The objective of the research was to analyze the variability of agronomic and seed quality components related to K fertilizer in soybean mixed populations and to analyze whether K fertilizer affected the quality of soybean seed. This study used a randomized block design with three repetitions. The main factor is the genotype consists of G1= Detam 1, G2 = Detam 2, G3 = Detam 3, G4 = Anjasmoro, G…