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Crop Science Abstract - CROP BREEDING & GENETICS

Nitrogen Uptake and Utilization in Contrasting Nitrogen Efficient Tropical Maize Hybrids


This article in CS

  1. Vol. 47 No. 2, p. 519-528
    Received: May 15, 2006

    * Corresponding author(s): m.banziger@cgiar.org
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  1. Mosisa Workua,
  2. Marianne Bänziger *b,
  3. Gunda Schulte auf´m Erleyc,
  4. Dennis Friesend,
  5. Alpha O. Diallob and
  6. Walter J. Horstc
  1. a Bako Agricultural Research Center, P.O. Box 03, Bako, West Shoa, Oromia, Ethiopia
    b CIMMYT-Kenya, P.O. Box 25171, Nairobi, Kenya
    c Institute of Plant Nutrition, Univ. of Hanover, Herrenhaeuser Str. 2, D 30419 Hanover, Germany
    d CIMMYT-Ethiopia, P.O. Box 5689, Addis Ababa, Ethiopia


Maize cultivars with improved grain yields under nitrogen (N) stress are desirable for sub-Saharan African maize growing environments. This study assesses N uptake, N utilization, and the genotype × environment (G × E) interaction of 16 tropical maize (Zea mays L.) hybrids differing in grain yield under low-N conditions. Hybrids were evaluated under low-N, medium-N, and high-N at Harare, Zimbabwe, in 2003 and 2004 and at Kiboko, Kenya, in 2003. At maturity, N accumulation in the aboveground biomass ranged from 47 to 278 kg N ha−1 in various experiments. Grain yields ranged from 1.5 to 4.3 Mg ha−1 and 10.6 to 14.9 Mg ha−1 for the same experiments, respectively. Significant G × E interactions were observed which became more pronounced as the difference in N stress intensity between two environments increased. High grain yield under low-N was consistently associated with higher postanthesis N uptake, increased grain production per unit N accumulated, and an improved N harvest index. Additive main effect and multiplicative interaction analysis identified hybrids with specific adaptation to either low-N or high-N environments. Several hybrids produced high yields under both low-N and high-N conditions. More detailed studies with these hybrids are required to examine the underlying physiological mechanisms contributing to the N-use efficiency.

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