John Nyameasem

BLE project smartMaN2agement  (Site-specific modelling of N dynamics to reduce gaseous N emissions and other N losses in crop production).

The project focuses on reducing N₂O and NH₃ emissions and N leaching through predictable, informed, and site-adapted management in crop production. Long-term experiments, selected for sampling and modelling, cover key management practices such as crop rotation with catch crops, tillage with mulching of high-N crops, and various mineral and organic fertilization methods. The project emphasizes modelling, utilizing extensive data from long-term trials to validate the models, aiming for a comprehensive evaluation. During the project, we will derive well-founded statements on the impacts of different farming systems, crop rotations, soil tillage, and fertilization practices tailored to specific locations and farming systems. These findings will be regionalized to the federal territory and processed for practical agricultural application and consulting.

Verma, S., Herrmann, A., Taube, F., Nyameasem, J. K., Ehrhard, D., Malisch, C. S., Kluß, C., & Poyda, A. (2026). Functional diversity enhances grassland productivity, but species identity drives performance. Agriculture, Ecosystems & Environment, 397, 110091. https://doi.org/10.1016/j.agee.2025.110091

Friedhelm Taube, John Nyameasem, Christof Kluß & Sandra Koop (2025). Wege zur Klimaneutralität der Sektoren Landwirtschaft und Bodennutzung (LULUC): Eine semi-quantitative Potentialanalyse für Norddeutschland am Beispiel des Bundeslandes Schleswig-Holstein. Bundesministerium für Ernährung und Landwirtschaft (BMEL); Band 103, Heft 1, Juni 2025. https://doi.org/10.12767/buel.v103i1.536  

Taube, F., Nyameasem, J.K. & Verma, S. (2025). The role of grasslands in mixed farming/crop-livestock systems.  In Advances in temperate grassland science and management (ed. Dr Agnes van den Pol-van Dasselaar). Burleigh Dodds Series in Agricultural Science, 169, 600pp.  ISBN: 1801469032, 9781801469036.

Nyameasem, J.K., Taube, F., Kluß, C., Neumann, S. & Reinsch T. (2024). The effects of fertilizer pretreatment on nitrogen cycling in an intensively managed temperate grassland. Agriculture, Ecosystems & Environment, 375: 109185. https://doi.org/10.1016/j.agee.2024.109185

Nyameasem, J. K., De Los Rios, J., Kluß, C., Reinsch, T., Poyda, A., Taube, F., et al. (2024). Incorporating leys in arable systems as a mitigation strategy to reduce soil organic carbon losses during land-use change. Front. Environ. Sci. 12. https://doi.org/10.3389/fenvs.2024.1399197

Taube, F., Nyameasem, J. K., and Fenger, F. (2024). “Closed-loop combined crop-livestock farming systems” In Developing circular agricultural production systems (Editor: Barbara Amon). Burleigh Dodds Series in Agricultural Science 135: 335-64. https://www.taylorfrancis.com/books/edit/10.1201/9781003412052/developing-circular-agricultural-production-systems-barbara-amon

Taube, F., Nyameasem, J. K., Fenger, F., Alderkamp, L., Kluß, C., and Loges, R. (2024). Eco-efficiency of leys—The trigger for sustainable integrated crop-dairy farming systems. Grass Forage Science 79:108–119. https://doi.org/10.1111/gfs.12639

Nyameasem, J. K., Ruser, R., Kluß, C., Essich, C., Zutz, M., ten Huf, M., et al. (2023). Effect of slurry application techniques on nitrous oxide emission from temperate grassland under varying soil and climatic conditions. Grass and Forage Science 78, 338–358. https://doi.org/10.1111/gfs.12612

Nyameasem, J. K., Zutz, M., Kluß, C., Huf, M. ten, Essich, C., Buchen-Tschiskale, C., et al. (2022). Impact of cattle slurry application methods on ammonia losses and grassland nitrogen use efficiency. Environmental Pollution 315, 120302. https://doi.org/10.1016/j.envpol.2022.120302

Nyameasem, J. K., Ben Halima, E., Malisch, C. S., Razavi, B. S., Taube, F., and Reinsch, T. (2021). Nitrous Oxide Emission from Forage Plantain and Perennial Ryegrass Swards Is Affected by Belowground Resource Allocation Dynamics. AGRONOMY-BASEL 11. https://doi.org/10.3390/agronomy11101936

Nyameasem, J. K., Malisch, C. S., Loges, R., Taube, F., Kluß, C., Vogeler, I., et al. (2021). Nitrous Oxide Emission from Grazing Is Low across a Gradient of Plant Functional Diversity and Soil Conditions. Atmosphere 12, 223. https://doi.org/10.3390/atmos12020223

Nyameasem, J. K., Reinsch, T., Taube, F., Domozoro, C. Y. F., Marfo-Ahenkora, E., Emadodin, I., et al. (2020). Nitrogen availability determines the long-term impact of land use change on soil carbon stocks in the grasslands of southern Ghana. SOIL 6, 523–539. https://doi.org/10.5194/soil-6-523-2020

Ahiagbe, K.M.J., Amuzu-Aweh, E.N., Bonney, P., Nyameasem, J.K., Avornyo, F.K., Adenyo, C., Amoah, K.O., Naazie, A. & Kayang, B.B. (2021). Comparison of early growth and survivability in indigenous guinea fowls from Northern Ghana. Tropical Animal  Health  and Production 53, 89. https://doi.org/10.1007/s11250-020-02510-4.

