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Two improved tropical maize composites, TZL COMP3 and TZL COMP4; representing complementary heterotic pools have been subjected to four cycles of reciprocal recurrent selection (RRS) for two decades to enhance varietal cross performance. The objectives of this study were to evaluate the effect of...


Kolawole, A.O.Menkir, A.Blay, E.Ofori, K.Kling, J.G.[Changes in heterosis of maize (Zea mays L.) varietal cross hybrids after four cycles of reciprocal recurrent selection]Changes in heterosis of maize (Zea mays L.) varietal cross hybrids after four cycles of reciprocal recurrent selection

The physical quality characteristics of test weight, 1000-kernel weight, percent floaters, Stenvert Hardness Index, kernel size (dimensions), water absorption index of grain and starch and chemical properties (protein, fat, ash, crude fiber, total sugars, starch, amylose, and amylopectin) were de...


Okoruwa, A.E.Kling, J.G.Maziya-Dixon, B.B.[Physical, chemical and water absorption properties of improved, openpollinated maize cultivars]Physical, chemical and water absorption properties of improved, openpollinated maize cultivars

The development of hybrids with enhanced expression of heterosis depends on the genetic background of the source population and the effectiveness of a breeding scheme used to identify and use divergent inbred lines with good combining ability. The present study was conducted to examine the potent...


Menkir, A.Kling, J.G.Anjorin, B.Ladejobi, F.Gedil, M.[Evaluating testcross performance and genetic divergence of lines derived from reciprocal tropical maize composites]Evaluating testcross performance and genetic divergence of lines derived from reciprocal tropical maize composites

Eighteen S1 lines of maize (Zea mays L.) derived from a low nitrogen tolerant pool and two inbred lines were evaluated for agronomic performance under moderate N conditions in the southern Guinea savannah of Nigeria. Generally, the breeding lines differed in yield, growth, vertical rootpulling re...


Kamara, A.Y.Kling, J.G.Menkir, A.Ibikunle, O.[Agronomic performance of maize (Zea mays L.) breeding lines derived from a low nitrogen maize population]Agronomic performance of maize (Zea mays L.) breeding lines derived from a low nitrogen maize population

Maize simulation models are proposed as tools for assessment of response to nitrogen (N) fertilizer and varieties in order to explore potential target zones for improved maize varieties. The CERES-maize model in the Decision Support System for Agrotechnology Transfer version 2.1 was tested using ...


Jagtap, S.S.Abamu, F.J.Kling, J.G.[Longterm assessment of nitrogen and variety technologies on attainable maize yields in Nigeria using CERESmaize]Longterm assessment of nitrogen and variety technologies on attainable maize yields in Nigeria using CERESmaize

Maize is the most important cereal in sub-Saharan Africa. It is relatively inexpensive and provides many families with much-needed nutrients. For the farmers, it matures early and Is a source of ready income. Maize production Is being threatened by some diseases and pests, among which are downy m...


Kling, J.G.Cardwell, K.F.Bosque Pérez, N.A.Kim, S.K.[Advances in screening methods and breeding for resistance to downy mildew and stem borers in maize]Advances in screening methods and breeding for resistance to downy mildew and stem borers in maize

The lepidopterous stem borers Sesamia calamistis Hampson (Noctuidae) and Eldana saccharina (Walker) (Pyralidae) are among the most important insect pests of maize in West Africa. Efforts to breed for resistance to these two borer species are an integral part of a project to develop control practi...


Bosque Pérez, N.A.Kling, J.G.Odubiyi, S.I.[Recent advances in the development of sources of resistance to pink stalk borer and African sugarcane borer]Recent advances in the development of sources of resistance to pink stalk borer and African sugarcane borer

Two field experiments were conducted during the 1993 and 1994 growing seasons at Samaru (7° 38' E; 11° 11' N), northern Nigeria, to evaluate N-use efficiency (kg grain per kg available soil N) and yield of 5 maize genotypes planted early in the season under five levels of N. The hybrid (8644-27) ...


Oikeh, S.O.Kling, J.G.Horst, Walter J.Chude, V.O.[Yield and Nuse efficiency of five tropical maize genotypes under different N levels in the moist savanna of Nigeria]Yield and Nuse efficiency of five tropical maize genotypes under different N levels in the moist savanna of Nigeria

Striga represents the largest biological threat to cereal production in sub-Saharan Africa. Breeding for resistance to Striga has been the focal point of IITA to reduce the impact of this parasite on maize production. The early breeding work at IITA focused on search for tolerance to Striga. IITA...


Menkir, A.Kling, J.G.Badu-Apraku, B.The, C.Ibikunle, O.[Recent advances in breeding maize for resistance to Striga hermonthica (Del.) Benth]Recent advances in breeding maize for resistance to Striga hermonthica (Del.) Benth

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