Boahen, S.    

Firstname:S. 
Surname:Boahen 
Email:s.boahen@cgiar.org 
Institute:IITA 
Homepage:http://www.iita.org 

67 publications (0 read)

3 Keywords relate to this author

Cowpea
Socioeconomic studies
Sub-Saharan Africa




Publications as Author



2025

Climate-smart cropping arrangement and integrated soil fertility technologies for maize and cowpea to enhance soil health, yield, and income in Malawi, Omondi, J. O., Simwaka, P.*, Kamwana, F.*, Siyeni, D.*, Alene, A., Gbegbelegbe, S., Kadwala, P., Msukwa, W., Boahen, S., Chinwada, P. and Akinwale, M. G., 2025.
 
Tracking the storage root bulking of cassava under split application of fertilizer nutrients, Omondi, J. O., doRosario, N., Manda, N., Ntawuruhunga, P., Parkes, E., Mushoriwa, H ., Mbuthia, L. W.* and Boahen, S., in: Frontiers in Agronomy, volume 7, number -: 1573919, pages 1-12, ISSN 2673-3218, 2025. [DOI]
 
Characterizing the soils of Eastern Zambia, Omondi, J. O., Mwila, M.*, Banda, A.*, Boahen, S. and Chikoye, D., 2025.
 

2024

Strategic Foresight analysis of droughts in southern Africa and implications for food security, Gbegbelegbe, S., Chikoye, D., Alene, A., Boahen, S. and Chigeza, G., in: Frontiers in Sustainable Food Systems, volume 7, number -: 1159901, pages 1-23, ISSN 2571-581X, 2024. [DOI]
 

2023

Closing the yield gap of soybean (Glycine max (L.) Merril) in southern Africa: a case of Malawi, Zambia, and Mozambique, Omondi, J. O., Mkuhlani, S., Mugo, J., Chibeba, A. M., Chiduwa, M. S., Chigeza, G., Boahen, S., Masikati, P. and Nyagumbo, I., in: Frontiers in Agronomy, volume 5, number -: 1219490, pages 1-14, ISSN 2673-3218, 2023. [DOI]
 
Symbiotic effectiveness of Bradyrhizobium strains on soybean growth and productivity in Northern Mozambique, Boahen, S., Engoke, C., Muananamuale, C., Malita, C., Wiredu, A., Chibeba, A. M., Elia, P. and Chikoye, D., in: Frontiers in Sustainable Food Systems, volume 6, number -: 1084745, pages 1-15, ISSN 2571-581X, 2023. [DOI]
 

2022

Prospects and potential of Bradyrhizobium diazoefficiens based bio-inoculants on soybean production in different agro-ecologies of Mozambique, Engoke, C., Wiredu, A., Chikoye, D. and Boahen, S., in: Frontiers in Sustainable Food Systems, volume 6, number : 908231, pages 1-16, ISSN 2571-581X, 2022. [DOI]
 
Inoculant formulation and application determine nitrogen availability and water use efficiency in soybean production, Engoke, C., Chikoye, D. and Boahen, S., pages 1-24, ISBN 978-1-80355-699-4, 2022. [DOI]
 

2021

Inoculant, nitrogen and phosphorus improves photosynthesis and water-use efficiency in soybean production, Engoke, C., Wiredu, A., Omondi, J. O. and Boahen, S., in: Journal of Agricultural Science, pages 1-14, ISSN 0021-8596, 2021. [DOI]
 

2020

Genome-wide association analyses reveal the genetic basis of biomass accumulation under symbiotic nitrogen fixation in African soybean, Torkamaneh, D., Chalifour, F. P., Beauchamp, C. J., Agrama, H., Boahen, S., Maaroufi, H., Rajcan, I. and Belzile, F., in: Theoretical and Applied Genetics, volume 133, pages 665-676, ISSN 0040-5752, 2020. [DOI]
 
Optimizing root yield of cassava under fertigation and the masked effect of atmospheric temperature, Omondi, J. O ., Yermiyahu, U., Rachmilevitch, S., Boahen, S., Ntawuruhunga, P., Sokolowski, E. and Lazarovitch, N., in: Journal of the Science of Food and Agriculture, volume 100, number 12, pages 4592-4600, ISSN 0022-5142, 2020. [DOI]
 
