Titles (102)Keywords (1)Abstracts (4)
A robust DayCent model calibration to assess the potential impact of integrated soil fertility management on maize yields, soil carbon stocks and greenhouse gas emissions in Kenya, Laub, M., Necpalova, M., Van de Broek, M., Corbeels, M., Ndungu, S. M., Mucheru-Muna, M.*, Mugendi, D.*, Yegon, R.*, Waswa, W., Vanlauwe, B. and Six, J., in: EGUsphere (Preprint), pages 1-47, 2023. [DOI]
 
Adoption and impacts of sustainable agricultural practices on maize yields and incomes: evidence from rural Zambia, Manda, J., Alene, A., Gardebroek, C., Kassie, M. and Tembo, G.*, in: Journal of Agricultural Economics, pages 1-24, ISSN 0021-857X, 2015. [DOI]
 
Alley farming with leucaena: effect of short grazed fallows on soil fertility and crop yields, Atta-Krah, A. N., in: Experimental Agriculture, volume 26, number 1, pages 1-10, 1990.
 
An analysis of factors associated with yields of climbing beans and Irish potatoes in the northern highlands of Rwanda, Burleigh, J. R., Yamoah, C. F., Regas, J. L. and Muskaruziga, C., in: Agriculture, Ecosystems and Environment, volume 41, number 3, pages 337-351, 1992.
 
An analysis of the effects of weather on maize yields in a humid tropical enviroment, Lawson, T. L., in: WMO/ FAO Technical conference on the application meteorology to Agriculture in Africa, IITA, Ibadan. April 12-16, 1977.
 
Analysis of yam yields using the additive main effects and multiplicative interaction (AMMI) model, Egesi, C. N.* and Asiedu, R., in: African Crop Science Journal, volume 10, number 3, pages 195-201, ISSN 1021-9730, 2002.
 
Application of secondary nutrients and micronutrients increases crop yields in sub-Saharan Africa, Kihara, J., Sileshi, G. W.*, Nziguheba, G., Kinyua, Z. M.*, Zingore, S. and Sommer, R., in: Agronomy for Sustainable Development, volume 37, number 4, pages 1-14, ISSN 1774-0746, 2017.
 
Assessment of the relationship between soil properties, Striga hermonthica infestation and the on-farm yields of maize in the dry Savannas of Nigeria, Ekeleme, F., Jibrin, J. M.*, Kamara, A., Oluoch, M., Samndi, A.* and Fagge, A.*, in: Crop Science, volume 66, pages 90-97, ISSN 0261-2194, 2014. [DOI]
 
Benefits of inoculation, P fertilizer and manure on yields of common bean and soybean also increase yield of subsequent maize, Rurangwa, E.*, Vanlauwe, B. and Giller, K., in: Agriculture, Ecosystems and Environment, pages 1-13, ISSN 0167-8809, 2017. [DOI]
 
Best practices to maintain high yields and grain quality of soybean: a checklist prepared by the N2Africa Project for farmers in west Kenya, N2Africa, , 2011.
 
Biochar addition persistently increased soil fertility and yields in maize-soybean rotations over 10 years in sub-humid regions of Kenya, Katterer, T., Roobroeck, D., Andren, O., Kimutai, G., Karltun, E., Kirchmann, H., Nyberg, G., Vanlauwe, B. and Roing de Nowina, K.+, in: Field Crops Research, volume 235, pages 18-26, ISSN 0378-4290, 2019. [DOI]
 
Biomass production and N fixation of five Mucuna pruriens varieties and their effect on maize yields in the forest zone of Cameroon, Hauser, S. and Nolte, C., in: Journal of Plant Nutrition and Soil Science, volume 165, pages 101-109, 2002.
 
Biophysical and crop management gradients limiting yields of east African highland banana (Musa spp. AAA-EA) within farms in low input cropping systems, Alou, I. N.*, Van Asten, P. and Tenywa, M.*, in: International Journal of Agricultural Science and Research (IJASR), volume 4, number 3, pages 27-44, ISSN 2250-0057, 2014.
 
Bradyrhizobium inoculants enhance grain yields of soybean and cowpea in Northern Ghana, Ulzen, J.*, Abaidoo, R. C.*, Mensah, N. E.*, Masso, C. and Abdelgadir, A. H., in: Frontiers in Plant Science, volume 7, pages 1-9, ISSN 1664-462X, 2016. [DOI]
 
Breeding for high and stable yields in Africa, Masajo, T.M., Alluri, F. M., Abifarin, A. O. and Janakiram, D., pages 107-114, 1986.
 
