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Abstract During the spring season of 2021, a field trial was conducted at the experimental field of the College of Agricultural Engineering Sciences - University of Baghdad (located in Abu-Ghraib site). The objective was to investigate the impact of nano-zinc concentrations and their application dates on maize yield and its components. The experiment was designed as a split-plot experiment following a randomized complete block design with three replications. The main plot was assigned to spraying dates (at 50% tasseling (D1), 50% silking stage (D2), and completion of silking stage (D3). And Zinc concentrations (0, 100, 200, and 300 mg liter-1) were assigned to the sub-plots. The results of the statistical analysis revealed a significant impact of nano-zinc application timing on all studied traits. Notably, the earliest application date (D1) resulted in the highest average ear length (17.52 cm), number of ear rows (15.46 rows per ear), and number of grains per row (29.42 grains per row), seed ear weight (87.48 grams), and total grain yield of 6.65 tons per hectare. Moreover, nano-zinc concentrations demonstrated superiority across most yield component traits and grain yield, particularly at 300 mg L -1 , This generated the highest average number of ear rows (17.82 rows per ear), grains per row (31.20 grains per row), ear grain weight (98.06 grams), and overall grain yield (7.49 tons per hectare). The study concludes that applying nano-zinc at the onset of the flowering stage is most effective, with the concentration of 300 mg L -1 standing out.
Al-Rawi et al. (Mon,) studied this question.