Agronomic performance of hybrids of white low-nitrogen maize (Zea mays L.) inbred lines under managed nitrogen environments

D. Ogunniyan, C. Alake, F. Anjorin, S. Makinde

Abstract


This study evaluated the agronomic performance of 150 single cross hybrid maize under no-N, low-N and optimum-N as 0, 30 and 90 kg ha-1, respectively, in a replicated trial laid out in a 19 × 8 lattice design in 2014 and 2015. Data collected were pooled across years and subjected to analysis of variance for each N level. Pearson’s correlation was used to study the relationships between grain yield (GY) and other traits while Spearman’s rank correlation was used to detect the association among the GY under the three N levels across years. Effects of genotypes and G × E (genotype x environment) were significant (P<0.01) for most of the traits under all the N levels. Grain yield and ear height (EH) increased while days to silking (DTS), anthesis-silking-interval (ASI), stay green (SG), plant aspect (PASP) and ear aspect (EASP) decreased with increase in N levels. Days to anthesis (DTA) were highest under no-N (59.30 days) than under low-N (57.98 days) and optimum-N (57.58 days). Plant height (PH) was lower under no-N than under low-N and optimum-N levels. The DTS, ASI, SG, PASP and EASP responded most to changes in N conditions, hence are effective in maize selection for N stress. The GY can be indirectly selected for any of DTS, PH, EH and SG under N stress, but PASP or EASP under optimum-N condition. Hybrids BD74-170×BD74-55, TZEI1×BD74-399 and BD74-175×BD74-152 were most promising under the three N conditions, and may be considered for use in a wide range of environments.

Keywords


Hybrid, low nitrogen, maize, nitrogen stress, Zea mays

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