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A field experiment was carried out in the College of Agricultural Engineering Sciences - University of Baghdad, during the fall season of 2021 to find
out which cultivated cultivars of maize are efficient under nitrogen fertilization.
The experiment was applied according to an RCBD (split-plot design with three
replications). The cultivars of the experiment (Baghdad, 5018, Sarah) supply
three levels of nitrogen fertilizer, which are N1 (100 kg.N/ha), N2 (200 kg.N/ha)
and N3 (300 kg.N/ha). The statistical analysis results showed the superiority of
the Sarah genotype, which gave the highest value of SOD and CAT enzymes,
reaching 11.59 units mg-1 and 10.76 units mg-1
. Protein sequentially, while cultivar5018 outperformed as it gave th
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