Abstract
A field experiment was conducted at Agriculture Research Farm, College of agriculture, University of
Sargodha and National Agricultural Research Centre, Islamabad to compare maize hybrids (H) and
nitrogen (N) rates, growth, yield and yield components, using a split plot design with three
replications in 2017 and 2018. The main plots were supplemented with one of the following levels of
N (kg ha-1
: 100 (N1), 175 (N2), N3 (250), N4 (325), and N5 (400) using three different hybrids (H),
H1 (P-3939), H2 (30-T-60), and H3 (30-Y-87) in the sub-plots. Data were analyzed using the MIXED
procedures of SAS. The statistical models included the individual effects of N and H, the interactions
between N and H, and the random effect of the year. Orthogonal polynomial contrasts were
constructed to determine the optimum level of N. The yield and yield components were improved at
325 kg N ha-1 with significant effects on maximum plant height, number of grains per cob, number of
grains per m2
and grain yield. The results revealed that yield, total number of grains m-2
, number of
grains per cob, 1000 grains weight, number of grain rows per cob, cob girth, and cob length were
maximized (P < 0.001) at the N4 level without having an interaction with the H of maize crop. It was
concluded that the selection of best H for each location at 325 kg N ha-1
can be used to enhance the
efficiency of maize yield in autumn season at both locations under irrigated conditions.
Muhammad Imran, Amjed Ali, Muhammad Ehsan Safdar. (2021) The impact of different levels of nitrogen fertilizer on maize hybrids performance under two different environments, Asian Journal of Agriculture and Biology, Volume-09, Issue-2.
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