IITA Bibliography System: Recent submissions

Now showing items 601-620 of 8125

    • Feed the Future: Nigeria Integrated Agriculture Activity - 17th edition 

      USAID; IITA (United States Agency for International Development, 2022-10)

    • Beyond average: are the yield and income impacts of adopting drought-tolerant maize varieties heterogeneous? 

      Kamara, A.Y.; Oyinbo, O.; Manda, J.; Kamara, A.; Idowu, E.O.; Mbavai, J.J. (2023-02-23)
      Assessing the benefits of adopting climate-resilient farming technologies without considering the heterogeneity among farmers, may not provide a sufficient evidence base for policy. Yet, most empirical studies do not go beyond documenting the average effects of climate-resilient technologies. Using farm household survey data from Nigeria, this paper examines whether and to what extent the yield and income impacts of adopting drought-tolerant maize varieties are heterogeneous. We used the ...

    • Assessing the conservation status of wild banana genetic resources by means of population genetics and distribution modelling 

      Mertens, A. (Katholieke Universiteit Leuven, 2023-01)
      Crop wild relatives (CWR) are wild plant species that are closely related or ancestral to cultivated plants. Because they often have high allelic diversity compared to their associated crop, they are an important source for the improvement of multiple agronomic traits such as yield or the resistance against biotic or abiotic stresses. Loss of genetic diversity due to increasing anthropogenic pressure now threatens their long term survival. There is a growing recognition of the importance of CWR ...

    • Establishing the linkage between Eba’s instrumental and sensory descriptive profiles and their correlation with consumer preferences: implications for cassava breeding 

      Alamu, E.O.; Teeken, B.; Ayetigbo, O.; Adesokan, M.; Kayondo, S.I.; Chijioke, U.; Madu, T.; Okoye, B.; Bello, A.A.; Njoku, D.; Rabbi, I.Y.; Egesi, C.; Ndjouenkeu, R.; Bouniol, A.; de Sousa, K.; Dufour, D.; Maziya-Dixon, B. (2023-02-22)
      Background Gari and Eba (cassava semolina) is mainly consumed in Nigeria and other West African countries. Defining the food product profile (biophysical, sensory, and textural qualities) that drives its acceptability, and integrating the component traits into breeding programs, are critical for the better adoption of new genotypes. This study aimed to define the Gari and Eba critical quality traits, define medium and high throughput instrumental methods for use by breeders, measure their respective ...

    • Assessment of structure and governance of amenity trees in the premises of International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria 

      Owoeye, Y.T. (University of Ibadan, 2021-10)
      Amenity trees are components of the urban forest which contribute significantly to human wellbeing and improves environmental quality. Benefits derivable from amenity trees are numerous but inadequate or lack of knowledge of the structure of the urban treescape as well as poor or no management practices like institutional framework has limited these benefits. A number of institutions has lot of trees planted within their premises. However, more often than not, those trees have become hazardous and ...

    • Effect of shade on ecophysiology of cocoa under stress conditions 

      Mensah, E.O. (University of Ghana, 2021-09)
      Climate models predict increasing air temperature and decreasing rainfall patterns among cocoa growing regions around the world. Both heat and drought stress are known to affect physiology of cocoa plants through reduced rates of photosynthesis, lack of water and generally impaired physiological processes. This in turn leads to decreased yields and in severe cases, increased risks of mortality. Many studies have reported positive effects of shade on cocoa production; however, interest of full sun ...

    • Effectiveness of the Yangambi biosphere reserve in reducing deforestation in the Democratic Republic of the Congo 

      Kipute, D.D.; Mate, J.P.; Kankeu, R.S.; Ngouhouo-Poufoun, J.; Kahindo, J.M.; Mampeta, S.; Lelo, U.; Sonwa, D.; Joiris, D.V.; Demaze, M.T. (2023-01)
      Establishing protected areas creates an opportunity to reduce deforestation. This study aims to inform the Congolese government’s efforts to promote forest and biodiversity conservation by assessing the effectiveness of the Yangambi Biosphere Reserve (YBR) in reducing deforestation. Group and individual interviews designed to understand the causes of pressure on forest cover in the Yangambi landscape complemented satellite imagery analyses. The results indicate that deforestation inside the YBR ...

