The study looked at how different amounts of nitrogen fertilizer affect the growth and yield of a specific type of hybrid rice. They found that using 90-135 kg/ha of nitrogen fertilizer led to the best balance of plant growth, grain production, and efficient use of nitrogen. Too little nitrogen resulted in more grains per plant, while too much nitrogen led to lower grain weight and seed production. Overall, using the right amount of nitrogen fertilizer can help hybrid rice plants grow well, produce a good yield, and use nitrogen efficiently.