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Potato (Solanum tubersum) is an important economic crop in the world. In order to investigate the effect of potassium (Potabarvar Bioferrtilizer) and Phosphorus (Barvar 2 Biofertilizer) biofertilizers on the yield and quality of two families of true potato seeds, including Fanta free pollinators and Savalan × Agria hybrids, an experiment was conducted in the form of a completely randomized block design with 8 treatments and three repetitions were done. The results showed that the use of Potabarvar Bioferrtilizer and Barvar 2 Biofertilizer affected plant height, leaf area and the dry matter percentage of tuber and leaf and led to an increase in yield compared to the control plants and the application of a mixture of biological fertilizers at the probability level of 1%. So that the highest yield in the treatment of Potabarvar biofertilizer was obtained on the free-pollinating Fanta family. Also, the application of these fertilizers led to an increase in the leaf chlorophyll index at the five percent probability level. The use of these biofertilizers led to an increase in the concentration of potassium, nitrogen and phosphorus elements in the plant at the level of 1% probability. The application of these fertilizers had a greater effect on the free-pollinating Fanta family. Also, the application of the mixture of these biofertilizers did not lead to an increase in the desired indicators. [ABSTRACT FROM AUTHOR]