Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Genetic Interaction Studies Reveal Superior Performance of Rhizobium tropici CIAT899 on a Range of Diverse East African Common Bean (Phaseolus vulgaris L.) Genotypes
    Gunnabo, A.H. ; Geurts, R. ; Wolde-Meskel, E. ; Degefu, T. ; Giller, K.E. ; Heerwaarden, J. van - \ 2019
    Applied and Environmental Microbiology 85 (2019)24. - ISSN 0099-2240
    bean genotypes - genotype-by-strain interaction - N2 fixation - nodulation - Rhizobium strains

    We studied symbiotic performance of factorial combinations of diverse rhizobial genotypes (GR) and East African common bean varieties (GL) that comprise Andean and Mesoamerican genetic groups. An initial wide screening in modified Leonard jars (LJ) was followed by evaluation of a subset of strains and genotypes in pots (contained the same, sterile medium) in which fixed nitrogen was also quantified. An additive main effect and multiplicative interaction (AMMI) model was used to identify the contribution of individual strains and plant genotypes to the GL × GR interaction. Strong and highly significant GL × GR interaction was found in the LJ experiment but with little evidence of a relation to genetic background or growth habits. The interaction was much weaker in the pot experiment, with all bean genotypes and Rhizobium strains having relatively stable performance. We found that R. etli strain CFN42 and R. tropici strains CIAT899 and NAK91 were effective across bean genotypes but with the latter showing evidence of positive interaction with two specific bean genotypes. This suggests that selection of bean varieties based on their response to inoculation is possible. On the other hand, we show that symbiotic performance is not predicted by any a priori grouping, limiting the scope for more general recommendations. The fact that the strength and pattern of GL × GR depended on growing conditions provides an important cautionary message for future studies.IMPORTANCE The existence of genotype-by-strain (GL × GR) interaction has implications for the expected stability of performance of legume inoculants and could represent both challenges and opportunities for improvement of nitrogen fixation. We find that significant genotype-by-strain interaction exists in common bean (Phaseolus vulgaris L.) but that the strength and direction of this interaction depends on the growing environment used to evaluate biomass. Strong genotype and strain main effects, combined with a lack of predictable patterns in GL × GR, suggests that at best individual bean genotypes and strains can be selected for superior additive performance. The observation that the screening environment may affect experimental outcome of GL × GR means that identified patterns should be corroborated under more realistic conditions.

    Policy recommendations for the legume sector in Ethiopia
    Bodnar, F. ; Wolde-Meskel, E. ; Giller, K.E. - \ 2019
    Wageningen : N2Africa (N2Africa project report 123) - 12 p.
    Annual report, Key milestones, objectives, progress, biological nitrogen fixation, grain legumes, Nigeria, Borno State, Ghana, Tanzania, Ethiopia, Uganda, DR Congo, Rwanda, Kenya, Malawi, Zimbabwe, Mozambique
    N2Africa Annual Report 2019
    Dontsop-Nguezet, Paul M. ; Ampadu-Boakye, Theresa ; Ronner, E. ; Baars, Edward ; Kanampiu, Fred ; Giller, K.E. ; Vanlauwe, B. ; Adjei-nsiah, Samuel ; Wolde-Meskel, E. ; Ebanyat, Peter ; Baijukya, Frederick ; Dianda, M. ; Sanginga, Jean-Marie ; Woomer, P.L. ; Chikowo, Regis ; Phiphira, Lloyd ; Kantengwa, Speciose ; Leonardo, W. ; Kamai, Nkeki ; Thuijsman, E.C. ; Schilt-van Ettekoven, C. - \ 2019
    Wageningen : N2Africa (N2Africa project report 120) - 78 p.