Cassava-maize intercropping systems in southern Nigeria: radiation use efficiency, soil moisture dynamics, and yields of component crops, Nwokoro, C. C., Kreye, C., Necpalova, M., Adeyemi, O.*, Barthel, M., Pypers, P . and Hauser, S., in: Field Crops Research, volume 283, number -: 108550, pages 1-16, ISSN 0378-4290, 2022. [DOI]
 
Climate warming causes declines in crop yields and lowers school attendance rates in central Africa, Fuller, T. L., Clee, P. R., Njabo, K. Y., Trochez, A., Morgan, K., Mene, D. B., Anthony, N. M., Gonder, M. K., Allen, W. R., Hanna, R. and Smith, T. B., in: Science of the Total Environment, volume 610-611, pages 503-510, ISSN 0048-9697, 2018. [DOI]
 
Climatic factor for higher yields of root crops, Lawson, T. L., in: Paper presented at West African Regional Root Crop Workshop, 27 June -2 July 1982, Moronvia, Liberia, 1982.
 
Coffea arabica yields decline in Tanzania due to climate change: global implications, Craparo, A.*, Van Asten, P., Laderach, P., Jassogne, L. and Grab, S.*, in: Agricultural and Forest Meteorology, volume 207, pages 1-10, ISSN 0168-1923, 2015. [DOI]
 
Cogongrass suppression by cover crops and subsequent maize yields in southwest Nigeria, Ekeleme, F. and Chikoye, D., in: Weed Science, volume 55, pages 792-797, 2003.
 
Combined application of biofertilizers and inorganic nutrients improves sweet potato yields, Mukhongo, R. W.*, Tumuhairwe, J. B.*, Ebanyat, P., Abdelgadir, A. H., Thuita, M. and Masso, C., in: Frontiers in Plant Science, volume 8, number 219, pages 1-17, ISSN 1664-462X, 2017. [DOI]
 
Combined use of soil fertility indicators and crop yields for determining appropriate cassava-based crop mixture for soils of eastern Nigeria, Asadu, C.* and Dixon, A., in: The small processor and development of local food industries for market economy: proceedings of the 8th Symposium of the International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 12-16 November 2001, IITA, Ibadan, Nigeria, pages 240-246, International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2004.
 
Combining manure with mineral N fertilizer maintains maize yields: evidence from four long-term experiments in Kenya, Laub, M., Corbeels, M ., Ndungu, S. M ., Mucheru-Muna, M.*, Mugendi, D.*, Necpalova, M., Van de Broek, M., Waswa, W. and Vanlauwe, B., in: Field Crops Research, volume 291, number -: 108788, pages 1-15, ISSN 0378-4290, 2023. [DOI]
 
Comparative evaluation of the contributions of soil physicochemical properties to variations in the yields of four major staple food crops in eastern Nigeria, Asadu, C.*, Dixon, A. and Okechukwu, R., in: Soils and Tillage Research, volume 65, number 2, pages 141-155, ISSN 0167-1987, 2002.
 
Comparison of component yields and sensory properties of traditional Nigerian foods (Ogi and Eko) derived from eleven maize varieties, Omueti, O.*, Iken, J.*, Kling, J. and Okoruwa, A., in: Journal of Food, Agriculture and Environment, volume 4, number 1, pages 115-118, ISSN 1459-0255, 2006.
 
Coupled forest zoning and agricultural intervention yields conflicting outcomes for tropical forest conservation in the Democratic Republic of the Congo (DRC), Nackoney, J., Demol, M., Akpona, H. A.*, Bauters, M., Boeckx, P., Dupain, J., Facheux, C.*, Hansen, M. C., Kalemba, J. C.*, Kehbila, A. G.*, Potapov, P., Senga, A. T.*, Turubanova, S., Williams, D. and Vanlauwe, B., in: Environmental Research Letters, volume 17, number 6: 064002, pages 1-11, ISSN 1748-9326, 2022. [DOI]
 
Cowpea cultivar mixtures for stable and optimal leaf and seed yields in a maize intercropping system, Kabululu, M. S., Ojiewo, C., Oluoch, M. and Maass, B. L., in: International Journal of Vegetable Science, volume 20, number 3, pages 270-284, ISSN 1931-5260, 2014. [DOI]
 
Cultural Studies on Taro , C esculenta (L. Schot). The relationship of Leaf Development, Suckering capacity Plant Population with Taro Yields, Ezumah, H. C. and Plucknett, D.L., in: Journal of Root Crops, volume 7, number 1,2, pages 41-52, 1981.
 
Distribution, relative importance and effect of lepidopterous borers on maize yields in the forest zone and mid-altitude of Cameroon, Ndemah, R., Schulthess, F., Korie, S., Borgemeister, C. and Cardwell, K., in: Journal of Economic Entomology, volume 94, pages 1434-1444, 2001.
 
