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Nitrogen Uptake and Utilization in Contrasting Nitrogen Efficient Tropical Maize Hybrids

^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

View larger version (15K): [in this window] [in a new window]   Figure 1. Additive main effect and multiplicative interaction (AMMI) biplots for grain yield of 16 hybrids (H) evaluated under three N levels each at Harare, Zimbabwe, 2003 (Z03N1, Z03N2, Z03N3), Kiboko, Kenya, 2003 (K03N1, K03N2, K03N3) and Harare, Zimbabwe, 2004 (Z04N1, Z04N2, Z04N3). IPCA, interaction principal component analysis axis.

View larger version (19K): [in this window] [in a new window]   Figure 2. Relationships between grain yields of 16 maize hybrids (H) at Harare high-N and low-N. Results are means of Harare 2003 and 2004. Broken lines represent mean grain yield.

View larger version (29K): [in this window] [in a new window]   Figure 3. Mean N uptake (NUP) of 16 hybrids evaluated under three N levels each at Harare, Zimbabwe, 2003 (Z03N1, Z03N2, Z03N3), Kiboko, Kenya, 2003 (K03N1, K03N2, K03N3) and Harare, Zimbabwe, 2004 (Z04N1, Z04N2, Z04N3).

View larger version (14K): [in this window] [in a new window]   Figure 4. Relationships between (A.) N uptake (NUP), (B.) N utilization (NUT, kg dry grain/kg N uptake), and (C.) N harvest index (NHI) of contrasting N-efficient maize hybrids (H) at Harare high-N and Harare low-N. Results are means of 2003 and 2004. Broken lines represent mean values for each trait.