    Annual report, Key milestones, objectives, progress, biological nitrogen fixation, grain legumes, Nigeria, Borno State, Ghana, Tanzania, Ethiopia, Uganda, DR Congo, Rwanda, Kenya, Malawi, Zimbabwe, Mozambique
    Responses to inoculation of Phaseolus beans on N2Africa trials in Ethiopia, Tanzania, Rwanda and Zimbabwe
    Thuijsman, E.C. ; Ronner, E. ; Wolde-Meskel, E. ; Kantengwa, Speciose ; Rurangwa, E. ; Chikowo, Regis ; Chekanai, Vongai ; Baijukya, Frederick ; Giller, K.E. - \ 2019
    Wageningen : N2Africa (N2Africa project report 118) - 12 p.
    Annual report - Key milestones - objectives - progress - biological nitrogen fixation - grain legumes - Nigeria - Borno State - Ghana - Tanzania - Ethiopia - Uganda - DR Congo - Rwanda - Kenya - Malawi - Zimbabwe - Mozambique
    Studies on responses to inoculation in bush bean(Phaseolus vulgaris) were carried out as part of the N2Africa project (www.n2africa.org) in Ethiopia, Tanzania, Rwanda and Zimbabwe.Inoculant treatments without fertilizer inputs significantly improved yields by 0.27 t ha-1compared to the unamended control in Ethiopia. The combined effect of inoculation and P fertilization was much larger and significant in all four countries. Trials in Tanzania and in Zimbabwe also included the application of N fertilizer, and manure was included on the trials in Rwanda. Largest yields were achieved when inoculant and fertilizer inputs were combined. Inoculation tended to boost responses to fertilizer inputs in Ethiopia, Rwanda and Tanzania. Detailed results per country are given below.
    N2Africa Podcaster no. 56 : Putting nitrogen fixation to work for smallholder farmers in Africa: April, May and June 2019
    Schilt-van Ettekoven, C. ; Giller, K.E. ; Ronner, E. ; Abdulkadir, Birhan ; Wolde-Meskel, Endalkachew ; Adjei-Nsiah, S. ; Kamai, Nkeki ; Baijukya, F.P. ; Ebanyat, Peter ; Ninsiima, P. ; Tamiru, Amanuel - \ 2019
    Wageningen : N2Africa project (N2Africa Podcaster 56) - 12 p.
    N2Africa Annual Report 2018
    Ampadu-Boakye, Theresa ; Ronner, E. ; Kanampiu, Fred ; Giller, K.E. ; Baars, Edward ; Vanlauwe, B. ; Adjei-nsiah, Samuel ; Wolde-Meskel, E. ; Ebanyat, Peter ; Baijukya, Frederick ; Sanginga, Jean-Marie ; Woomer, P.L. ; Chikowo, Regis ; Phiphira, Lloyd ; Kantengwa, Speciose ; Leonardo, W. ; Kamai, Nkeki ; Thuijsman, E.C. ; Schilt-van Ettekoven, C. - \ 2019
    Wageningen : N2Africa (N2Africa project report 111) - 77 p.
    Annual report, Key milestones, objectives, progress, biological nitrogen fixation, grain legumes, Nigeria, Borno State, Ghana, Tanzania, Ethiopia, Uganda, DR Congo, Rwanda, Kenya, Malawi, Zimbabwe, Mozambique
    High-Resolution Mapping of Nitrogen Dioxide With TROPOMI : First Results and Validation Over the Canadian Oil Sands
    Griffin, Debora ; Zhao, Xiaoyi ; McLinden, Chris A. ; Boersma, Folkert ; Bourassa, Adam ; Dammers, Enrico ; Degenstein, Doug ; Eskes, Henk ; Fehr, Lukas ; Fioletov, Vitali ; Hayden, Katherine ; Kharol, Shailesh K. ; Li, Shao Meng ; Makar, Paul ; Martin, Randall V. ; Mihele, Cristian ; Mittermeier, Richard L. ; Krotkov, Nickolay ; Sneep, Maarten ; Lamsal, Lok N. ; Linden, Mark ter; Geffen, Jos van; Veefkind, Pepijn ; Wolde, Mengistu - \ 2019
    Geophysical Research Letters 46 (2019)2. - ISSN 0094-8276 - p. 1049 - 1060.
