Abstract
ABSTRACT Changes in seed dry weight of two tropical maize hybrids, Oba Supa 1 and 2, were monitored during late maturation and seeds of Oba Supa 1 were harvested at five times between 43 and 19% seed moisture. Physiological seed quality was evaluated in laboratory tests and field trials at three planting dates. Using differences in field performance at the different dates, index of seed ageing was computed. Except for ear diameter, differences in field emergence characteristics, post-emergence growth and performance of all stages were negligible (P > 0.05). Despite negligible differences in cob diameter, ear diameter of plants from seeds of the first two maturity stages were significantly (P < 0.05) smaller than that of other stages. Maturity of seed planted affected kernel size and consequently, grain yield, of the resultant crop. Irrespective of maturity stage, however, seedling growth traits, interval between flowering stages, morphological traits, number of harvestable ears and grain yield were the tr...
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