© Global Journal Of Pure And Applied Sciences . 2007. Vol. 13 No. 3
Publisher: Bachudo Science Co. Ltd
The Effects of Nitrogen Rates On Phenology and Yield Components of Early Maturing Maize Cultivars
D. T. Gungula, A. O. Togun, J. G. Kling
KEYWORDS: Maize. nitrogen, phenology, yield, anthes1s
ABSTRACT:Two field experiments were conducted during the 1996 and 1998 cropping seasons to determine the effects of N stress levels on the phenology and yield components of early maturing maize cultivars. Seven early maize cultivars were tested against five N rates (0 30, 60, 90 and 120 kg N ha· The N stress levels significantly affected phenological traits ( days to 50% anthesis, silking and maturity, anthesis-silking interval (ASI) and grain filling period} and yield components (shelling percent, 1000 grain weight and harvest index) measured. For all these traits. there were better performances at 90 and 120 kg N ha 1 Days to 50% anthesis decreased from 51 days at O kg N ha· 1 to 48 days at 120 kg N ha· 1 in 1996 season and from 54.5 to 46.2 at the same N levels in 1998 season. Maturity was delayed for 7.1 days at O kg N ha 1 compared to 120 kg N ha· 1 in 1998 season. Grain yield increased with increased N rates with R2 values of 0.92 and 0.86 in 1996 and 1998 cropping seasons, respectively. The different cultivars reacted differently to the N rates factors for both the phenological traits and yield components. Such cult1vars as TZECOMP4C2 and TZECOMP5C5 had the longest grain filling period in both seasons (432 and 34.8, respectively in 1998 season) In both seasons. EV89731-SR had the longest ASI AC89DMRESRW and TZECOMP3C2 had the highest harvest index In both seasons with the highest values of 40.8 and 39.6, respectively in 1996 season.
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