    nitrogen dioxide - OMI - TROPOMI

    TROPOspheric Monitoring Instrument (TROPOMI), on-board the Sentinel-5 Precurser satellite, is a nadir-viewing spectrometer measuring reflected sunlight in the ultraviolet, visible, near-infrared, and shortwave infrared. From these spectra several important air quality and climate-related atmospheric constituents are retrieved, including nitrogen dioxide (NO2) at unprecedented spatial resolution from a satellite platform. We present the first retrievals of TROPOMI NO2 over the Canadian Oil Sands, contrasting them with observations from the Ozone Monitoring Instrument satellite instrument, and demonstrate TROPOMI's ability to resolve individual plumes and highlight its potential for deriving emissions from individual mining facilities. Further, the first TROPOMI NO2 validation is presented, consisting of aircraft and surface in situ NO2 observations, and ground-based remote-sensing measurements between March and May 2018. Our comparisons show that the TROPOMI NO2 vertical column densities are highly correlated with the aircraft and surface in situ NO2 observations, and the ground-based remote-sensing measurements with a low bias (15–30 %); this bias can be reduced by improved air mass factors.

    From best fit technologies to best fit scaling: incorporating and evaluating factors affecting the adoption of grain legumes in Sub-Saharan Africa
    Farrow, Andrew ; Ronner, Esther ; Brand, Greta J. van den; Boahen, Stephen K. ; Leonardo, Wilson ; Wolde-Meskel, Endalkachew ; Adjei-Nsiah, Samuel ; Chikowo, Regis ; Baijukya, Fredrick ; Ebanyat, Peter ; Sangodele, Emmanuel A. ; Sanginga, Jean-Marie ; Kantengwa, Speciose ; Phiphira, Lloyd ; Woomer, Paul ; Ampadu-Boakye, Theresa ; Baars, Edward ; Kanampiu, Fred ; Vanlauwe, Bernard ; Giller, Kenneth E. - \ 2019
    Experimental Agriculture 55 (2019)S1. - ISSN 0014-4797 - p. 226 - 251.
    The success of scaling out depends on a clear understanding of the factors that affect adoption of grain legumes and account for the dynamism of those factors across heterogeneous contexts of sub-Saharan Africa. We reviewed literature on adoption of grain legumes and other technologies in sub-Saharan Africa and other developing countries. Our review enabled us to define broad factors affecting different components of the scaling out programme of N2Africa and the scales at which those factors were important. We identified three strategies for managing those factors in the N2Africa scaling out programme: (i) testing different technologies and practices; (ii) evaluating the performance of different technologies in different contexts; and (iii) monitoring factors that are difficult to predict. We incorporated the review lessons in a design to appropriately target and evaluate technologies in multiple contexts across scales from that of the farm to whole countries. Our implementation of this design has only been partially successful because of competing reasons for selecting activity sites. Nevertheless, we observe that grain legume species have been successfully targeted for multiple biophysical environments across sub-Saharan Africa, and to social and economic contexts within countries. Rhizobium inoculant and legume specific fertiliser blends have also been targeted to specific contexts, although not in all countries. Relatively fewer input and output marketing models have been tested due to public–private partnerships, which are a key mechanism for dissemination in the N2Africa project.
    Additive yield response of chickpea (Cicer arietinum L.) to rhizobium inoculation and phosphorus fertilizer across smallholder farms in Ethiopia
    Wolde-meskel, Endalkachew ; Heerwaarden, Joost van; Abdulkadir, Birhan ; Kassa, Sofia ; Aliyi, Ibsa ; Degefu, Tulu ; Wakweya, Kissi ; Kanampiu, Fred ; Giller, Ken E. - \ 2018
    Agriculture, Ecosystems and Environment 261 (2018). - ISSN 0167-8809 - p. 144 - 152.