Adu-Aboagye, G., Nyameasem, J.K., Ahiagbe, K.M.J., Ansah, K.O., Zagbede, G.A. & Agbe, K.K. (2020). Reproductive traits of the indigenous Guinea fowl under tropical humid conditions; the effect of egg size. Livestock Research for Rural Development  32, 55. http://www.lrrd.org/lrrd32/4/gadua32055.htm

Nyameasem, J.K., Akoloh, M. & Adu, E.K. (2018). Effects of protein content on feed intake and performance of grasscutters fed diets containing forage meal. Animal  Production Science. 10.1071/AN15889

Nyameasem, J.K., Affedzie-Obresi, S. & Adu, E.K. (2018). Time of feeding and predictability of dry matter and water intake of grasscutters fed on grass and supplements containing varying levels of dietary fiber. Tropical Animal  Health and Production. 10.1007/s11250-018-1573-z

Wallace, P.A., Nyameasem, J.K., Aboagye, G.A., Nkegbe, K., Murray, F., Botchway, V., Karbo, N., Leschen, W., Maquart, P-O. & Clottey, V. (2018). Effects of replacing fishmeal with black soldier fly larval meal in the diets of grower-finishing guinea fowls reared under tropical conditions. Tropical Animal Health and Production. 10.1007/s11250-018-1588-5.

Wallace, P.A., Nyameasem, J.K., Amoah, K.O. & Beyuo, J. (2018). Biochemical and haematological response of growing grasscutters fed freshly harvested Panicum  maximum  alone or supplemented with Leucaena leucocephala treated with 0, 1 or 2 per cent salt solution. Ghanaian  Journal of Animal  Science 9 (1):58-65. 

Wallace, P.A., Nyameasem, J.K., Adu-Aboagye, G.A., Affedzie-Obresi, S., Nkegbe, E.K., Karbo, N., Murray, F., Leschen, W. & Maquart, P-O. (2017). Impact of black soldier fly larval meal on growth performance, apparent digestibility, haematological and blood chemistry indices of guinea fowl starter keets under tropical conditions. Tropical Animal  Health and Production 
49(6):1163-1169, 10.1007/s11250-017-1312-x

Nyameasem, J.K., Amoah, K.O., Wallace, P.A. & Adu, E.K. (2017). Nitrogen partitioning and growth in grasscutters fed freshly cut Panicum maximum  alone or supplemented with Leucaena lecocephala  treated with 0, 1 or 2 per cent saline solution. Livestock Research for Rural Development 29(24), http://www.lrrd.org/lrrd29/2/nyam29024.htm

Nyameasem, J.K., Adu, E.K., Amoah, K.O. & Hagan, B.A. (2016). The effect of male proximity on vagina patency, oestrus cycle length and feed intake of female grasscutters. Tropical Animal  Health and Production 48, 445-449, 10.1007/s11250-015-0972-7.

Hagan, B.A., Nyameasem, J.K., Asafu-Adjaye, A. & Daffour-Oduro, K.A. (2016). Predicting live weight of grasscutters using their linear body measurements. Livestock Research for Rural Development, 28(143), http://www.lrrd.org/lrrd28/8/haga28143.html

Hagan, B.A., Nyameasem, J.K., Asafu-Adjaye, A. & Duncan, J.L. (2014). Effects of non-genetic factors on the birth weight, litter size and pre -weaning survivability of West African Dwarf goats in the Accra Plains. Livestock Research for Rural Development  26(13), http://www.lrrd.org/lrrd26/1/haga26013.html

Amoah, K.O., Nyameasem, J.K., Asiedu, P., Adu-Aboagye, G.A., Wallace, P., Ahiagbe, K.M.J. & Rhule, S. W. A. (2018). Protein and energy requirements for indigenous guinea keets (Numida meleagris)  in southern Ghana. Ghana Journal of Agricultural  Science, 52, pp. 105-111. https://www.ajol.info/index.php/gjas/article/view/179721

Adu, E.K., Asafu-Adjaye, A., Hagan. B.A. & Nyameasem, J.K. (2017). The grasscutter: an untapped resource of Africa's grasslands. Livestock Research for Rural Development, 29(47), http://www.lrrd.org/lrrd29/3/jnya29047.html

Karikari. P.K. & Nyameasem, J.K. (2009). Productive performance and Carcass Characteristics of Captive Thryonomys swinderianus fed Concentrate diets containing varying levels of Panicum maximum. World Applied Sciences Journal, 6(4), 557-563, http://www.idosi.org/wasj/wasj6(4)/18.pdf