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Agronomic performance of maize hybrids under acid and control soil conditions

Liliane N. Tandzi, Eddy M. Ngonkeu, Emmanuel Youmbi, Eric Nartey, Martin Yeboah, Vernon Gracen, Jacob Ngeve, Hortense A. Mafouasson

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Int. J. Agron. Agri. Res.6(4), 275-291, April 2015

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Abstract

Maize (Zea mays L.) is a major staple crop in Central Africa and has the potential to mitigate the food insecurity in the sub region. However, maize grain yield is severely constrained by soil acidity. One hundred and twenty one (121) hybrids was evaluated at 12 environments in Bimodal Humid Forest Zone of Cameroon from 2012 to 2014 to estimate the correlation between yield and other yield related traits, heritability, standard heterosis (SH), develop selection indices andidentify high-yielding hybrids. The overall mean yield was 3.3 t/ha in acid soil conditions and 5.3 t/ha in control environments. The mean yield reduction (YR) was 38%. Plant height, ear height, and ears per plant were highly and positively correlated with yield while anthesissilking interval, ear aspect and plant aspect were highly and negatively correlated with yield. Stress tolerance index was highly significantly correlated with yield under acid soil conditions while YR and stress susceptibility index were highly and negatively correlated. The heritability was low for all the traits under stressed environments. The SH of the hybrids ranged from -2% to 53% under acid soil and from -4% to 21% under improved soil with a pH of 5. Fifteen hybrids out yielded the best hybrid check by 10%. These high-yielding hybrids could be released after further testing on-farm.

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Agronomic performance of maize hybrids under acid and control soil conditions

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