All Stories

  1. 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

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

    Article • Agrosystems Geosciences & Environment, July 2024, Wiley

    Dr Jacob Ulzen

  3. 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

  4. 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

  5. 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

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

    Article • Frontiers in Agronomy, May 2021, Frontiers

    Dr Jacob Ulzen

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

    Article • Frontiers in Agronomy, September 2020, Frontiers

    Dr Jacob Ulzen

  8. 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

  9. 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

  10. 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

  11. 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

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

    Article • Frontiers in Plant Science, November 2016, Frontiers

    Dr Jacob Ulzen

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

    Article • January 2016, Springer Science + Business Media

    Dr Jacob Ulzen