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A field experiment was conducted at student instructional field, department of Agronomy, Faculty of Agriculture, AKS University, Sherganj, Satna (M.P.) during kharif season of 2020-21 to access the effect of different potassium levels and seedling age on growth and yield of rice. The experiment consisted of randomize block design having Factorial arrangement with three replications. In this experiment, 12 treatment combinations including four levels of potassium and treatments were K₁- 0 kg K₂O/ha, K₂- 60 kg K₂O/ha, K₃- 80 kg K₂O/ha and K₄- 100 kg K₂O/ha, while three age of seedlings were tested are D₁- 10 days old seedling, D₂- 20 days old seedling and D₃- 30 days old seedling. During the course of the study, it was found that different potassium levels and seedling age significantly affected plant height, number of leaves per plant, number of tillers per hill, length of panicle, number of grains per panicle, number of filled grain per panicle, test weight, grain & stover yield of rice. Higher plant height (92.77 cm), number of leaves per plant (59.40), number of tillers per hill (26.33) at maximum crop growth stage of 90 DAT were recorded under the transplanting of 10- days old seedling with application of potassium @ 100 kg/ha. Similarly, resulted in highest length of panicle (27.88 cm), number of grains per panicle (177.27), number of filled grain per panicle (157.73), test weight (24.27 g), grain yield/ha (63.42 q/ha) and stover yield/ha (90.14 q/ha) recorded under the transplanting of 10- days old seedling with application of potassium @ 100 kg/ha. It was concluded from the results that transplanting of 10- days old seedling with application of potassium @ 100 kg/ha improved yield and yield components of rice.

 Keywords: Biofertilizers, Varieties, Azospirillum, Panicle, Test weight, Stover yield.