Journal and Journal Articles: Recent submissions

Now showing items 1101-1120 of 5271

    • Detection of non-additive gene action within elite maize populations evaluated in contrasting environments under rainforest ecology in Nigeria 

      Akinwale, R.O.; Eze, C.E.; Traore, D.; Menkir, A. (2021)
      Proper understanding of the mode of gene action in open-pollinated varieties (OPVs) maize parents helps breeder in the choice of appropriate breeding method to improve its genetic value. The objectives of the present study were to determine gene action controlling grain yield and other agronomic traits of late maturing elite OPVs and classify the varieties into heterotic groups. Ninety-one hybrids generated from 14 elite OPV parents using diallel mating design were evaluated with their parents ...

    • Factors influencing implementation of bylaws on sustainable crop intensification: evidence from potatoes in southwestern Uganda 

      Makuma-Henry, M.; Kibwika, P.; Nampala, P.; Manyong, V.; Yami, M. (2020)
      The study examined the factors for the successful implementation of bylaws on sustainable crop intensification. The study used the new institutionalism theory to examine the implementation of bylaws in the potato cropping system in southwestern Uganda. A mixed model featuring both qualitative and quantitative approaches was used in the study. This involved analysis of primary data. The primary sources were key informants, focus group discussions, and face to face interviews with individual farmers, ...

    • From cassava to gari: mapping of quality characteristics and end-user preferences in Cameroon and Nigeria 

      Ndjouenkeu, R.; Kegah, F.N.; Teeken, B.; Okoye, B.C.; Madu, T.; Olaosebikan, O.; Chijioke, U.; Bello, A.A.; Osunbade, A.O.; Owoade, D.; Takam-Tchuente, N.H.; Njeufa, E.B.; Chomdom, I.L.N.; Forsythe, L.; Maziya-Dixon, B.; Fliedel, G. (2021)
      User’s preferences of cassava and cassava products along the value chain are supported by specific root quality characteristics that can be linked to root traits. Therefore, providing an evidence base of user preferred characteristics along the value chain can help in the functional choice of cassava varieties. In this respect, the present paper presents the results from focus group discussions and individual interviews on user preferred quality characteristics of raw cassava roots and the derived ...

    • Cocoa marketing chain in developing countries: how do formal-informal linkages ensure its sustainability in Cameroon? 

      Nkouedjo, L.L.; Mathe, S.; Fon, D.E.; Geitzenauer, M.; Manga, A.A. (2020-12)
      Although liberalization of the cocoa sector has increased internal competition within the marketing chain it has also led to the emergence of informal market actors within the chain. Therefore, the aim of this paper is to analyse how the cocoa marketing chain operates by measuring and comparing the marketing margins of the formal and informal actors. Qualitative data were used to establish the structure of the marketing chain and quantitative data to estimate the marketing margins. A total sampling ...

    • Evaluating animal-based foods and plant-based alternatives using multi-criteria and SWOT analyses 

      Blanco-Gutiérrez, I.; Varela-Ortega, C.; Manners, R. (2020)
      Global diets have transitioned in recent decades with animal and processed products increasing. Promoting a reversal in these trends towards plant-based diets could reduce the environmental impacts of food systems and reduce the prevalence of non-communicable diseases and malnutrition. In Spain, a reference point for the Mediterranean diet (predominantly plant-source based), plant-based alternatives to traditional animal-based products are receiving increased attention. However, limited focus has ...

    • Understanding cassava varietal preferences through pairwise ranking of gari-eba and fufu prepared by local farmer-processors 

      Teeken, B.; Agbona, A.; Bello, A.A.; Olaosebikan, O.; Alamu, E.O.; Adesokan, M.; Awoyale, W.; Madu, T.; Okoye, B.; Chijioke, U.; Owoade, D.; Okoro, M.; Bouniol, A.; Dufour, D.; Hershey, C.; Rabbi, I.Y.; Maziya-Dixon, B.; Egesi, C.; Tufan, H.A.; Kulakow, P. (2021)
      Within communities in Osun and Imo States of Nigeria, farmer–processors grew and processed a diverse set of improved and landrace cassava varieties into the locally popular foods, gari, eba and fufu. Local and 15 main varieties were grown in a ‘mother and baby trials’ design in each state. Mother trials with three replications were processed by farmer–processors renown in their community for their processing skills. Baby trials were managed and processed by other farmer–processors. The objective ...

    • Comparing the functional and pasting properties of gari and the sensory attributes of the eba produced using backslopped and spontaneous fermentation methods 

      Awoyale, W.; Oyedele, H.; Adenitan, A.A.; Alamu, E.O.; Maziya-Dixon, B. (2021)
      The possibilities of backslopped fermentation replacing spontaneous fermentation in gari production were evaluated by comparing the functional and pasting properties of gari and the sensory attributes of the eba. Backslopped cassava mash (BCM) was produced from 75 kg of TMS13F1343 cassava roots by pre-fermenting for 96 h. The BCM was mixed with fresh cassava mash (FCM) from another 75 kg of the same variety using design expert software developed blend ratios and processed to backslopped fermented ...

