A pot experiment was carried out to investigate the effects of iron and phosphorous on oat yield and uptake. Four treatments of iron (F0 = 0, F1 = 3, F2 = 6, and F3 =9 mg kg-1) and phosphorous (P0 = 0, P1 =20, P2 =40, and P3 =60 mg kg-1) were used. The maximum grain and straw yields (37.4 and 51.68 mg pot-1) were recorded under Fe2 treatment of iron. However, the highest dose (Fe3) of iron significantly decreased the grain and straw yield of oat as compared to Fe0, Fe1 and Fe2 treatments. The grain and straw yields of oats increased with increasing levels of phosphorous. The highest grain and straw yields of oats were observed at P3 treatment of phosphorous. The maximum uptake of phosphorous by oat grain and straw was noticed under P3 treatment. The application of iron also increased the utilisation of phosphorous by oat grain and straw significantly over control. The maximum value of phosphorous uptake was recorded under Fe2 treatment of iron. The Fe3 treatment of iron showed an antagonistic effect on the uptake of phosphorous by oat grain under all the treatments of phosphorous. The maximum yield of oat grain and straw was observed under Fe2 + P3 treatment. The highest phosphorous uptake by oat grain and straw was noticed under P3 + Fe2 treatment. while the highest iron uptake by oat grain was observed under P2 + Fe2 treatment.