Do commercial biological and chemical products increase crop yields and economic returns under smallholder farmer conditions?, Jefwa, J.*, Pypers, P., Jemo, M., Thuita, M., Mutegi, E., Laditi, M. A, Faye, A.*, Kavoo, A. M.*, Munyahali, W., Herrmann, L., Atieno, M., Okalebo, J. R., Yusuf, A. A.*, Ibrahim, A.*, Ndung'u-Magiroi, K. W.*, Asrat, A.*, Muletta, D.*, Ncho, C.*, Kamaa, M. and Lesueur, D., pages 81-96, chapter 7, Springer, ISBN 978-3-319-07662-1, 2014. [DOI]
 
Do voluntary certification standards improve yields and wellbeing? Evidence from oil palm and cocoa smallholders in Ghana, Brako, D. E., Asare, R. and Alexandros, G., in: International Journal of Agricultural Sustainability, volume 19, number 1, pages 16-39, ISSN 1473-5903, 2020. [DOI]
 
Effect of chicken manure application on cassava biomass and root yields in two agro-ecologies of Zambia, Biratu, G. K., Elias, E.*, Ntawuruhunga, P. and Nhamo, N., in: Agriculture, volume 8, number 4, pages 1-15, ISSN 2077-0472, 2018. [DOI]
 
Effect of delayed cassava planting on yields and economic returns of a cassava-groundnut intercrop in the Democratic Republic of Congo, Nyi, T., Mucheru-Muna, M.*, Shisanya, C.*, Lodi-lama, J-P., Mutuo, P., Pypers, P. and Vanlauwe, B., in: World Journal of Agricultural Research, volume 2, number 3, pages 101-108, ISSN 2333-0643, 2014. [DOI]
 
Effect of dosage sequence on the efficacy of non fumigant nematicides, plantain yields and nematode seasonal fluctuations as influenced by rainfall, Badra, T. and Caveness, F. E., in: Journal of Nematology, volume 15, 1983.
 
Effect of shoot removal on shoot and tuberous root yields and yield components of sweet potatoes, Dahniya, M. T., Hahn, S. K. and Oputa, C. O.*, in: Experimental Agriculture, 1983.
 
Effect of staw application on rice yields and nutrient availability on an alkaline and a pH-neutral soil in a Sahelian irrigation scheme, Van Asten, P., van Bodegom, P. M., Mulder, L .M. and Kropff, M. J., in: Nutrient Cycling in Agroecosystems, volume 72, pages 255-266, ISSN 1385-1314, 2005.
 
Effects of harvesting frequency on leaf and root yields of cassava, Dahniya, M. T., Oputa, C. O.* and Hahn, S. K., in: Experimental Agriculture, volume 17, number 1, pages 91-95, ISSN 0014-4797, 1981.
 
Effects of no-tillage and alley cropping on soil properties and crop yields in a Typic Kandiudult of southern Cameroon, Hulugalle, N. and Ndi, J., in: Agroforestry Systems, volume 22, number 3, pages 207-220, 1993.
 
Effects of site-specific fertilizer recommendations and integrated soil fertility management practices on crop yields and incomes in the Ethiopian highlands: baseline report, Alene, A., Assfaw Wossen, T., Ampadu-Boakye, T., Tigabie, A. and Desta, G., 2024.
 
Enhencing rice yields through improved fertilizer efficiency, Mahapatra, I. C., 1976.
 
Evaluation of genotypic variability and analysis of yield and its components in irrigated rice to stabilize yields in the Senegal river valley affected by climate change, Moukoumbi, Y. D., Bayendi Loudit, S. M.*, Sikirou, M., Mboj, D., Hussain, T.*, Bocco, R. and Manneh, B., in: Agronomy, volume 13, number 9: 2218, pages 1-15, ISSN 2073-4395, 2023. [DOI]
 
Exclusion of soil macrofauna did not affect soil quality but increased crop yields in a sub-humid tropical maize-based system, Paul, B. K., Vanlauwe, B., Hoogmoed, M., Hurisso, T. T., Ndabamenye, T.*, Terano, Y., Ayuke, F.* and Pulleman, M. M., in: Agriculture, Ecosystems and Environment, volume 208, pages 75-85, ISSN 0167-8809, 2015. [DOI]
 
Exploiting symbiotic nitrogen fixation for increasing soybean yields in Africa, Rao, R. V., Ayanaba, A., Eaglesham, A.R.J. and Kueneman, E., 1980.
 
Exploiting symbiotic nitrogen fixation for increasing soybean yields in Africa, Rao, V, Ayanaba, A., Eaglesham, A.R.J. and Kueneman, E., pages 153-167, Academic Press, 1981.
 
Farmers' maize yields in S.W. Nigeria and the effect of variety and fertilizer: An analysis of variability in on-farm trials, Mutsaers, H. J. W. and Walker, P., in: Field Crops Research, volume 23, pages 265-278, 1990.
 
Fertilisers differentially affect facultative and obligate parasitic weeds of rice and only occasionally improve yields in infested fields, Tippe, D. E., Bastiaans, L., Van Ast, A., Dieng, I., Cissoko, M., Kayeke, J.*, Makokha, D. W.* and Rodenburg, J., in: Field Crops Research, volume 254, number -: 107845, pages 1-13, ISSN 0378-4290, 2020. [DOI]
 
Genotype X Environment interaction of mosaic disease, root yields and total carotene concentration of yellow-fleshed cassava in Nigeria, Maroya, N., Kulakow, P., Dixon, A.* and Maziya-Dixon, B., in: International Journal of Agronomy, volume 2012, number ID 434675, pages 1-8, ISSN 1687-8159, 2012. [DOI]
 
Grain yields of rust resistant promiscuous soybean lines in the Guinea Savanna of Nigeria, Tefera, H., Bandyopadhyay, R. and Boukar, O., African Crop Science Society, 2009.
 