    • Genetic diversity of virome and mycobiome of cassava in Bagamoyo, Tanzania and basis for treat discrepancy between cassava brown streak virus species 

      Mero, H.R. (University of Dar es Salaam, 2022-10)
      Brown streak is the most destructive viral disease of cassava causing up to 100% yield loss whilst fungal diseases contribute up to 90% cassava yield loss in Sub Saharan Africa. Genetic diversity of novel virus and fungal species infecting cassava in Bagamoyo, Tanzania is not fully comprehended. For unclear reasons, it is difficulty to breed resistance for one causal pathogen of cassava brown streak disease (CBSD), Cassava Brown Streak Virus (CBSV) compared to another, Ugandan Cassava Brown Streak ...

    • Motivational pathways for farmer learning behaviour in the student‐to‐farmer university outreach 

      Kalule, S.W.; Sseguya, H.; Karubanga, G.; Ongeng, D. (2023-02-23)
      In recent times, calls for practical training of agricultural extension workers, who exhibit the right mix of competences for responsiveness to farmer learning needs, have intensified. This comes at the time when there is an increasingly growing desire for more community‐engaged African universities, and as such, making the integration of agricultural students into community outreach services a necessity. However, empirical evidence on whether student‐led outreach and training models adequately ...

    • Factoring labour when comparing in situ rainwater harvesting technologies for semi-arid areas of central Tanzania 

      Swai, E.; Mwinuka, L.; Shitindi, M.J.; Manda, J.; Whitbread, A.; Bekunda, M. (2023-02-08)
      Erratic rainfall, high evapotranspiration rates and droughts are major factors limiting crop production in semi-arid areas. Tied ridges that have crossed ties within the furrow are among the physical soil and water conservation measures. During the 2018/19 and 2019/20 seasons, we examined the efficacy of repaired tied ridges for maize crop (Zea mays) and sorghum (Sorghum bicolor) in Kongwa district of Tanzania as an alternate labour saving strategy for managing climate risks associated with variable ...

    • Resistance screening of white yam (Dioscorea rotundata Poir.) accessions against Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 using yam vines 

      Adomako, J.; Otoo, E.; Danso, Y.; Alhassan, D.K.; Adebola, P.; Asfaw, A. (2022-04)
      Root-knot nematode (Meloidogyne incognita) is an economically important phytoparasitic nematode species. In yam production, therefore, breeding for nematode resistance is an important environmentally friendly tool to manage root-knot nematodes damage. The aim of this study was to determine the reaction of 18 yam accessions to M. incognita inoculation under screen house conditions using single node vine cuttings. Vines of each accession were planted in sterilized soil and inoculated with 1000 ...

    • Inheritance of resistance to Fusarium verticillioides ear rot in maize inbred lines of southern, west and central Africa origin 

      Tembo, E.; Minnaar‐Ontong, A.; Menkir, A.; Marais, G.; Magorokosho, C.; Labuschagne, M.T. (2022-10)
      Maize (Zea mays L.) is an important crop in sub-Sahara Africa for both human consumption and livestock feed. Maize use is often limited by ear-rotting fungi, some of which produce deleterious secondary metabolites. The aim of this study was to determine the inheritance of resistance to Fusarium verticillioides as an indirect way of selecting for resistance to secondary metabolites such as the mycotoxin fumonisin that is produced by this fungus, under artificial inoculation and natural infection. ...

    • Combining ability of selected soybean [Glycine max (L.) Merrill] parental lines 

      Otusanya, G.O.; Chigeza, G.; Chander, S.; Abebe, A.T.; Sobowale, O.O.; Ojo, D.K.; Akoroda, M. (2022-02)
      Background: The success of hybridization programme depends on the combining ability of parental lines. Methods: Seven soybean genotypes and all their partial diallel crosses in the F2 generation were evaluated in a randomized complete block design at two locations in Nigeria, during the 2017-2018 growing season. Result: Analysis of variance showed that both environments and genotypes were significantly different for all measured traits. The genotype TGx 1988-5F was the best general combiner for ...