    • Leaf traits variation of arabica coffee cultivars in response to population density and mineral nutrient 

      Tamirat, W.; Gobena, A.; Kufa Obso, T. (2020-12-30)
      Leaf trait is good predictors of plant performance. It is closely associated with light requirement, growth and survival of the plant. This study was designed to evaluate the effect of seedling planting density and fertilizer rate on leaf traits variation of two Arabica coffee cultivars under nursery conditions. It was conducted at Jimma Agricultural Research Center from (February 29 to October 29), 2018. A factorial experiment was used and treatments were arranged using completely randomized ...

    • Low soil nutrient tolerance and mineral fertilizer response in White Guinea Yam (Dioscorea rotundata) genotypes 

      Matsumoto, R.; Ishikawa, H.; Asfaw, A.; Asiedu, R. (2021)
      Yam (Dioscorea spp.) is a major food security crop for millions of resource-poor farmers, particularly in West Africa. Soil mineral deficiency is the main challenge in yam production, especially with the dwindling of fallow lands for the indigenous nutrient supply. Cultivars tolerant to available low soil nutrients and responsive to added nutrient supply are viable components of an integrated soil fertility management strategy for sustainable and productive yam farming systems in West Africa. This ...

    • Gender roles in sourcing and sharing of banana planting material in communities with and without banana bunchy top disease in Nigeria 

      Nkengla-Asi, L.; Eforuoku, F.; Olaosebikan, O.; Ladigbolu, T.A.; Amah, D.; Hanna, R.; Kumar, P.L. (2021)
      Banana bunchy top disease (BBTD) is the most devastating disease of banana and plantain (Musa spp.). The disease spreads through the use of infected vegetative propagules and the banana aphid (Pentalonia nigronervosa) is the virus vector. This study seeks to understand the gender dimensions and sociocultural aspects of banana seed (vegetative propagule) sourcing and sharing practices among men and women farmers, and its influence on BBTD spread and disease control efforts. Data were collected from ...

    • Genetic parameter estimation and selection in advanced breeding population of white Guinea yam 

      Norman, P.E.; Tongoona, P.B.; Danquah, A.; Danquah, E.Y.; Agre, P.A.; Agbona, A.; Asiedu, R.; Asfaw, A. (2021)
      White Guinea yam (Dioscorea rotundata Poir.) is an important tuber crop grown extensively in tropical regions of West African yam belt. Tuber yield, dry matter content, and tolerance to yam mosaic virus are key traits used for identification and selection of superior varieties for commercial deployment. In this study, we estimated genetic parameters for fresh tuber yield, tuber dry matter content, and quantitative field tolerance to yam mosaic virus in 49 clones grown in multi-environment trials ...

    • Auxin signaling and vascular cambium formation enables storage metabolism in cassava tuberous roots 

      Rüscher, D.; García, J.M.C.; Carluccio, A.V.; Klemens, P.A.; Gisel, A.; Stavolone, L.; Neuhaus, H.E.; Ludewig, F.; Sonnewald, U.; Zierer, W. (2021)
      Cassava storage roots are among the most important root crops worldwide and represent one of the most consumed staple foods in Sub-Saharan Africa. The vegetatively propagated tropical shrub can form many starchy tuberous roots from its stem. These storage roots are formed through the activation of secondary root growth processes. However, the underlying genetic regulation of storage root development is largely unknown. Here we report on distinct structural and transcriptional changes occurring ...

    • Potato cyst nematodes Globodera rostochiensis and G. pallida 

      Price, J.A.; Coyne, D.; Blok, V.C.; Jones, J.T. (2021-05)
      Taxonomy Phylum Nematoda; class Chromadorea; order Rhabditida; suborder Tylenchina; infraorder Tylenchomorpha; superfamily Tylenchoidea; family Heteroderidae; subfamily Heteroderinae; Genus Globodera. Biology Potato cyst nematodes (PCN) are biotrophic, sedentary endoparasitic nematodes. Invasive (second) stage juveniles (J2) hatch from eggs in response to the presence of host root exudates and subsequently locate and invade the host. The nematodes induce the formation of a large, multinucleate ...

