All Stories

  1. Determining the optimal inoculant rate to maximize soybean productivity in the Guinea Savanna agro-ecological zone of Ghana

    Article • Scientific Reports, November 2025, Springer Science + Business Media

    Dr Jacob Ulzen

  2. Effect of partial-extreme root restriction and nutrient solution concentration on the performance of hydroponically grown tomato

    Article • Advances in Horticultural Science, August 2025, Firenze University Press

    Dr Jacob Ulzen

  3. Response of cocoa (Theobroma cacao L.) seedlings to multi‐nutrient fertilizer application in soilless growing media

    Article • Agrosystems Geosciences & Environment, July 2025, Wiley

    Dr Jacob Ulzen

  4. Global hotspots of mycorrhizal fungal richness are poorly protected

    Article • Nature, July 2025, Springer Science + Business Media

    Dr Jacob Ulzen, Prof. Peter Chatanga

  5. Potential of biochar‐based inoculant in enhancing rhizobia survival and grain yield of cowpea (Vigna unguiculata (L.) Walp.)

    Article • Agrosystems Geosciences & Environment, July 2025, Wiley

    Dr Jacob Ulzen

  6. Augmentation of mineral fertilizer with organic nutrient sources to improve soil quality and nutrient use efficiency in cocoa landscape in Ghana

    Article • Journal of Plant Nutrition, March 2025, Taylor & Francis

    Dr Jacob Ulzen

  7. Can Solar‐Powered Irrigation Systems Naturally Meet Crop Water Requirements? Proof of Concept From a Case Study in Sub‐Saharan Africa

    Article • Irrigation and Drainage, March 2025, Wiley

    Dr Jacob Ulzen

  8. A new phosphorus fertilizer blend enhances grain legume yield and profitability in northern part of Ghana

    Article • Scientific African, September 2024, Elsevier

    Dr Jacob Ulzen

  9. Impact of allelochemicals from shade trees bark on the performance of cocoa seedlings

    Article • Agrosystems Geosciences & Environment, July 2024, Wiley

    Dr Jacob Ulzen

  10. Mitigation of greenhouse gas emissions through shade systems and climate-smart soil fertility interventions in cocoa landscapes in the Semi-deciduous ecological zone of Ghana

    Article • Soil Advances, June 2024, Elsevier

    Dr Jacob Ulzen

  11. The tricot approach: an agile framework for decentralized on-farm testing supported by citizen science. A retrospective

    Article • Agronomy for Sustainable Development, January 2024, Springer Science + Business Media

    Dr Jacob Ulzen

  12. Grafting Experience and Shade Influences Graft Take of Avocado Scions

    Article • The Philippine journal of science, January 2024, Science and Technology Information Institute

    Dr Jacob Ulzen

  13. Growing media, water stress and re-watering effects on the growth and dry matter production of cocoa seedlings

    Article • Acta Universitatis Sapientiae Agriculture and Environment, December 2022, De Gruyter

    Dr Jacob Ulzen

  14. Soybean (Glycine max L. Merrill) responds to phosphorus application and rhizobium inoculation on Acrisols of the semi-deciduous forest agro-ecological zone of Ghana

    Article • PeerJ, March 2022, PeerJ

    Dr Jacob Ulzen

  15. Native Rhizobia Strains Enhance Seed Yield of Groundnut Varieties in Northern Ghana

    Article • Frontiers in Agronomy, May 2021, Frontiers

    Dr Jacob Ulzen

  16. Organic Manure Improves Soybean Response to Rhizobia Inoculant and P-Fertilizer in Northern Ghana

    Article • Frontiers in Agronomy, September 2020, Frontiers

    Dr Jacob Ulzen

  17. The tricot citizen science approach applied to on-farm variety evaluation: methodological progress and perspectives

    Article • January 2020, International Potato Center (CIP)

    Dr Jacob Ulzen

  18. Combined application of inoculant, phosphorus and organic manure improves grain yield of cowpea

    Article • Archives of Agronomy and Soil Science, October 2019, Taylor & Francis

    Dr Nana Ewusi-Mensah, Dr Jacob Ulzen

  19. On-farm evaluation and determination of sources of variability of soybean response to Bradyrhizobium inoculation and phosphorus fertilizer in northern Ghana

    Article • Agriculture Ecosystems & Environment, November 2018, Elsevier

    Dr Nana Ewusi-Mensah, Dr Jacob Ulzen

  20. Is there a need for Bradyrhizobium yuanmingense and B. japonicum reinoculation in subsequent cropping seasons under smallholder farmers’ conditions?

    Article • Applied Soil Ecology, July 2018, Elsevier

    Dr Nana Ewusi-Mensah, Dr Jacob Ulzen

  21. Bradyrhizobium Inoculants Enhance Grain Yields of Soybean and Cowpea in Northern Ghana

    Article • Frontiers in Plant Science, November 2016, Frontiers

    Dr Jacob Ulzen

  22. Biological Inoculants for Sustainable Intensification of Agriculture in Sub-Saharan Africa Smallholder Farming Systems

    Article • January 2016, Springer Science + Business Media

    Dr Jacob Ulzen