Nitrogen (N) is a major limiting factor associated with maize production in sub-Saharan Africa. Low N tolerant hybrids can absorb and utilise N from the soil as well as applied fertilisers, making them efficient users of N. This study focused on identifying inbred lines with desirable GCA for grain yield and other agronomic traits under low N, determining the gene action governing grain yield and other agronomic traits under low N and estimating the genotypic variability for grain yield and other agronomic traits among extra early maize hybrids.