The result revealed that plant height, number of branches, number of leaves, number of nodules, TDM were improved by the level and timing of K application. Among the treatments application of 60 and 80 kg/ha in split registered significant increase of the above growth character in groundnut crop which reflected a higher value of LAI, LAD, CGR and RGR. The physiological traits for stress tolerance of a crop significantly influenced by the level of K and timing of its application. A significant increase of these traits was noticed when the level of K was increased up to 80 kg/ha and applied to groundnut crop in splits except RWD which decreased significantly with increase in the level of K application. The highest value of these biochemical characteristics of groundnut crop were recorded at 80 kg/ha when applied in splits at sowing and flowering. The seed yield in groundnut increased significantly with increase in the level of K application due to increase in number of pods per plant, shelling percentage and kernel weight and the highest yield registered among the treatments at 80 kg/ha when applied in split. In view of the positive and beneficial effect of K application in groundnut crop it may be concluded that improvement in the productivity of groundnut crop under residual soil moisture condition can be possible through split application of K up to 80 kg/ha.