The research was carried out at SAU, Tando Jam. Our findings revealed notable differences in flaxseed growth and yield. We evaluated the impact of different N levels and potassium levels of 55 kg/ha and 55 kg/ha on the growth and yield of line seed. The study employed nine distinct potassium and nitrogen concentrations, and applied the subsequent treatments to the variety PR-75. T1 is the control group that doesn't use fertilizers. T2 is equal to 30 kg/ha (N) plus 20 kg/ha (K), T3 is equal to 35 kg/ha (N) plus 25 kg/ha (K), T4 is equal to 40 kg/ha (N) plus 30 kg/ha (K), T5 is equal to 45 kg/ha (N) plus 35 kg/ha (K), T6 is equal to 50 kg/ha (N) + 40 kg/ha (K), T7 is equal to 55 kg/ha (N) + 45 kg/ha (K), T8 is equal to 60 kg/ha (N) + 50 kg/ha (K), T9 is equal to 65 kg/ha (N) + 55 kg/ha (K). The present study's results indicate that T9, which is equivalent to 65 kg/ha (N) + 55 kg/ha (K), yielded the best results, exhibiting a maximum plant height of 95.00, the highest number of branches (5.70), a dry weight (g/plant) of 12.53, and the highest crop growth rate (g/m2/day). The results indicate a relative growth rate of the plant (g/g/day) of 0.018. The test weight (g) was 8.76, the seeds/capsule ratio was 9.40, the number of capsules per plant was 45.00, the seed yield (t/ha) was 1.19, and the stove yield (t/ha) was 0.5. It is concluded that administering 65 kg/ha of nitrogen and 55 kg/ha of potassium exhibited advantageous effects on both the growth and yield of flaxseed, surpassing the untreated control group, which received no fertilization.