    Grain legume - Mesorhizobium - Nitrogen fixation - Yield gaps - Yield variability
    The impacts of rhizobium inoculation on growth and yield of chickpea have mainly been tested in experiments conducted in greenhouses or on research stations. We report the response of the crop to inoculation (I) and phosphorus fertilizer (P) application across a large number of smallholder's farms over four regions of Ethiopia, covering diverse soil fertility and agro-ecological conditions. Increased grain yields due to the soil fertility treatments was evident for 99% target farmers. On average, I and P increased grain yield by 21% and 25% respectively, while the combined application of I and P resulted in a 38% increase. However, observed grain yields on control plots and responses to the treatments on individual farms varied greatly, and relative yield responses (%; yield of P and/I minus control yield, divided by control yield) ranged from 3% to 138%. With the exception of a few extremely poorly yielding locations, average responses to P and I were high across a wide range of control yields, indicating the possibility of boosting chickpea productivity for smallholders with P fertilizer and inoculant technology. Variation in response to rhizobium inoculation was mostly independent of agro-ecology and soil type although it was found to be low on a number of farms with extremely high N contents (%). Assuming that a relative yield increase of 10% due to treatment effects is required to be visible, 71%, 73% and 92% of the farmers observed a yield benefit by applying P, I, and P + I, respectively. The results are discussed with respect to the additive benefits of P fertilizers and rhizobial inoculation and their implications for wide scale promotion of inoculant technology to smallholders.
    Prospect for increasing grain legume crop production in East Africa
    Loon, Marloes P. van; Deng, Nanyan ; Grassini, Patricio ; Rattalino Edreira, Juan I. ; Wolde-meskel, Endalkachew ; Baijukya, Frederick ; Marrou, Hélène ; Ittersum, Martin K. van - \ 2018
    European Journal of Agronomy 101 (2018). - ISSN 1161-0301 - p. 140 - 148.
    Chickpea - Common bean - Cowpea - Food self-sufficiency - Groundnut - Legumes - Pigeonpea - Sub-Saharan Africa - Yield gap - Yield potential

    Agricultural production in East Africa (E-Afr) has to increase drastically to meet future food demand. Yield gap assessment provides important information on the degree to which production can be increased on existing cropland. Most research on yield gap analysis has focussed on cereal crops, while legumes have received less attention despite of their relatively large area, and their importance as source of protein in smallholder farming systems in E-Afr. The objectives of this study were to (i) estimate water-limited yield potential (Yw) and yield gaps (Yg) for major grain legume crops in E-Afr, and (ii) estimate how narrowing the current legume Yg can contribute to food self-sufficiency by the year 2050. We focussed on Ethiopia, Kenya, and Tanzania, and five legumes crops including chickpea, common bean, cowpea, groundnut, and pigeonpea. A bottom-up approach which entails that local weather, soil and agronomic data was used as input for crop modelling (SSM-legumes) in a spatial framework, to estimate Yw, actual on-farm yield (Ya), and Yg from local to regional scale. Future legume self-sufficiency was assessed for 2050 demand assuming different Yg closure scenarios. On average, Ya was 25% of Yw across all legume-county combinations, being 15% for Kenya, 23% for Tanzania and 41% for Ethiopia. On average, common bean had the largest Yg of 2.6 Mg ha−1and chickpea the smallest (1.4 Mg ha−1). Closure of the exploitable Yg (i.e., 80% of Yw) can help to meet future legume demand in both Kenya and Tanzania, while it seems not to be sufficient in Ethiopia.

    Soyabean response to rhizobium inoculation across sub-Saharan Africa : Patterns of variation and the role of promiscuity
    Heerwaarden, Joost van; Baijukya, Frederick ; Kyei-Boahen, Stephen ; Adjei-nsiah, Samuel ; Ebanyat, Peter ; Kamai, Nkeki ; Wolde-Meskel, Endalkachew ; Kanampiu, Fred ; Vanlauwe, Bernard ; Giller, Ken - \ 2018
    Agriculture, Ecosystems and Environment 261 (2018). - ISSN 0167-8809 - p. 211 - 218.
