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Ajanga, S.

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Ajanga
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Ajanga, S.

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    Maize variety options for Africa: Kenya
    (CIMMYT, 2015) Abate, T.; Regasa, M.W.; Makumbi, D.; Wawa, B.; Ajanga, S.
    Maize is by far the largest contributor of food security in Kenya. Maize productivity growth has been slow owing to recurrent drought; the advent of MLN (Maize Lethal Necrosis) has increased the challenges of maize production in Kenya.
    Publication
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    Participatory farmer evaluation of stem borer tolerant maize varieties in three maize growing ecologies of Kenya
    (Academic Journals, 2011) Ouma, J.O.; Odendo, M.; Bett, C.; De Groote, H.; Mugo, S.N.; Mutinda, C.J.M.; Gethi, J.; Njoka, S.; Ajanga, S.; Shuma, J.M.
    Insect resistant maize for Africa (IRMA) project aims at developing and deploying insect resistant maize varieties to reduce grain losses due to insect pests. As part of incorporating farmers? perceptions to improve the adoption of the developed varieties, participatory approaches were adopted. The paper analyses farmer?s preferences of maize germplasm developed through conventional breeding. This paper uses data collected from evaluations conducted at the end of 2006 April and October rains season. Nine stem borer resistant maize varieties were evaluated alongside six commercial checks in the moist transitional zones (East and West) at taselling and harvest stage, while in the dry transitional zone and dry mid altitude zones, six new varieties were evaluated together with four commercial checks at harvest stage. Each variety was assessed on a scale of 1(very poor) to 5 (very good) based on key criteria generated in earlier group discussions with farmers and overall score. Data was analyzed using ordinal regression model of Social Package for Social Sciences (SPSS). At the Dry Transitional (DT) zone, CKIR06007 and CKIR06008 were more preferred to the checks based on overall score. CKIR06008 was also more preferred on yield and tolerance to insect pest criteria, while CKIR04002, CKIR06009, and CKIR04003 were perceived more superior to local check based on tolerance to insect pests. In the DM altitude zone, CKIR06008 was better on yield attribute. Three varieties namely CKIR04002, CKIR06007, CKIR06009 were superior on stem borer tolerance attribute. In moist transitional zone Embu only CKIR06005 was more preferred (p<0.01) to the check at harvest stage in April 2006 and October rains season based on early maturity. While there was no preference for the new varieties at vegetative stage in Embu in October rains 2006 season, a number of new varieties CKIR06001, CKIR06002, CKIR06003, CKIR06004, and CKIR06005 were more preferred based on early maturity at harvest in October rains 2006 season. In the moist transitional zone (west) CKIR06004 had good attributes in terms of cob size at taselling stage in April rains 2006. We conclude that farmers perceive some varieties to have good tolerance to insect pests in addition to good yield and early maturity, which are critical attributes to the farmers in the adoption of new varieties.
    Publication
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    Genotype by environment interactions and yield stability of stem borer resistant maize hybrids in Kenya
    (Academic Journals, 2011) Beyene, Y.; Mugo, S.N.; Mutinda, C.J.M.; Tadele Tefera; Karaya, H.; Ajanga, S.; Shuma, J.M.; Tende, R.; Kega, V.
    In a maize breeding program, potential genotypes are usually evaluated in different environments before desirable ones are selected. Genotype x environment (G x E) interaction is associated with the differential performance of genotypes tested at different locations and in different years, and influences selection and recommendation of cultivars. Twenty one stem borer resistance maize hybrids and four commercial checks were evaluated in six environments in Kenya under infestation with Chilo partellus and Busseola fusca to determine the G x E interactions and stability of the hybrids. Analysis of variance was conducted for grain yield, days to flowering and plant and ear height. Stability for grain yield was determined using genotype plus genotype by environment interaction (GGE) biplot analysis. Variances due to genotype, environment and G x E interaction effects were highly significant for all traits. The GGE biplot showed that four experimental hybrids and two commercial checks had positive PC1 score indicating above average performance across environments. However, 10 experimental hybrids and two commercial checks had negative PC1 score, suggesting poor average performance. Experimental hybrids, CKIR07004 and CKIR07013, were highly desirable in terms of grain yield (>7.5 t/ha) and stability across environments. These hybrids could be released in Kenya and similar environments.
    Publication