ABSTRACT
 
A field experiment was conducted in a randomized complete design with three doses of Nano-powder potassium sulfate(100, 150 and 200 g per vine) and one dose of traditional potassium sulfate (200 g per vine), which applied as soil applications to compare the effect of potassium at nano or traditional form on the performance of Crimson seedless grapevines during 2018 and 2019 seasons. Results revealed that the Nano-powder potassium sulfateat 150 and 200g per vine was better than the traditional form in enhancing vegetative growth, nutrient uptake, cluster quality and yield of Crimson seedless grapevines. In summary, it can be concluded that utilizing a nano form of potassium sulfate at an equal dose of traditional form or by less than fifty gram lead to an increase in the productivity of Crimson seedless grapevines.