Estimation of productivity in some of maize cultivars under the influence of different level of nitrogen

Abstract

A field experiment was carried out in the fields of the College of Agricultural Engineering Sciences - University of Baghdad during the fall season of 2021, with the aim of knowing which cultivated varieties are more tolerant of a decrease or increase in nitrogen fertilization of the yellow corn crop. The main plots  included nitrogen levels and secondary cultivars with three replications and using three cultivars  (Baghdad, 5018, Sarah) and adding three levels of nitrogen fertilizer, which are N1 (100 kg.N/ha^-1), N2 (200 kg.N/ha^-1) and N3 (300 kg.N/ha^-1). The results of the statistical analysis are  showed the superiority of the cultivar (Sarah) in the characteristic of leaf area and chlorophyll index, as its averages were (6756.6 cm²) and (590.27 mg. m²), respectively. There were no significant differences between the cultivars in  grain yield and nitrogen utilization efficiency. The two cultivars (5018) and (Sarah) superior  in the characteristic of plant height, as they gave an average of (197 cm). In addition to , the results of the statistical analysis are  showed that the nitrogen level N3 was superior in the plant height, leaf area, chlorophyll icontent , and grain yield, as its averages were (207 cm, 7268.8 cm 2, 690.72 mg m 2, 14880 kg ha^-1), respectively, while the nitrogen level N1 was superior in the nitrogen use efficiency. It gave an average of (91.5).