Grain yield potential and associated traits in maize (Zea mays L.) varieties in the forest zone of Nigeria
2000
Agbaje, G.O., Institute of Agricultural Research and Training (Obafemi Awolowo University), Moor Plantation, PMB 5029, Ibadan, Nigeria | Abayomi, Y.A., Department of Crop Production, University of llorin, PMB 1515, Ilorin, Nigeria | Awoleye, F., Department of Crop Production, University of llorin, PMB 1515, Ilorin, Nigeria
Grain yield and 15 associated traits were studied in 10 maize varieties (DMR-L-SR-W, SUWAN I, EV 9043- DMR, TZPB-SR, TZSR-Y, 8321-18, 8535-23, 8644-27, 8644-31, and 8805-4) from 1995 to 1997 at Ibadan, Nigeria. Varietal differences and the relationship between grain yield and associated traits were determined. Variety 8321-18 with the highest grain yield had a 27 per cent yield advantage over the lowest-yielding variety TZSRy. Crop growth rates at vegetative and reproductive stages were highest in TZSR-Y while its harvest index was lowest when compared to other varieties, 8321-18 had longer ear and kernel growth duration than most varieties evaluated, and its harvest index was higher than TZSR-Y. Kernels per plant were more in 8321-18, 8805-4, and EV 9043-DMR than in the other varieties. Positive correlations were found between grain yield and kernels per ear (r=0.70***), kernel rows (r=0.30***) and kernels per row (r=0.63***), harvest index (r=0.53**), total dry matter (r=0.50***), ear grQwth duration (r=0.36***), kernel growth duration (r=0.30***), and crop growth rate at reproductive stage (r=0.17**), except days to 50 per cent silking (r=-0.19*). To improve grain yield, the biological traits that are significantly associated with grain yield could be incorporated into a model for developing improved maize genotypes for the forest zone in Nigeria
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