Dr. Zachary Stewart
Research Assistant Professor
Soil Health | Sustainable Intensification Innovation Lab
Dr. Zach Stewart obtained his M.S. in Control of Infectious Diseases from the London School of Hygiene and Tropical Medicine and his Ph.D. in Soil Science and Crop Physiology from the University of Nebraska-Lincoln. He is currently a Research Assistant Professor and Program Manager for the Feed the Future Sustainable Intensification Innovation Lab (SIIL). He leads SIIL's research activities in international soil and cropping systems with a particular focus on linking agricultural production to improved human nutrition and livelihoods.
As part of the SIIL management entity, Zach leads knowledge management and sharing efforts and conducts research related to global food and nutrition security for smallholder farmers. His domestic and international research focuses primarily on soil health and fertility, fertilizer recommendations, micronutrient fertilization, connecting soil and plant health to human health (i.e. “One Health”), agronomic biofortification, carbon dynamics, sustainable intensification, biochar, and nanoparticle nutrient delivery systems.
He also serves as the Program Manager for the “Sustainable Opportunities to Improve Livelihoods with Soils (SOILS) Consortium” which aims to be the global leader in developing and implementing soil health and fertility enhancing innovations across the developing world. The vision of the SOILS Consortium is to improve the health and fertility of soils as the foundation for nutritious food production and resilient and sustainable livelihoods. Dr. Stewart is passionate about international research and working with smallholder farmers to use agriculture as a pathway out of poverty.
He is especially passionate about increasing the adoption rate of scientific innovations. He has conducted extensive research across sub-Saharan Africa and Southeast Asia on agronomic and human health topics and has active research in Senegal, Burkina Faso, Niger, Tanzania, Ethiopia, and Cambodia. The 2008 recipient of the John Chrystal Award from the World Food Prize Foundation, Zach has been able to use his multidisciplinary background to advance agricultural production while keeping in mind the well-being of those impacted.
- Ph.D. Soil Science and Crop Physiology: University of Nebraska
- M.S. Control of Infectious Disease: London School of Hygiene and Tropical Medicine
- B.S. Biology, Environmental Sciences, International Relations: Creighton University
Dr. Stewart does not have a formal extension appointment; however, most of his research in sub-Saharan Africa (Senegal, Burkina Faso, Niger, Ethiopia, and Tanzania) and Southeast Asia (Cambodia) is associated with bi-directional learning approaches done in farmer's fields to facilitate innovation adoption. These innovations mainly include integrated soil fertility management and cropping systems practices.
Peer-Reviewed Scholarly Publications
- Stewart, Z. P., Pierzynski, G. M., Middendorf, B. J., & Prasad, P. V. 2020. Approaches to Improve Soil Fertility in Sub-Saharan Africa. Journal of experimental botany. DOI: 10.1093/jxb/erz446
- Faye, A., Stewart, Z.P., Ndung’u-Magiroi, K., Diouf, M., Ndoye, I., Diope, T., Dalpé, Y., P.V.V. Prasad, and D. Lesueur. 2020. Testing of commercial inoculants to enhance P uptake and grain yield of promiscuous soybean in Kenya. Sustainability. 12, 3803. https://doi.org/10.3390/su12093803
- Traoré, H., Barro, A., Yonli, D., Stewart, Z.P., and P.V.V. Prasad. 2020. Water Conservation Methods and Cropping Systems for Increased Productivity and Economic Resilience in Burkina Faso. Water. 12(4), 976. https://doi.org/10.3390/w12040976.
- Zachary P. Stewart, Ellen T. Paparozzi, M. Djanaguiraman & Charles A. Shapiro. 2019. Lipid-based Fe- and Zn- nanoformulation is more effective in alleviating Fe- and Zn- deficiency in maize. Journal of Plant Nutrition. doi: 10.1080/01904167.2019.1617314
- Pale Siébou, Coulibaly Z.C.T. Stephen, Yonli Djibril, Mason C. Stephen, Prasad P.V. Vara, Noufe Tiatité, Fofana Souleymane, Traore Hamidou, Zachary P. Stewart. 2019. Typology of Farms and Farmers’ Perception of the Effects of Soil and Water Conservation Practices in Northern Burkina Faso. Journal of Agriculture and Crops. DOI: https://doi.org/10.32861/jac.512.251.265
- Coulibal Z.C.T. Stephen, Noufé Tiatité, Palé Siébou, Yonli Djibril, P.V. Vara Prasad, Zachary P. Stewart, Mason C. Stephen, Traoré Hamidou, and Fofana Souleymane. 2019. Economic Performance of Soil and Water Conservation Practices in Burkina Faso. Research in Agriculture. DOI: https://doi.org/10.22158/ra.v4n1p38
- C. A., Bavougian, Shapiro, C. M., Stewart, Z. P., Eskridge, K. 2018. Comparing biological and conventional chemical soil tests in long-term tillage, rotation, N rate field study. Soil Science Society of America Journal. doi: 10.2136/sssaj2018.06.0240
- Djanaguiraman M, Prasad PVV, Stewart ZP, Perumal R, Min D, Djalovic I, Ciampitti IA. 2018. Agroclimatology of oats, barley, and minor millets. In: Agroclimatology: Linking Agriculture to Climate (Eds. J. Hatfield, M. Sivakumar, J. Prueger). American Society of Agronomy. Monograph 60, Madison, Wisconsin, US.