Grain yields of rust resistant promiscuous soybean lines in the Guinea savanna of Nigeria, Tefera, H., Bandyopadhyay, R., Adeleke, R., Boukar, O. and Ishaq, M.*, in: African Crop Science Conference Proceedings, 28 September - 2 October 2009, Southern Cape Sun Hotel, Cape Town, South Africa, pages 129-134, African Crop Science Society, 2009.
 
Groundnut (Arachis hypogaea) for food and fodder in crop-livestock systems: forage and seed yields, chemical composition and rumen degradation of leaf and stem fractions of 38 cultivars, Larbi, A., Dung, D. D.*, Olorunju, P., Smith, J. W., Tanko, R., Muhammad, I. R.* and Adekunle, I. O.*, in: Animal Feed Science and Technology, volume 77, number 1-2, pages 33-47, ISSN 0377-8401, 1999.
 
Groundnut, maize and cassava yields in mixed-food crop fields after calliandra tree fallow in southern Cameroon, Nolte, C., Tiki-Manga, T.*, Badjel-Badjel, S.*, Gockowski, J. and Hauser, S., in: Experimental Agriculture, volume 41, number 1, pages 21-37, ISSN 0014-4797, 2005. [DOI]
 
Groundnut/cassava/maize intercrop yields over three cycles of planted tree fallow/crop rotations on Ultisol in Southern Cameroon, Hauser, S., in: Biological Agriculture and Horticulture, volume 25, pages 379-399, ISSN 0144-8765, 2008.
 
Groundnut/cassava/maize yields over three cycles of a fallow/crop rotation with planted Senna spectabilis, Flemingia macrophylla and Dactyladenia barteri on Ultisol, Hauser, S., in: TROPENTAG 2006, 11-13 October, 2006, Bonn, Germany, 2006.
 
Growth rates and yields of three cassava cultivars on the Njala gravely upland soils in Sierra Leone, George, J.*, Lahai, M.*, Ekanayake, I. J. and Dahniya, M. T., in: Root crops and poverty alleviation: proceedings of the Sixth Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), Lilongwe, Malawi, 22-28 October 1995, pages 382-387, International Institute of Tropical Agriculture: ISTRC-AB, 1998.
 
Improvement in grain and fodder yields of cowpea genotypes representing four decades of breeding in the Nigerian Sudan savannas, Kamara, A., Ajeigbe, H., Ewansiha, S. U., Boukar, O., Okechukwu, R., Tefera, H. and Omoigui, L., Abstract (Oral presentaion) 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.
 
Improvement in grain and fodder yields of early-maturing promiscuous soybean varieties in the Guinea savanna of Nigeria, Tefera, H., Kamara, A., Asafo-Adjei, B.* and Dashiell, K.+, in: Crop Science, volume 49, pages 2037-2042, ISSN 0011-183X, 2009.
 
Improving plantain (Musa spp. AAB) yields on smallholder farms in West and Central Africa, Norgrove, L. and Hauser, S., in: Food Security, volume 6, number 4, pages 501-514, ISSN 1876-4517, 2014. [DOI]
 
Increased cassava growth and yields through improved variety use and fertilizer application in the highlands of South Kivu, Democratic Republic of Congo, Munyahali, W.*, Birindwa, D. R.*, Pypers, P ., Swennen, R., Vanlauwe, B. and Merckx, R ., in: Field Crops Research, volume 302, number -: 109056, pages 1-9, ISSN 0378-4290, 2023. [DOI]
 
Influences of shading and fertilization on on-farm yields of cocoa in Ghana, Asare, R., Asare, R. A.*, Asante, W. A.*, Markussen, B. O. and Raebild, A., in: Experimental Agriculture, pages 1-16, ISSN 0014-4797, 2016. [DOI]
 
Intercrop yields of cassava and rice as influenced by cassava variety and population, Dahniya, M. T., Jalloh, A.* and Ezumah, H. C., in: Tropical root crops in developing economy: proceedings of the 9th Symposium of the Internationl Society fo Tropical Root Crops, 20-26 October 1991, Accra, Ghana, pages 194-199, ISTRC; Government of Ghana; International Institute of Tropical Agriculture (IITA), 1994.
 
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]
 
Legume and cereal seed production for improved crop yields in Nigeria: proceedings of the training workshop on Production of Legume and Cereal Seeds held on 24 January-10 February, 2008 at IITA-Kano Station, Kano, Nigeria, Ajeigbe, H., Abdoulaye, T. and Chikoye, D., 2009.
 
Legume rotation in the moist tropical savanna: managing soil nitrogen dynamics and cereal yields in farmers’ fields, Oikeh, S., Chude, V.*, Carsky, R., Weber, G. and Horst, W. J., in: Experimental Agriculture, volume 34, number 1, pages 73-83, ISSN 0014-4797, 1998.
 