    Bradyrhizobium - Promiscuous varieties - Response variability - Smallholder farmers - Soyabean - Sub saharan Africa - Sustainable intensification
    Improving bacterial nitrogen fixation in grain legumes is central to sustainable intensification of agriculture in sub-Saharan Africa. In the case of soyabean, two main approaches have been pursued: first, promiscuous varieties were developed to form effective symbiosis with locally abundant nitrogen fixing bacteria. Second, inoculation with elite bacterial strains is being promoted. Analyses of the success of these approaches in tropical smallholder systems are scarce. It is unclear how current promiscuous and non-promiscuous soyabean varieties perform in inoculated and uninoculated fields, and the extent of variation in inoculation response across regions and environmental conditions remains to be determined.We present an analysis of on-farm yields and inoculation responses across ten countries in Sub Saharan Africa, including both promiscuous and non-promiscuous varieties. By combining data from a core set of replicated on-farm trials with that from a large number of farmer-managed try-outs, we study the potential for inoculation to increase yields in both variety types and evaluate the magnitude and variability of response.Average yields were estimated to be 1343 and 1227. kg/ha with and without inoculation respectively. Inoculation response varied widely between trials and locations, with no clear spatial patterns at larger scales and without evidence that this variation could be explained by yield constraints or environmental conditions. On average, specific varieties had similar uninoculated yields, while responding more strongly to inoculation. Side-by side comparisons revealed that stronger responses were observed at sites where promiscuous varieties had superior uninoculated yields, suggesting the availability of compatible, effective bacteria as a yield limiting factor and as a determinant of the magnitude of inoculation response.
    Review of policies relating to legume intensification in N2Africa countries
    Stadler, Minke ; Giller, K.E. ; Kanampiu, Fred ; Sangodele, Emmanuel A. ; Ebanyat, Peter ; Wolde-Meskel, Endalkachew ; Baijukya, Frederick ; Adjei-Nsiah, S. ; Sanginga, Jean-Marie ; Kantengwa, Speciose ; Woomer, P.L. ; Chikowo, Regis ; Phiphira, Lloyd ; Leonardo, W. ; Kamai, Nkeki ; Schilt-van Ettekoven, C. - \ 2017
    N2Africa project (N2Africa project report 107) - 38 p.
    The ‘N2Africa Review of policies relating to legume intensification in N2Africa counties’ showed that governments in N2Africa countries acknowledge the importance of legume intensification and its significant potential to contribute to improving food security and health, especially for poor families.
    At global level, the seventeen Sustainable Development Goals (SDGs) of the 2030 Agenda for Sustainable Development developed by the United Nations (UN) aim to end all forms of poverty, fight inequalities and tackle climate change, while ensuring that no one is left behind. The SDGs recognize that ending poverty must go hand-in-hand with strategies that build economic growth and addresses a range of social needs including education, health and job opportunities, amongst others. Governments are expected to take ownership and establish national frameworks for the achievement of the seventeen goals. Particularly, SDG2 ‘End hunger achieve food security and improved nutrition and promote sustainable agriculture’ seeks sustainable solutions to end hunger in all its forms and to achieve food security. It entails improving the productivity and incomes of small-scale farmers by promoting equal access to land, technology and markets, sustainable food production systems and resilient agricultural practices.
