The study looked at how different amounts of nitrogen and phosphorus fertilizers affect the growth and yield of oil flax plants in irrigated fields. They found that using low nitrogen and medium phosphorus fertilizers led to the highest increase in plant growth. The best combination for maximum dry matter accumulation and grain output was high nitrogen and medium phosphorus fertilization. Overall, using nitrogen at 150kg/hm2 and phosphorus at 150-225kg/hm2 can help increase the growth and yield of oil flax plants.