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EFFECT OF PLANT POPULATION AND NITROGEN FERTILIZATION ON GROWTH AND YIELD OF LATE-SOWN COTTON IN NIGERIA
Abstract:
Field experiments were conducted for a three-year (1979-81) period at Samaru (between 11°11’N and 07°38’E, 666 m above mean sea level) and Mokwo (o9°l8!N and 05°04’E, 152 m above mean sea level) in the northern and southern Guinea savanna zones, respectively, to study the effect of cultivar, plant population, and nitrogen fertilization on growth and yield of late-sown cotton (late July). ‘Super okra’ consistently outyielded ‘Samaru 71’ and ‘Bar 14/25 throughout the three-year period at both locations, ‘Super okra’ which responded favourably to higher population density was also found to be more early maturing than the other two cultivars. Seed cotton yield increased significantly with application of nitrogen. The economic optimum level of N was found to be 64.0 kg N ha-1 for both locations but 40 kg N ha -1 could be used by the hoe farmers profitably. At Samaru, increased plant population resulted in increased seed cotton yield but the reverse was true at Mokwa location. The optimum plant population for ‘Samaru 71’ was —1 108,000 plants ha and that of ‘Super okra’ was 149,500 plants ha-1 However, at Mokwa, the optimum population was outside the range of plant population tested. vii July-sown cotton responded favourably to a row spacing of 75 cm at Mokwa as compared to the currently recommended spacing of 90 cm. The interaction between cultivar and plant population was significant on seed cotton and lint yields at Mokwa only in 1979 growing season. Similarly the interaction between nitrogen level and plant population was significant on seed cotton yield at Samaru in 1980 growing season alone. The major yield contributing characters were: average number of mature bolls per plant, LAI at 15 weeks after sowing (WAS) average number of fruiting branches m-2 at 15 WAS, average boll weight, plant height and total dry -2 matter m .
EFFECT OF PLANT POPULATION AND NITROGEN FERTILIZATION ON GROWTH AND YIELD OF LATE-SOWN COTTON IN NIGERIA