    The Comprehensive Africa Agriculture Development Programme (CAADP) is the pan-African policy framework for agricultural transformation, wealth creation, food security and nutrition, economic growth and prosperity for all. The CAADP Results Framework 2015 – 2025 is prepared by the Food and Agriculture Organisation (FAO) of the UN in cooperation with the New Partnership for Africa’s Development (NEPAD) Steering Committee. It recognizes the importance of increasing yield of food grains, tubers and legumes to catalyse transformation of Africa’s agricultural systems and presents critical actions required to achieve agricultural development agenda targets. Furthermore, the Association for Strengthening Agricultural Research in Eastern and Central Africa (ASARECA) serves as a platform for promoting regional research and in the sharing of benefits and spillovers that derive from such research. The association focuses on four thematic areas that are well aligned to the major ongoing regional and continental initiatives. These include (i) Integrated capacity strengthening, (ii) Development and scaling up of technologies and innovations, (iii) Policy advocacy, market analysis and institutional arrangement, (iv) Knowledge and information management. High yielding climbing bean varieties and training on different staking options are included in ASARECA projects that scale up best practices to address farmers’ needs.
    National governments in the N2Africa countries all developed national policies aimed at increasing agricultural productivity, improving food security, diversifying food production to improve nutrition, and increasing agricultural incomes of the rural people. All national policies refer to legumes, mostly indirectly (e.g. intercropping practices, as measure for soil fertility, amongst others). Table 1 presents the N2Africa target legumes mentioned in national policies per N2Africa country.

    All national policies aim at increasing the production and productivity of various legumes by various strategies, such as (i) adopting modern production techniques, (ii) strengthening coordination, institutional capacity and skills across the key actors, (iii) providing timely and appropriate market entry support for effective market development and (iv) scaling up production and trade, amongst others. Rhizobia are only referred to in a few national policies (e.g. Ethiopia, Kenya, Malawi and Rwanda). The Tanzanian government is the only government that developed an explicit policy tool to promote the pulses sector (e.g. common bean, cowpea, pigeonpea, green gram and chickpea, mung bean and Bambara nut).
    The study results will be completed and used to provide recommendations to governments about best-fit legume technologies, how to increase production and productivity of various legumes and how to stimulate farmers’ use.
    Tailoring and adaptation in N2Africa demonstration trials : intermediate report
    Thuijsman, Eva ; Ronner, E. ; Heerwaarden, J. van - \ 2017
    Wageningen : N2Africa (Project report N2Africa 99) - 28
    One of N2Africa's objectives is to "tailor and adapt legume technologies to close yield gaps and expand the area of legume production within the farm" (Objective 4). Sub-objectives are to develop variety * inoculant * nutrient management recommendations for the target legumes and areas (Objective 4.1), and to develop best-fit recommendations (Objective 5.5). Each season, in diagnostic and demonstration trials, the effectiveness of varieties, inputs and management practices has been assessed, leading to the development of such recommendations. In other words: technologies were tailored and adapted to make them more suitable for specific legumes, areas or groups of farmers. To report on these objectives, we would like to capture the "learning pathways" that have led to changes in the design of demonstration trials and the development of best-fit recommendations.

    This report provides an overview of changes that have occurred on trials in terms of variety selection, input choice and other practices. These changes and their reasons and initiators are listed in tables per crop for five core countries: Ghana, Nigeria, Ethiopia, Tanzania and Uganda. The report only comprises the changes that have occurred, not the full overview of technologies that are being tested and demonstrated by N2Africa.

    Information about the learning pathways were collected via an ODK survey with country coordinators and field research officers Samuel Adjei-Nsiah and Arnold Sylvester Amppiah (Ghana), Endalkachew Wolde-Meskel and Birhan Abdulkadir (Ethiopia), Bassey Ukem (Nigeria), Abubakar Mohammed (Nigeria), Sheu Muhammad Dandago (Nigeria), Abubakari Mzanda (Tanzania) and Anthony Epel (Uganda). They described the changes that had occurred in demonstration trials since the beginning of N2Africa Phase II in 2014, and the stakeholders who initiated the actions.