Towards sustainable yield improvement: field inoculation of soybean with Bradyrhizobium and co-inoculation with Azospirillum in Mozambique, Chibeba, A. M., Boahen, S., de Fatima Guimaraes, M.*, Nogueira, M. A.* and Hungria, M.*, in: Archives of Microbiology, volume 2020, pages 2579-2590, ISSN 0302-8933, 2020. [DOI]
 
Potential of inoculant and phosphorus application on soybean production in Mozambique, Engoke, C. and Boahen, S., in: Universal Journal of Agricultural Research, volume 8, number 2, pages 46-57, ISSN 2332-2268, 2020. [DOI]
 

2019

Genome of the African cassava whitefly Bemisia tabaci and distribution and genetic diversity of cassava-colonizing whiteflies in Africa, Chen, W., Wosula, E. N., Hasegawa, D. K., Casinga, C. M., Shirima, R. R., Fiaboe, K., Hanna, R., Fotso Kuate, A., Goergen, G ., Tamo, M., Mahuku, G., Murithi, H., Tripathi, L., Mware, B., Kumar, P. L., Ntawuruhunga, P., Moyo, C., Yomeni, M. O., Boahen, S., Edet, M., Awoyale, W., Wintermantel, W. M., Ling, K., Legg, J. and Fei, Z., in: Insect Biochemistry and Molecular Biology, volume 110, pages 112-120, ISSN 0965-1748, 2019. [DOI]
 
Draft genome sequence of Agrobacterium deltaense strain CNPSo 3391, isolated from a soybean nodule in Mozambique, Scherer, A. J.*, Delamuta, J. R. M.*, Ribeiro, R. A.*, Chibeba, A. M., Boahen, S., Nogueira, M. A.* and Hungria, M.*, in: Microbiology Resource Announcements, volume 8, number 10, pages 1-2, ISSN 2576-098X, 2019. [DOI]
 
Public sector soybean (Glycine max) breeding: advances in cultivar development in the African tropics, Chigeza, G., Boahen, S., Gedil, M., Agoyi, E. E.*, Mushoriwa, H.*, Denwar, N. N.*, Gondwe, T., Tesfaye, A.*, Kamara, A., Alamu, E. O. and Chikoye, D., in: Plant Breeding, pages 1-10, ISSN 0179-9541, 2019. [DOI]
 

2018

Assessing host range, symbiotic effectiveness, and photosynthetic rates induced by native soybean rhizobia isolated from Mozambican and south African soils, Gyogluu, C.*, Mohammed, M.*, Jaiswal, S. K.*, Boahen, S. and Dakora, F. D.*, in: Symbiosis, volume 75, pages 257-266, ISSN 0334-5114, 2018. [DOI]
 
Nutrient use efficiency and harvest index of cassava decline as fertigation solution concentration increases, Omondi, J. O ., Lazarovitch, N., Rachmilevitch, S., Boahen, S., Ntawuruhunga, P., Sokolowski, E. and Yermiyahu, U., in: Journal of Plant Nutrition and Soil Science, pages 1-11, ISSN 1436-8730, 2018. [DOI]
 
Soyabean response to rhizobium inoculation across sub-Saharan Africa: patterns of variation and the role of promiscuity, van Heerwaarden, J., Baijukya, F., Boahen, S., Adjei-Nsiah, S., Ebanyat, P., Kamai, N., Wolde-Meskel, E., Kanampiu, F., Vanlauwe, B. and Giller, K., in: Agriculture, Ecosystems and Environment, volume 261, pages 211-218, ISSN 0167-8809, 2018. [DOI]
 
Identification and distribution of microsymbionts associated with soybean nodulation in Mozambican soils, Gyogluu, C.*, Jaiswal, S. K.*, Boahen, S. and Dakora, F. D.*, in: Systematic and Applied Microbiology, pages 1-10, ISSN 0723-2020, 2018. [DOI]
 

2017

Isolation, characterization and selection of indigenous Bradyrhizobium strains with outstanding symbiotic performance to increase soybean yields in Mozambique, Chibeba, A. M., Boahen, S., de Fatima Guimaraes, M.*, Nogueira, M. A.* and Hungria, M.*, in: Agriculture, Ecosystems and Environment, volume 246, pages 291-305, ISSN 0167-8809, 2017. [DOI]
 
