Abstract
The experiment was conducted at the Laboratory, Department of Plant Production, Faculty of Agriculture at the University of Azzaytuna, Tarhuna Libya during February - March 2022. The objective of the experiment was studying the relation between seed size, water imbibition rate, and germination speed in some genotypes of Bambara groundnut. The dataset used for this experiment was based on four genotypes and three replicates. The results showed that there was a gradual increase in the rate of seed water imbibition. It turned into a sharp increase and so on until reached the stage of stability to start the chemical processes of germination in all genetic structures. In addition, the results showed that there was a difference between the genotypes in the speed of germination, the BBL 1.1 genotype was faster in germination than the other genotypes and more efficient for water use. whilst genotype SS 3.4.2 is significantly different in the dry weight of seeds and size of seeds, where it had the highest dry weight of seeds, and the biggest size of seeds compared to other genotypes. Plus, it was noted a difference between genotypes in water imbibition rate, as structural changes during imbibition typically found in genotypes were observed, the seed size had a significant effect on the imbibition rate, where the small seeds were able to imbibe a greater percentage of water at a faster rate, wherefore were germinating and emerging more rapidly than either the medium or large seeds. Consequently, genotypes gave different responses to the water imbibition rate and germination speed. Keywords: Bambara groundnut, seed size, water imbibition rate, germination speed