Leucaena + maize alley cropping in Malawi: Part 1: Effects of N, P, and leaf application on maize yields and soil properties, Jones, R., Wendt, J ., Bunderson, W. and Itimu, O., in: Agroforestry Systems, volume 33, number 3, pages 281-294, 1996.
 
Long-term assessment of nitrogen and variety technologies on attainable maize yields in Nigeria using CERES-maize, Jagtap, S., Abamu, F. J.* and Kling, J., in: Agricultural Systems, volume 60, pages 77-86, ISSN 0308-521X, 1999.
 
Machine learning model accurately predict maize grain yields in conservation agriculture systems in southern Africa, Muthoni, F. K., Thierfelder, C., Mudereri, B. T., Manda, J., Bekunda, M. and Hoeschle-Zeledon, I., 2021.
 
Maize yields in a Mucuna pruriens var. Utilis and Pueraria phaseoloides relay fallow system on an Ultisol in southern Cameroon, Hauser, S., Henrot, J. and Hauser, A., in: Biological Agriculture and Horticulture, volume 20, pages 243-256, ISSN 0144-8765, 2002.
 
Maize: tackling a disease that means low yields, Babaleye, T., in: International Agricultural Development, volume 6, number 4, pages 17, 1986.
 
Managing cassava stem cuttings for optimum root yields, Akoroda, M., in: Proceedings of the 9th Triennial Symposium of ISTRC-AB, 1-5 November 2004, Mombasa, Kenya., 2004.
 
Managing phosphate rock to improve nutrient uptake, phosphorus use efficiency, and carrot yields, Mwangi, E.*, Ngamau, C.*, Wesonga, J. M.*, Karanja, E., Musyoka, M. W., Matheri, F., Fiaboe, K., Bautze, D. and Adamtey, N., in: Journal of Soil Science and Plant Nutrition, volume 20, pages 1350-1365, ISSN 0718-9508, 2020. [DOI]
 
Managing stem cuttings of cassava for optimum yields, Akoroda, M., Dixon, A., Ilona, P., Ogbe, F. and Okechukwu, R., in: Proceedings of 9th ISTRC-AB symposium, 1 - 5 November 2004, pages 335-341, Mombasa, Kenya, 2007.
 
Managing stem cuttings of cassava for optimum yields, Akoroda, M., Ilona, P., Okechukwu, R. and Ogbe, F., in: Book of Abstracts of the 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 31 October-5 November 2004, Mombasa, Kenya, 2004.
 
Mixed outcomes from conservation practices on soils and Striga-affected yields of a low-input, rice-maize system in Madagascar, Rodenburg, J., Randrianjafizanaka, M. T.*, Buchi, L., Dieng, I., Andrianaivo, A. P.*, Ravaomanarivo, L. H.* and Autfray, P., in: Agronomy for Sustainable Development, volume 40, number -: 8, pages 1-11, ISSN 1774-0746, 2020. [DOI]
 
Modelling the impacts of diverse cover crops on soil water and nitrogen and cash crop yields in a sub-tropical dryland, Garba, I. I., Bell, L. W., Chapman, S. C., deVoil, P., Kamara, A. and Williams, A., in: Field Crops Research, volume 301, number -: 109019, pages 1-14, ISSN 0378-4290, 2023. [DOI]
 
On-farm carbon sequestration and cocoa yields in Ghana's cocoa ecosystem, Afele, J. T.*, Kwame Nkrumah University of Science and Technology, 2020.
 
On-farm cocoa yields increase with canopy cover of shade trees in two agro-ecological zones in Ghana, Asare, R., Markussen, B. O., Asare, R. A.*, Anim-Kwapong, G.* and Raebild, A., in: Climate and Development, pages 1-11, ISSN 1756-5529, 2018. [DOI]
 
Poor farmers - poor yields: socio-economic, soil fertility and crop management indicators affecting climbing bean productivity in northern Rwanda, Franke, A. C.*, Baijukya, F., Kantengwa, S ., Reckling, M., Vanlauwe, B. and Giller, K., in: Experimental Agriculture, pages 1-21, ISSN 0014-4797, 2016. [DOI]
 
Potassium and magnesium fertilizers on banana in Uganda: yields, weevil damage, foliar nutrient status, and DRIS analysis, Gold, C., Smithson, P., McIntyre, B., Ssali, H.*, Night, G. and Okech, S., in: Nutrient Cycling in Agroecosystems, volume 69, pages 43-49, 2004.
 
Potential impacts of increasing average yields and reducing maize yield variability in Africa, Kostandini, G., La Rovere, R. and Abdoulaye, T., in: Food Policy, volume 43, pages 213-226, ISSN 0306-9192, 2013. [DOI]
 
Progress with lower yields: the case of early maturing corn in West Africa, Knipscheer, H. C., 1980.
 