Feasibility of transference of inoculation-related technologies: a case study of evaluation of soybean rhizobial strains under the agro-climatic conditions of Brazil and Mozambique, Chibeba, A. M., Boahen, S., de Fatima Guimaraes, M.*, Nogueira, M. A.* and Hungria, M.*, in: Agriculture, Ecosystems and Environment, pages 1-11, ISSN 0167-8809, 2017. [DOI]
 
Growth and yield responses of cowpea to inoculation and phosphorus fertilization in different environments, Boahen, S., Engoke, C., Chikoye, D. and Abaidoo, R., in: Frontiers in Plant Science, volume 8, number 646, pages 1-13, ISSN 1664-462X, 2017. [DOI]
 

2016

Legumes for economic empowerment and social inclusion of women: the case of a health and nutrition project implemented in southern Africa: proceeding (poster), Gondwe, T., Tegbaru, A., FitzSimons, J., Maziya-Dixon, B., Alamu, E. O., Boahen, S. and Chigeza, G., Pan African Grain Legumes and World Cowpea, 2016.
 
Fertigation maximizes growth and root tuber yield of cassava: proceeding (poster), Okoth, J., Lazarovitch, N., Rachmilevitch, S., Yermiyahu, U., Boahen, S., Ntawuruhunga, P. and Sokolowski, E., World Congress on Root and Tuber Crops (WCRTC), 2016.
 
From best fit technologies to best fit scaling: incorporating and evaluating factors affecting the adoption of grain legumes in Sub-Saharan Africa., Farrow, A., Ronner, E., van den Brand, G ., Boahen, S., Leonardo, W., Wolde-Meskel, E., Adjei-Nsiah, S., Chikowo, R.*, Baijukya, F., Ebanyat, P., Sangodele, E., Sanginga, J. M., Kantengwa, S ., Phiphira, L., Woomer, P. L., Ampadu-Boakye, T., Baars, E., Kanampiu, F., Vanlauwe, B. and Giller, K., in: Experimental Agriculture, pages 1-26, ISSN 0014-4797, 2016. [DOI]
 
Effects of plant density on the performance of cowpea in Nigerian Savannas, Kamara, A., Tofa, A., Boahen, S., Solomon, R., Ajeigbe, H. A.+ and Kamai, N., in: Experimental Agriculture, pages 1-13, ISSN 0014-4797, 2016. [DOI]
 
Response of promiscuous-nodulating soybean (Glycine max L. Merr.) genotypes to Bradyrhizobium inoculation at three field sites in Mozambique, Gyogluu, C.*, Boahen, S. and Dakora, F. D.*, in: Symbiosis, pages 1-8, ISSN 0334-5114, 2016. [DOI]
 

2015

Cowpea, Boukar, O., Fatokun, C., Roberts, P. A., Abberton, M., Huynh, B., Close, T. J., Boahen, S., Higgins, T. J. V. and Ehlers, J. D., Handbook of Plant Breeding, volume 10, pages 219-250, chapter 7, Springer, ISBN 978-1-4939-2796-8, 2015. [DOI]
 

2014

Agronomic Response of Soybean Varieties to Plant Population in the Guinea Savannas of Nigeria, Kamara, A., Ewansiha, S. U.*, Boahen, S. and Tofa, A., in: Agronomy Journal, volume 106, number 3, pages 1051-1059, ISSN 0002-1962, 2014. [DOI]
 
Growth and yield responses of two soybean cultivars to Inoculation, P and N fertilization in Northern Mozambique, Boahen, S., Chikoye, D., Abaidoo, R., Muananamuale, C. and Engoke, C., 2014.
 
Growth and yield responses of two soybean cultivars to Inoculation, P and N fertilization in Northern Mozambique, Boahen, S., Chikoye, D., Abaidoo, R., Muananamuale, C. and Engoke, C., Abstract (Poster), presentation at the ASA, CSSA, & SSSA International Annual Meeting held Nov. 2-5, at Long Beach, 2014.
 

