Among the genotypes, fresh and aged seeds of maize hybrid COH(M) 5 attained maximum germination in shortest duration with highest speed of germination followed by UMI 285 and then UMI 61 (B and C of Figure-1).However, as in the case of days for 50% germination, fresh seeds primed with 1% KH2PO4 for 6hrs attained the maximum germination 1.3 days earlier than unprimed seeds, whereas aged seeds primed with 1% KH2PO4 for 6hr attained maximum germination 1.5 days earlier than unprimed seeds.