Push-pull strategy combined with net houses for controlling cowpea insect pests and enhancing crop yields, Diabate, S., Martin, T., Murungi, L. K.*, Fiaboe, K., Wesonga, J. M.*, Kamani, J. M.* and Deletre, E., in: Crop Protection, volume 141, number -: 105480, pages 1-10, ISSN 0261-2194, 2021. [DOI]
 
Reducing speargrass (Imperata cylindrica) with conservation agriculture involving farmers in research to reduce labor and herbicide use and to conserve yields, Nielsen, O., Manyong, V., Ellis-Jones, J., Streibig, J. and Chikoye, D., in: Paper presented at: 6th Biennial Conference of the African Crop Science Society; 12-17 October, Nairobi, Kenya, 2003.
 
Relation of yields of soybean and maize to sulphur, zinc and copper status of soils under intensifying cropping systems in the tropical savannas of north-east Nigeria, Kwari, J.*, Kamara, A., Ekeleme, F. and Omoigui, L., in: Journal of Food, Agriculture and Environment, volume 7, number 1, pages 129-133, ISSN 1459-0255, 2009.
 
Selected shade tree species improved cocoa yields in low-input agroforestry systems in Ghana, Asitoakor, B. K.*, Vaast, P., Raebild, A., Ravn, H. P., Eziah, V. Y.*, Owusu, K.*, Mensah, E. O.* and Asare, R., in: Agricultural Systems, volume 202, number -: 103476, pages 1-9, ISSN 0308-521X, 2022. [DOI]
 
Short- and medium-term impact of manual tillage and no-tillage with mulching on banana roots and yields in banana-bean intercropping systems in the East African Highlands, Muliele, T.*, Bielders, C. and Van Asten, P., in: Field Crops Research, volume 171, pages 1-10, ISSN 0378-4290, 2015. [DOI]
 
Soil fertility variability in relation to the yields of maize and soybean under intensifying cropping systems in the tropical savannas of northeastern Nigeria, Kwari, J.*, Kamara, A., Ekeleme, F.* and Omoigui, L.*, volume 1, pages 457-464, chapter 1 Part II, Springer, ISBN 978-90-481-2541-8, 2011. [DOI]
 
Soil mineral N dynamics and maize grain yields following Centrosema macrocarpum and Stylosanthes guianensis: effects of different improved fallow rotations and varying levels of N fertilizer to maize, Muhr, L., Tarawali, S., Peters, M. and Schultze-Kraft, R., in: Field Crops Research, volume 78, pages 197-209, 2002.
 
Soil nutrient and cassava yields variations under continuous cultivation of three-crop mixtures in eastern Nigeria, Asadu, C.* and Dixon, A., in: Proceedings of the 13th ISTRC-Government symposium, pages 240-247, Arusha, Tanzania, 2007.
 
Soil properties and crops yields under continous cultivation with different management systems, Sobulo, R.A and Osiname, O.*, pages 363-370, 1986.
 
Soil temperatures during burning of large amounts of wood, effects on soil pH and subsequent maize yields, Hauser, S., in: TROPENTAG 2006, 11-13 October, Bonn, Germany, 2006.
 
Structural approaches to modeling the impact of climate change and adaptation technologies on crop yields and food security, Islam, S., Cenacchi, N., Sulser, T. B., Gbegbelegbe, S., Hareau, G., Kleinwechter, U., Manson-D'Croz, D., Nedumaran, S., Robertson, R., Robinson, S. and Wiebe, K., in: Global Food Security, volume 10, pages 63-70, ISSN 2211-9124, 2016. [DOI]
 
Study on cassava and sweetpotato yields in Mozambique, Andrade, M. and Naico, A., in: Proceedings of 9th ISTRC-AB symposium, 1- 5 November 2004, pages 200-208, Mombasa, Kenya, 2007.
 
Trens in food crop yields under demographic pressure in sub-Saharan Africa: the case of cassava in Southeast Nigeria, Enete, A., Nweke, F. and Okorji, E. C., in: Outlook on Agriculture, volume 24, number 4, pages 249-254, ISSN 0030-7270, 1995.
 
Unravelling drivers of high variability of on-farm cocoa yields across environmental gradients in Ghana, Asante, P. A., Rozendaal, D. M. A., Rahn, E., Zuidema, P. A., Quaye, A. K., Asare, R., Laderach, P. and Anten, N. P. R., in: Agricultural Systems, volume 193, number -: 103214, pages 1-10, ISSN 0308-521X, 2021. [DOI]
 
Urea briquettes combined with a fertilizer blend reduces fertilizer costs and improves yields of irrigated rice in Rwanda, Kayumba, J.*, Wendt, J., Cyamweshi, A. R.*, Ndayisaba, P. C.*, Kuyah, S.*, Ngunjiri, M., Rutebuka, J.* and Nabahungu, N. L., in: Agronomy Journal, volume 115, number 3, pages 1202-1213, ISSN 0002-1962, 2023. [DOI]
 
Use of modelling tools to assess climate change impacts on smallholder oil seed yields in South Africa, Kephe, P. N., Mkuhlani, S., Rusere, F.* and Chemura, A., in: PLoS ONE, volume 19, number 5: e0301254, pages 1-19, ISSN 1932-6203, 2024. [DOI]
 
Variability in agricultural and biological yields of ten musa genotypes evaluated for two cropping cycles in a sub-humid environment of Nigeria, Baiyeri, K. and Tenkouano, A., in: Journal of Crop Improvement, volume 21, number 1, pages 27-40, ISSN 1542-7528, 2008.
 