- Prasad PVV, Djanaguiraman M, Stewart ZP, Ciampitti IA. 2018. Agroclimatology of maize, sorghum, and pearl millet. In: Agroclimatology: Linking Agriculture to Climate (Eds. J. Hatfield, M. Sivakumar, J. Prueger). American Society of Agronomy. Monograph 60, Madison, Wisconsin, US.
- Stewart Z.P., Pierzynski G.M., Middendorf B.J., and Prasad P.V.V. 2017. Sub-Saharan Africa Soil Fertility Prioritization Report. Bureau for Food Security USAID. Washington D.C., United States.
- Middendorf B.J., Pierzynski G.M., Stewart Z.P., and Prasad P.V.V. 2017. Sub-Saharan Africa Soil Fertility Prioritization: Summit Results. Bureau for Food Security USAID. Washington D.C., United States.
- Pierzynski G.M., Middendorf B.J., Stewart Z.P., and Prasad P.V.V. 2017. Sub-Saharan Africa Soil Fertility Prioritization: Survey Results. Bureau for Food Security USAID. Washington D.C., United States.
- Middendorf B.J., Stewart Z.P., and Prasad P.V.V. 2016. Final Report of the Research Uptake Study Survey Results. Bureau for Food Security USAID. Washington D.C., United States.
- Stewart, Z. P. 2016. Micronutrient Foliar Analysis and Supplementation in Nutrient Management for High Yield Maize (Zea mays L.). PhD Dissertation. University of Nebraska. Lincoln, NE.
- Stewart, Z. P., Oxborough, R. M., Tungu, P. K., Kirby, M. J., Rowland, M. W., & Irish, S. R. 2013. Indoor Application of Attractive Toxic Sugar Bait (ATSB) in Combination with Mosquito Nets for Control of Pyrethroid-Resistant Mosquitoes. PloS one, 8(12), e84168.
- Stewart, Z., & Francis, C. 2013. One Billion Hungry: Can We Feed the World? by Gordon Conway: Cornell University Press, Ithaca, New York. 2012. 439 pp., paperback, $24.95. ISBN 978-0-8014-7802-4. Agroecology and Sustainable Food Systems, 37(8), 964-967.
- Stewart, Z., & Francis, C. 2013. Foodopoly: The Battle Over the Future of Food and Farming in America, by Wenonah Hauter: The New Press, New York, NY. 2012. 355 p., cloth, $26.95. ISBN 978-1-59558-790-9. Agroecology and Sustainable Food Systems, 37(10), 1187-1190.
- Stewart, Z., Stepanovic, S. & Shapiro, C. 2016. Iron Management in high pH Soils: A Strong Candidate for Precision Farming Technologies. Proceedings of the Great Plains Soil Fertility Conference. IPNI. Denver, CO.
- Stewart, Z. P & Shapiro, C. A. 2014. Effect of Tillage, Rotation, (Maize and Soybeans), and Nitrogen Rate in a Long Term Study on Solvita, Water Extract, H3A Extract Soil Health Values. Proceedings of the 44th North Central Extension-Industry Soil Fertility Conference.Vol. 30, 178-182.
- Stewart Z. P. 2012. Attractive Toxic Sugar Baits (ATSB) located near mosquito nets for control of pyrethroid resistant Anopheles arabiensis and Culex quinquefasciatus in Northeast Tanzania. MSc Thesis., London School of Hygiene and Tropical Medicine, London Call number: 105874.
- Stewart Z.P., Middendorf B.J., Prasad P.V.V., Musumba, M., Grabowski, P., Palm, C., and Snapp, S. 2018. Sustainable Intensification Assessment Framework Online Toolkit. www.sitoolkit.com.
- Stewart, Z. P., Oxborough, R. M., Tungu, P. K., Kirby, M. J., Rowland, M. W., & Irish, S. R. Indoor Attractive Toxic Sugar Baits for Control of Resistant Mosquitoes. UK Patent: 105874 November 2013.