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An investigation was carried out during the year 2015 -16 to study and determine the role of potassium forms in relation with K uptake studies in soils of different cropping systems in Kurnool district. Existence of different forms of potassium in the investigated soils have the following order :fixed K > non-exchangeable K >available K> exchangeable K >water soluble K. All forms of potassium were highest in maize-maize cropping system and lowest in groundnut-groundnut cropping system. The plant parameters i.e dry matter, K content and K uptake of maize crop were highest in Srinagaram village of maize-maize cropping system and lowest in Balapalapalli village of groundnut –groundnut cropping system. The maximum and positive correlation of plant parameters was found with non-exchangeable K .

Key words: Potassium forms, Maize, Dry matter, K content and K uptake.