    • Evaluation of improved cassava genotypes for yield and related traits for a better breeding strategy under different agroecologies in Nigeria 

      Adetoro, N.A.; Oworu, O.O.; Nassir, A.L.; Bello, A.; Parkes, E.; Ogunbayo, S.A.; Akinwale, M.G.; Aina, O.O.; Afolabi, A.; Iluebbey, P.; Sanni, L.O.; Maziya-Dixon, B.; Dixon, A.; Kulakow, P. (2021)
      This study aimed at determining shoot and root characteristics of cassava as affected by root yield and the influence of soil moisture on vegetative growth and yield. Thirty cassava genotypes were evaluated for morphological and physiological characterization in three locations in Nigeria: Ibadan, Mokwa and Zaria. Randomized complete block design was used with four replicates. Studies on the pasting properties of the genotypes were also carried out. Data were collected on plant height, stem girth, ...

    • Diversite des trajectoires de l'agriculture biologique au Cameroun 

      Bayiha, G.D.L.; Temple, L.; Mathe, S. (2020)
      Dans un contexte de renouvellement des enjeux technologiques de l'agriculture africaine, l'agriculture biologique représente une option de transition potentielle. Cette étude analyse les conditions de son développement au Cameroun. Elle mobilise le modèle multi-niveaux de la théorie des transitions sociotechniques. Elle est documentée par des enquêtes réalisées entre 2016 et 2018. Les résultats soulignent le rôle central des institutions dans l'activation des trajectoires de l'agriculture biologique. ...

    • Optimizing sowing density-based management decisions with different nitrogen rates on smallholder maize farms in northern Nigeria 

      Adnan, A.A.; Diels, J.; Jibrin, J.M.; Kamara, A.; Shaibu, A.S.; Garba, I.I.; Craufurd, P.; Maertens, M. (2021-01-18)
      In this study, the CERES-Maize model was calibrated and evaluated using data from 60 farmers’ fields across Sudan (SS) and Northern Guinea (NGS) Savannas of Nigeria in 2016 and 2017 rainy seasons. The trials consisted of 10 maize varieties sown at three different sowing densities (2.6, 5.3, and 6.6 plants m−2) across farmers’ field with contrasting agronomic and nutrient management histories. Model predictions in both years and locations were close to observed data for both calibration and evaluation ...

    • Disease incidence and severity in cowpea lines evaluated for resistance to single and multiple infections of endemic viruses in Nigeria 

      Ogunsola, K.E.; Ilori, C.; Fatokun, C.A.; Boukar, O.; Ogunsanya, P.; Kumar, P.L. (2020-10)
      Cowpea (Vigna unguiculata (L.) Walp) is susceptible to several viruses in West Africa. Cowpea viral diseases are mainly controlled through the use of resistant cultivars. Co-infection with more than one virus is frequent in the fields and the resultant synergistic effect often compromises host resistance identified by screening against individual viruses under field or controlled conditions. In this study, eight improved cowpea breeding lines, identified as resistant to single infections and a ...

    • Maize–legume strip cropping effect on productivity, income, and income risk of farmers in northern Ghana 

      Rahman, N.A.; Larbi, A.; Kotu, B.; Asante, M.O.; Akakpo, D.B.; Bedi, S.M.; Hoeschle‐Zeledon, I. (2021)
      Maize (Zea mays L.)–legume intercropping is common cropping system among smallholder farmers in West Africa. However, little is known about the income risk reduction associated with maize–legume strip cropping in West Africa. A 3‐yr study was conducted in Upper West and Northern regions of Ghana to determine the effect of maize–legume strip cropping on productivity, income, and income risk using a randomized complete block design with five replications in each region. Seven treatments were used: ...

    • Genetic diversity of white yam (Dioscorea rotundata Poir) accessions maintained in tissue culture and cultivated in field using Simple Sequence Repeat (SSR) Markers and Morphological Characterization 

      Gabriel, A.; Agre, P.; Edemode, A.; Okon, A.E.; Bhattacgarjee, R.; De Koyer, D. (2021)
      Dioscorea rotundata is a staple food crop for millions of people in the tropical and subtropical regions. In vitro germplasm conservation is a very useful tool in yam improvement strategies but very little is known about the genetic integrity and stability of in-vitro conserved yam plants. In this study, 42 accessions from in vitro and field populations were genotyped using 11 microsatellite markers and 23 morphological descriptors to assess variability within and between accessions. Out of the ...

    • Data set of smallholder farm households in banana-coffee-based farming systems containing data on farm households, agricultural production and use of organic farm waste 

      Reetsch, A.; Schwärzel, K.; Kapp, G.; Dornack, C.; Masisi, J.; Alichard, L.; Robert, H.; Byamungu, G.; Rocha, J.L.; Stephene, S.; Baijukya, F.; Feger, K.H. (2021-04)
      The data was collected in the Karagwe and Kyerwa districts of the Kagera region in north-west Tanzania. It encompasses 150 smallholder farming households, which were interviewed on the composition of their household, agricultural production and use of organic farm waste. The data covers the two previous rainy seasons and the associated vegetation periods between September 2016 and August 2017. The knowledge of experts from the following institutions was included in the discussion on the selection ...