    Sustainable intensification of grain legumes with smallholders in Africa through nitrogen fixation : highlights from the N2Africa project
    Wolde-Meskel, Endalkachew ; Heerwaarden, J. van; Abdulkadir, Birhan ; Giller, K.E. - \ 2017
    Improving Nitrogen Fixation in grain legumes is central to the sustainable intensification of agriculture in sub-Saharan Africa (SSA) and inoculation with effective rhizobia can make an important contribution to this goal. Genetic and phenotypic studies have identified large taxonomic diversity and differences in symbiotic effectiveness between isolates from SSA soils, suggesting that there is potential for developing more effective inoculants from native bacteria. The N2Africa project has pursued two approaches in this regard: First, identification of elite strains from native rhizobial collections with the aim of developing inoculants for local production in SSA and second, promotion of inoculation with effective bacterial strains at scale. Here, we report the genetic and symbiotic diversity of indigenous isolates, success with the search for elite strains and achievements of the project in getting the inoculant technology out to farmers at a larger scale through Private Public Partnership (PPP). Response of crops to inoculation across a large number of smallholder’s farms, covering diverse soil fertility and agro-ecological conditions, was evident. Commonly, increased grain yield of >10% over yield on control plots (a yield level assumed to be visible to farmers) was realized for most farmers. However, observed grain yields on control plots and responses to inoculation on individual farms varied greatly with a relative yield responses ranging from 3% - 100%. The additive benefits and possibilities for a wide scale promotion of inoculant technology to smallholders through a PPP approach will be discussed.
    On-Farm Yield Response of Chickpea [Cicer Arietinum (L)] to Inoculation and Phosphorus Fertilizer in Ethiopia
    Wolde-Meskel, E. ; Kanampiu, F.K. ; Heerwaarden, J. van; Abdulkadir, Birhan ; Descheemaeker, K.K.E. ; Aliyi, Ibsa ; Giller, K.E. - \ 2016
    - p. 17 - 17.
    Screening for New Rhizobium Strains for Studying Legume Genotype x Strain Interaction in Chickpea and Common Bean in Ethiopia
    Gunnabo, A.H. ; Giller, K.E. ; Wolde-Meskel, E. ; Geurts, R. ; Heerwaarden, J. van; Degefu, T. - \ 2016
    - p. 35 - 35.
    Opportunities for Sustainable Legume Business Development: An Experience from the Public-Private Partnership Progresses in South Eastern Ethiopia
    Amanu, Tamiru ; Baars, E. ; Wolde-Meskel, E. ; Abdulkadir, Birhan ; Ampadu-Boakye, Theresa ; Giller, K.E. ; Kanampiu, F.K. - \ 2016
    - p. 49 - 49.
    Mining for gold: large scale data management and analysis of on-farm legume trials : N2Africa - Putting nitrogen fixation to work for smallholder farmers in Africa
    Heerwaarden, J. van; Lubbers, M.T.M.H. ; Adjei-Nsiah, S. ; Bayukija, F. ; Ebanyat, P. ; Kamai, Nkeki ; Sangodele, E. ; Wolde-Meskel, E. ; Abdulkadir, Birhan ; Amppiah, Arnold ; Epel, A. ; Mzandah, A. ; Muhammad, S. ; Ukem, B. ; Onyinge, J. ; Othieno, A. ; Sekham, J. ; Ampadu-Boakye, Theresa ; Franke, L. - \ 2016
    N2Africa Action Areas in Ethiopia, Ghana, Nigeria, Tanzania and Uganda in the N2Africa Project
    Farrow, Andrew ; Wolde-Meskel, Endalkachew ; Adjei-Nsiah, S. ; Sangodele, E. ; Kamara, A. ; Kamai, Nkeki ; Baijukya, F. ; Ebanyat, Peter - \ 2015
    N2Africa project - 23 p.
    Microscopische gasveer levert kracht in cellen
    Janson, M.E. ; Lansky, Z. ; Wolde, P.R. Ten - \ 2015
    Nederlands Tijdschrift voor Natuurkunde 81 (2015)7. - ISSN 0926-4264 - p. 244 - 247.
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