2013

Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Malawi, Alene, A., Khonje, M., Mwalughali, J., Chafuwa, C., Longwe, A., Khataza, R., Kapalasa, E., Madzorera, I., Gondwe, T., Mussagy, M., Ntawuruhunga, P., Boahen, S., Maziya-Dixon, B. and Chikoye, D., International Institute of Tropical Agriculture, ISBN 978-978-8444-30-5, 2013.
 
Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Mozambique, Alene, A., Khonje, M., Mwalughali, J., Chafuwa, C., Longwe, A., Khataza, R., Kapalasa, E., Madzorera, I., Gondwe, T., Mussagy, M., Ntawuruhunga, P., Boahen, S., Maziya-Dixon, B. and Chikoye, D., International Institute of Tropical Agriculture, ISBN 978-978-8444-29-9, 2013.
 
Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Swaziland, Alene, A., Khonje, M., Mwalughali, J., Chafuwa, C., Longwe, A., Khataza, R., Kapalasa, E., Madzorera, I., Gondwe, T., Mussagy, M., Ntawuruhunga, P., Boahen, S., Maziya-Dixon, B. and Chikoye, D., International Institute of Tropical Agriculture, ISBN 978-978-8444-31-2, 2013.
 
Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Zambia, Alene, A., Khonje, M., Mwalughali, J., Chafuwa, C., Longwe, A., Khataza, R., Kapalasa, E., Madzorera, I., Gondwe, T., Mussagy, M., Ntawuruhunga, P., Boahen, S., Maziya-Dixon, B. and Chikoye, D., International Institute of Tropical Agriculture, ISBN 978-978-8444-32-9, 2013.
 
N2Africa: putting nitrogen fixation to work for smallholder farmers in Africa, Giller, K., Franke, A., Abaidoo, R., Baijukya, F., Bala, A.*, Boahen, S., Dashiell, K., Kantengwa, S., Sanginga, J. M., Sanginga, N., Simmons, A., Turner, A., De Wolf, J., Woomer, P. L. and Vanlauwe, B., pages 156-174, chapter 12, Routledge, ISBN 978-0-415-53273-0, 2013.
 
Value chain analyses of grain legumes in N2Africa: Kenya, Rwanda, eastern DRC, Ghana, Nigeria, Mozambique, Malawi and Zimbabwe, Rusike, J., van den Brand, G ., Boahen, S., Dashiell, K., Kantengwa, S., Ongoma, J.*, Mongane, D., Kasongo, K.*, Jamagani, Z.*, Aidoo, R.* and Abaidoo, R., 2013.
 
Supply and demand drivers of the sustainable intensification of farming systems through grain legumes in Central, Eastern and Southern Africa, Rusike, J., Boahen, S., Dashiell, K., Kantengwa, S., Ongoma, J.*, Mongane, D. and Kasongo, G., pages 1-10, chapter 15, Routledge, ISBN 978-0415532730, 2013.
 
Reproductive phenology and yield responses of soybean genotypes with varying maturity duration to planting date, Boahen, S., Chikoye, D., Tefera, H. and Abaidoo, R., Abstract presented at ASA-CSSA-SSSA 2013 International Annual Meeting, November 3 - 6, 2013, Tampa, Florida, 2013.
 
Growth and yield of determinate and indeterminate soybeans in Mozambique, Boahen, S., Chikoye, D., Tefera, H. and Abaidoo, R., Abstract in book of Abstracts, World Soybean Research Conference, Durban South Africa, Feb 17-22,, 2013.
 

2012

Targeting cowpea breeding and seed delivery efforts to enhance poverty impacts in sub-Saharan Africa, Coulibaly, O., Alene, A., Abdoulaye, T., Chianu, J., Manyong, V., Aitchedji, C., Fatokun, C., Kamara, A., Boukar, O., Tefera, H., Boahen, S. and Chikoye, D., in: Innovative research along the cowpea value chain:proceedings of the Fifth World Cowpea Conference on improving livelihoods in science, held in Saly, Senegal, 27 september -1 October 2010, pages 358-368, IITA, Ibadan, Nigeria, 2012.
 
A success tale on improving two legume crops in Africa, Boukar, O., Abdoulaye, T., Tamo, M., Agrama, H., Tefera, H., Fatokun, C. and Boahen, S., in: R4D Review, number 8, pages 11-15, ISSN 2071-3681, 2012.
 
