The study looked at how different levels of nitrogen fertilizer affected the growth and yield of two types of rice plants. They found that using more nitrogen fertilizer led to better stem and leaf characteristics, increased chlorophyll content, and higher grain yield. The erect-panicle variety performed better than the curved-panicle variety in terms of plant growth and grain yield. Overall, applying nitrogen fertilizer improved the health and productivity of the rice plants, especially in the erect-panicle variety.