Weed biomass production and cassava yields in varying cassava cropping systems, Hauser, S., Ekeleme, F. and Dixon, A., Abstract, p. 175 in the book of abstracts of the Tropentag 2015: management of land use systems for enhanced food security - conflicts, controversies and resolutions, in Humboldt-Universitat Berlin, Germany, September 16 - 18, 2015.
 
What shapes yields of East African Highland banana? An explorative study from farmers' fields, den Braber, H., van de Ven, G., van Heerwaarden, J., Marinus, W., Ronner, E ., Descheemaeker, K. and Taulya, G., in: European Journal of Agronomy, volume 156, number -: 127141, pages 1-22, ISSN 1161-0301, 2024. [DOI]
 
Wheat farmers in Sudan record increased yields after adoption of proven technologies: TAAT news Vol. 1, TAAT, , 2019.
 
Yields of maize/cassava intercrops grown with hedgerows of three multipurpose trees on an acid Ultisol of Cameroon, Hauser, S., Ndi, J. and Hulugalle, N., in: Agroforestry Systems, volume 49, pages 111-122, ISSN 0167-4366, 2000.
 
Zero input technologies to increase yields in cassava production, IITA, , 2010.
 
Variability and grain yield potential of pearl millet (Pennisetum glaucum (L) R. Br.) genotypes under irrigated conditions in the Sudan, Ishaq, J.* and Meseka, S. K., in: Canadian Journal of Plant Breeding, volume 2, number 2, pages 76-79, ISSN 2291-6342, 2014.
 
Keywords:Pennisetum glaucum, Genotypes, heritability, yields, Sudan

Biological control of Imperata cylindrica, Beed, F., Charudattan, R. and Den Breeyen, A., in: Proceedings of the 4th International Weed Science Congress, 20-24 June 2004, Durban, South Africa, pages 33, 2004.
 
Abstract:
An overview will be provided of the prospects for the biological control of the rhizomatous grass Imperata cylindrica [(L.) Raeuschel]. Imperata cylindrica is an undisputed target for control technologies in West Africa as it reduces crop yields and causes the abandonment of agricultural land for resource poor farmers. Biological control can provide an environmentally friendly, sustainable and selective method that will be adopted if it provides advantages over alternative control strategies. The influence of variation between biotypes of I. cylindrica will be considered in relation to their control by a single biological organism. The potential of fungal pathogens recovered from surveys in West Africa will be evaluated including Colletotrichum caudatum, Drechslera gigantea, Exserohilum rostratum, Glomerella cingulata and Puccinia rufipes. Malaysian isolates of C. caudatum have previously been tested as a biocontrol agent against the biotype there and isolates of D. gigantea and E. rostratum from USA were included in bioherbicide preparations against an USA biotype of I. cylindrica. Puccinia rufipes could potentially control this weed; as it is a biotroph, it is likely to act as a physiological sink to deplete the carbohydrate reserves stored in the rhizomes. It is the mobilisation of this stored carbohydrate which facilitates this weed’s competitive advantage to rapidly produce leaves following disturbance to the ecosystem, such as in slash and burn agriculture. This rust pathogen has also been observed, along with other biotrophs, in South Africa, where I. cylindrica is not considered a weed.

Cassava improvement in sub-Saharan Africa: contributions of IITA and its partners, Dixon, A., Okechukwu, R., Ssemakula, G., Hanna, R., Thresh, J. M., Hughes, J., Ingelbrecht, I., Fregene, M.*, Legg, J., Mahungu, N., Nweke, F., Ntawuruhunga, P., Fauquet, C., Manyong, V., Neuenschwander, P., Whyte, J., Wydra, K., Asiedu, R., Egesi, C. N.*, Bandyopadhyay, R., Winter, S., Tarawali, G., Bokanga, M., Ezedinma, C., Sanni, L., Ferguson, M., Ogbe, F., Akoroda, M., Maziya-Dixon, B., Ilona, P., Ekanayake, I. J., Ariyo, O., Onyeka, J.*, Otim-Nape, G.*, Dahniya, M. T., Ortiz, R., Hahn, S. K. and Hartmann, P., 2008.
 