Distribution and potential impact of cassava variety spread by UPoCA, Okechukwu, R., James, B., Ntawuruhunga, P., Mahungu, N., Boahen, S., Kanju, E. and Osei-Sarfoh, A., in: Tropical Roots and Tuber Crops and the Challenges of Globalization and Climate Changes. Proceedings of the 11th triennial Symposium of the ISTRC-AB, 4 to 8 October 2010, pages 325-331, ISTRC-AB, Ibadan, Nigeria, 2012.
 
Evaluation of plant growth and grain yield of 30 cowpea genotypes in Mozambique, Ussene, R., Muananamuale, C. and Boahen, S., Abstract, p. 110-111 in Conference Information, Program and Abstracts of Integrated Soil Fertility Management Conference (ISFM), Oct 22-26, 2012, Safari Park Hotel, Nairobi, Kenya, 2012.
 
Evaluation of plant growth and grain yield of 30 cowpea (Vigna unguiculata (L.) Walp, genotypes grown in Mozambique, Ussene, R., Muananamuale, C., Boahen, S., Chikoye, D. and Dakora, F. D.*, CIAT, 2012.
 
Evaluation of cowpea genotypes for adaptation to agro-ecologies of Mozambique, Boahen, S., Chikoye, D., Kamara, A. and Boukar, O., Abstract: ASA-CSSA-SSSA international annual meetings, Oct. 21-24, 2012, Cincinnati, Ohio, 2012.
 

2011

First report of soybean witches'-broom disease caused by Group 16SrII phytoplasma in soybean in Malawi and Mozambique, Kumar, P. L., Sharma, K., Boahen, S., Tefera, H. and Tamo, M., in: Plant Disease, volume 95, number 4, pages 492-495, ISSN 0191-2917, 2011. [DOI]
 
Evaluation of cowpea lines for adaptation to agro-ecologies of Mozambique., Ussene, R., Muananamuale, C., Boahen, S., Chikoye, D. and Dakora, F. D.*, Abstract (Poster), p. 254 in the Proceedings of the 10th African Crop Science Society Conference,"from soil to soul- crop production for improved African livelihoods and better environment for future generations", held in Maputo, Mozambique. 10-13 October, 2011.
 
Soybean inoculation in northern Mozambique, Muananamuale, C., Ussene, R., Boahen, S., Chikoye, D. and Dakora, F. D.*, Abstract (Poster), p. 287 in the Proceedings of the 10th African Crop Science Society Conference,"from soil to soul- crop production for improved African livelihoods and better environment for future generations", held in Maputo, Mozambique. 10-13 October, 2011.
 
Using value chain analysis to target agricultural research-for-development investments in grain legumes in Mozambique, Rusike, J., Boahen, S., Dashiell, K.+ and Cachomba, I.*, in: Proceedings of the 10th African Crop Science Society Conference "From Soil to Soul - Crop production for improved African Livelihoods and a better environment for future generations" 10th-13th October 2011, Maputo, pages 1-14, African Crop Science Society, 2011.
 
Effects of spring post-planting flooding on early soybean production in Mississippi, Zhang, L. and Boahen, S., in: Crop Management, ISSN 1543-7833, 2011. [DOI]
 
Evaluating plant growth and nitrogen fixation in four promiscuous and three non-promiscuous soybean genotypes planted in Mozambique, Gyogluu, C.*, Boahen, S. and Dakora, F. D.*, Abstract (Poster), p. 255 in the Proceedings of the 10th African Crop Science Society Conference,"from soil to soul- crop production for improved African livelihoods and better environment for future generations", held in Maputo, Mozambique. 10-13 October, 2011.
 
Effect of inoculant formulations on N2 fixation in field-grown Soybean genotypes at Mozambique, Mashakoe, R. M.*, Boahen, S. and Dakora, F. D.*, Abstract (Poster), p. 284 in the Proceedings of the 10th African Crop Science Society Conference,"from soil to soul- crop production for improved African livelihoods and better environment for future generations", held in Maputo, Mozambique. 10-13 October, 2011.
 
