrid maize-9 were
tested under four nitrogen levels (N0= without external nitrogen supply, N1= 115 kg N ha-1
, N2= 230 kg
N ha-1
, and N3= 345 kg N ha-1
). All recommendations agronomic practices were used for both the
variety. Yield and yield traits (plant height, plant girth, total leaves plant-1
, effective leaves plant-1
, non effective leaves plant-1
, total root plant-1
,straw weight plant-1
,cob length, grain free cob, cob girth, grain
line cob-1
, total grain cob-1
, grain number line
-1
,1000-grains weight, grain weight cob-1
,grain yield, straw
yield and biological yield) were measured during and on the completion of the study. BARI hybrid
maize-9 achieved maximum yield (10.99 t ha-1
) and it was followed by the BARI hybrid maize-7 (10.37
t ha-1
). Results of study revealed that yield traits and final yield significantly increased with increasing
nitrogen fertilizer from 0 to 345 kg ha-1
. Among various tested N-fertilizer doses, highest grain yield was
obtained from the plot treated with N3 treatment (345 kg ha-1
) but it was not statistically differing from
the N2 treatment (230 kg ha-1
). Therefore, N2 treatment (230 kg ha-1
) could be recommended for variety
BARI hybrid maize-9 as the best economical nitrogen level for maximum economical yield of maize.