Abstract:
Cassava improvement in sub-Saharan Africa: contributions of IITA and its partners Dixon, A.G.O., R.U. Okechukwu, G. Ssemakula, R. Hanna, J.M. Thresh, J.d'A. Hughes, I. Ingelbrecht, M. Fregene, J. Legg, N. Mahungu, F. Nweke, J.P. Legg, P. Ntawuruhunga, C. Fauquet, V. Manyong, P. Neuenschwander, J. Whyte, K. Wydra, R. Asiedu, C.N. Egesi, R. Bandyopadhyay, S. Winter, G. Tarawali, M. Bokanga, C. Ezedinma, L. Sanni, M. Ferguson, F.O. Ogbe, M. Akoroda, B. Maziya-Dixon, P. Ilona, I.J. Ekanayake, O. Ariyo, J. Onyeka, G.W. Otim-Nape, M.T. Dahniya, R. Ortiz, S.K. Hahn and P. Hartmann Cassava is well recognized for its capacity to address food needs of vulnerable communities in unstable environments in SSA. IITA and colleagues in African NARS, in collaboration with CIAT and ARIs have played leading roles in the development of improved cassava varieties which are disease and pest resistant, early maturing, and high yielding. Through a combination of conventional and new approaches, over 400 cassava genotypes have been developed. The characteristics of the new generation of cassava germplasm broke what had been an apparent yield barrier in cassava improvement increasing yields in many locations by at least 50-100% without the use of fertilizer. The improved germplasm is shared with NARS within the region as specific genotypes or improved seed populations for evaluation and selection under local conditions. Improvement programs in Africa that received these materials have tested them under local conditions, selected varieties that outperform local varieties, and released them to farmers in virtually every major cassava producing country. Today, about 30% of the area cropped with cassava in Africa is planted with improved varieties. Without the introduction of more productive cultivars with multiple diseases and pest resistance, the effective biological control of the cassava mealybug and, to a certain extent, of the green mite, cassava production in SSA would be 50% or less of what it is today. That translates to over 13 million tons of dry cassava/year, enough to meet the calorie requirements of 65 million people. The significant gains in the crop's output in farmers' fields are not only contributing to the African diet but also propelling commercialization of the crop. This paper highlights contributions to cassava improvement in SSA since 1970 by IITA and its partners, and suggests areas needing strengthening in the drive to produce better crop varieties for different regions and enduses in Africa.

Evaluation of application timing in fertilizer micro-dosing technology on millet producing in Niger, West Africa, Hayashi, K., Abdoulaye, T., Gerard, B.* and Bationo, A.*, in: Nutrient Cycling in Agroecosystems, volume 80, pages 257-265, 2008. [DOI]
 
Abstract:
Micro-dosing technology has been developed by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) and its partners to help subsistence farmers in the Sahel improve inorganic fertilizer application. However, the ICRISAT's recommendations regarding fertilizer application through this technology are only applicable at sowing and do not allow any flexibility in terms of labor and/ or capital management. In rural areas, fertilizer cannot always be applied at sowing due to financial and labor constraints. The purpose of this study was to evaluate the effect of the timing of fertilizer application on millet production. A 2-year on-station experiment and a 1-year on-farm field experiment were conducted in the western region of Niger, West Africa. Even under the heterogeneous climatic conditions of the region during our experimental period, the results showed that the trend was the same as observed in previous studies: millet production improved through fertilizer application compared to the control (without fertilizer). The harvest index was also higher compared to that of the control. This increased production was consistently the same for all application timings. The marginal value-cost ratio on the investment calculated using a budgeting analysis for the on-farm experiment showed that-regardless of application timing-millet farmers who fertilized their fields with inorganic fertilizer made more profit than those who did not (control). This was also true for farmers who were unable to fertilize at sowing-delayed application was still the more profitable option relative to the no fertilizer control. Our results indicate that small subsistence farmers can be offered more options for inorganic fertilizer application timing using the micro-dosing technology. Delayed inorganic fertilizer application can help small farmers who are often labor constrained at the sowing period improve their yields as well as their economic returns.

Influence of phosphorus application on growth and yield of soybean genotypes in the tropical savannas of northeast Nigeria, Kamara, A., Abaidoo, R., Kwari, J.* and Omoigui, L., in: Archives of Agronomy and Soil Science, volume 53, number 5, pages 539-552, 2007.
 
Abstract:
The cultivation of soybean is increasing in the savannas of Nigeria due to its widespread use in the food and feed industry. Production is, however, constrained by low soil phosphorus (P) levels in northeast Nigeria. This study evaluated four soybean varieties for their response to three rates of P in two agro-ecozones in 2004 and 2005. Experimental design was a split-plot arrangement of treatments with three replications. The main plots were assigned the P treatments and subplots were soybean cultivars randomised within the main plots. The studies found that soybean responds to P application but differences between 20 and 40 kg P/ha were not significant, despite low test P levels. This may be due to limitations in other nutrients. More studies are needed to determine the synergistic effect of P and other nutrients on soybean growth and yield. Soybean growth and seed yield were lower in 2004 than in 2005 because trials were established comparatively late in 2004 and crops were therefore affected by late season moisture stress. There is, therefore, a need to establish the appropriate time for planting soybean in these zones. Late maturing varieties produced higher yields than early maturing varieties in 2005 probably due to early planting which allowed full use of the growing season.