Performance of determinate and indeterminate Soybean genotypes in Mozambique, Boahen, S., Chikoye, D., Tefera, H. and Abaidoo, R., Abstract, p. 88 in the Proceedings of the 10th African Crop Science Society Conference,"from soil to soul- crop production for improved African livelihoods and better environment for future generations", held in Maputo, Mozambique. 10-13 October, 2011.
 

2010

Targeting cowpea breeding and seed delivery efforts to enhance poverty impacts in sub-Saharan Africa, Coulibaly, O., Alene, A., Abdoulaye, T., Chianu, J., Manyong, V., Aitchedji, C., Fatokun, C., Kamara, A., Ousmane, B., Tefera, H. and Boahen, S., Abstract (Oral presentation) in Program and Book of Abstracts of the 5th World Cowpea Research Conference, held at Palm Beach Hotel, Saly, Senegal. 27 September - 1 October, 2010.
 
Distribution and potential impact of cassava variety spread by UPoCA, Okechukwu, R., James, B., Ntawuruhunga, P., Mahungu, N., Boahen, S., Kanju, E., Osei-Sarfoh, A., Fannah, S., Jumbo, S., Sonder, K. and Alabi, T. R., Abstract in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Controlling virus diseases of cowpea in sub-Saharan Africa: status and prospects, Kumar, P. L., Fatokun, C., Dumet, D., Boukar, O. and Boahen, S., Abstract (Oral presentation) in Program and Book of Abstracts of the 5th World Cowpea Research Conference, held at Palm Beach Hotel, Saly, Senegal. 27 September - 1 October, 2010.
 
Evaluation of promiscuous soybean genotypes at Chitedze, Malawi, Tefera, H., Kanaji, G.*, Boahen, S. and Chikoye, D., Abstract presented at ASA-CSSA-SSSA 2010 International Annual Meeting October 31-November 4, Long Beach, CA, (published online), 2010.
 
An appraisal of cowpea virus diseases in Malawi, Mozambique and Zambia, Kumar, P. L., Ogunsanya, P., Boahen, S., Tefera, H., Boukar, O., Legg, J., Coyne, D. and Tamo, M., Abstract (Poster) in Program and Book of Abstracts of the 5th World Cowpea Research Conference, held at Palm Beach Hotel, Saly, Senegal. 27 September - 1 October, 2010.
 
Simulation and prediction of soybean growth and development under field conditions, Zhang, L., Zhang, J., Boahen, S. and Zhang, M., in: American-Eurasian Journal of Agricultural and Environmental Sciences, volume 7, number 4, pages 374-385, ISSN 1818-6769, 2010.
 
Evaluation of critical shattering time of early-maturity soybeans under early soybean production system, Zhang, L. and Boahen, S., in: Agriculture and Biology Journal of North America, volume 1, number 4, pages 440-447, ISSN 2151-7517. Online: 2151-7525, 2010.
 
Growth and yield of determinate and indeterminate soybeans in Mozambique, Boahen, S., Chikoye, D., Tefera, H. and Abaidoo, R., Abstract presented at ASA-CSSA-SSSA 2010 International Annual Meeting October 31-November 4, Long Beach, CA, (published online), 2010.
 

2009

Symbiotic efficacy of two soybean genotypes inoculated with Bradyrhizobium japonicum WB74 strain Nampula, Mozambique, Mashakoe, R. M.*, Boahen, S. and Dakora, F. D.*, in: Abstract of the African Crop Science Society 9th Conference, Cape Town, South Africa, African Crop Science Society, 2009.
 
Plant growth and symbiotic functioning of field grown promiscuous soybean genotypes in Mozambique, Gyogluu, C.*, Boahen, S. and Dakora, F. D.*, in: ACSS Annual Meeting, Sept 28 - Oct 1, Cape Town RSA, 2009.
 
Screening and evaluation of soybean genotypes in Mozambique, Boahen, S., Chikoye, D., Tefera, H. and Abaidoo, R., in: Abstract of the African Crop Science Society 9th Conference Cape Town, South Africa, African Crop Science Society, 2009.
 
Soybean varietal evaluation and selection in Mozambique, Boahen, S., Chikoye, D. and Tefera, H., in: American Society of Agronomy conference, Pittsburg, USA, 1-5 November, 2009: book of abstracts, American Society of Agronomy, Wisconson, USA, 2009.