    • A genome-wide scan divulges key Loci involved in resistance to aphids (Aphis craccivora) in cowpea (Vigna unguiculata) 

      Ongom, P.O.; Togola, A.; Fatokun, C.; Boukar, O. (2022-11-01)
      Cowpea aphids (Aphis craccivora Koch) double as a direct damaging pest and a virus vector to cowpea, threatening the economic yield of the crop. Given the multiple ecotypes, different alleles have been implicated in aphid resistance, necessitating the identification of key genes involved. The present study implemented a genome-wide scan using 365 cowpea mini-core accessions to decipher loci involved in resistance to aphid ecotype from Kano, Nigeria. Accessions were artificially inoculated with A. ...

    • Early detection of plant virus infection using multispectral imaging and spatial-spectral machine learning 

      Peng, Y.; Dallas, M.M.; Ascencio‑Ibanez, J.T.; Hoyer, J.S.; Legg, J.; Hanley‑Bowdoin, L.; Grieve, B.; Yin, H. (2022-02-24)
      Cassava brown streak disease (CBSD) is an emerging viral disease that can greatly reduce cassava productivity, while causing only mild aerial symptoms that develop late in infection. Early detection of CBSD enables better crop management and intervention. Current techniques require laboratory equipment and are labour intensive and often inaccurate. We have developed a handheld active multispectral imaging (A-MSI) device combined with machine learning for early detection of CBSD in real-time. The ...

    • Assessing nitrogen flows and greenhouse gas emissions in low input cropping systems of Lake Victoria Basin 

      Winnie, N. (Kenyatta University, 2022-10)
      Too little nitrogen (N) is a threat to cropping systems and soil fertility in sub-Saharan Africa (SSA). Nitrogen budgets (NB) and nitrogen use efficiency (NUE) are critical tools for assessing N dynamics in agriculture and have received little or no attention in the region. The study aimed to assess key N performance indicators at field and farm level based on N use scenarios and help to inform policy on formulating relevant decision and practices to enhance N management for improved crop productivity ...

    • Effects of potassium and magnesium on cassava vegetative and root yield 

      Sanginga, A.D. (University of Eldoret, 2022-10)
      Cassava (Manihot esculentum) has a high potassium (K) demand and its application does not generally increase yields. Potassium may have antagonistic effects on magnesium (Mg) leading to deficiency of Mg in the soil. The objectives of this study were to (I) evaluate the vegetative growth of cassava under different K and Mg fertilizer combinations and (ii) determine the effects of K and Mg fertilizer on cassava storage root yield. A 2-cropping season experiment was conducted in a randomized complete ...

    • Assessing the potential of the ECMWF-S5 satellite-based seasonal rainfall forecasts for improved crop farming in Ghana 

      Kwabena, O. (Kwame Nkrumah University of Science and Technology, 2022-09)
      Forecasts of seasonal rainfall are important for the agricultural sector, particularly in nations where rain-fed agriculture is predominant. A robust agricultural system is made possible by the ability to predict seasonal rainfall with accuracy and precision. Due to the limited and sparse availability of gauge data, both satellite-based and model seasonal rainfall forecasts are beneficial for predicting seasonal rainfall. While seasonal rainfall forecasts based on models and satellites complement ...

    • Strengthening cowpea seed systems to increase the productivity of smallholder farmers in west Africa 

      Omoigui, L.O.; Kamara, A.; Iorlamen, T.; Muhammed, I.; Ojiewo, C.O. (IInternational Institute of Tropical Agriculture, 2023)

    • The potential of valuation 

      Termansen, M.; Jacobs, S.; Dendoncker, N.; Ghazi, H.; Gundimeda, H.; Huambachano, N.; Lee, H.; Mukherjee, N.; Nemoga, G.R.; Ngouhouo-Poufoun, J.; Palomo, I.; Pandit, N.R.; Schaafsma, M.; Choi, A.; Filyushkina, A.; Hernandez-Blanco, M.; Contreras, V.; Gonzalez-Jimenez, D. (IPBES, 2022-10)