The study looked at how using nano-fertilizer and different levels of nitrogen fertilizer affect the growth of Egyptian cotton in different planting times. The researchers conducted two experiments on clay soil to see the impact. They found that using nano-fertilizer along with nitrogen fertilizer increased the cotton yield significantly, especially when the cotton was planted early in the season. This shows that using nano-fertilizer can help improve cotton productivity, especially when combined with nitrogen fertilizer and planted at the right time.