Field experiments were carried to study the leaf number index of maize hybrids to identify the reproductive stage of six maize hybrids for application of nutrition at suitable time to improve more production was under taken at the Agricultural College farm, Bapatla during two consecutive years during rabi 2016-17 and 2017-18. The experiment was laid out in randomized block design with six maize hybrids as treatments in four replications. During both the seasons, tassel primordial initiation coincide with the 9th visible leaf in 900 M Gold and DKC 9081, 10th visible leaf in DKC 9142 and Pinnacle and 11th visible leaf in DKC 9120 and DKC 9042 with LNI of 54.54, 54.54, 53.77, 52.79, 54.62 and 54.62 respectively in first season and 53.70, 54.71, 51.85, 53.70, 55.55 and 54.71 respectively in second season.
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