Publications

Published papers 2020

• Adnan, A.A., Diels, J., Jibrin, J.M., Kamara, A.Y., Shaibu, A.S., Craufurd, P. and Menkir, A. 2020. CERES-Maize model for simulating genotype-by-environment interaction of maize and its stability in the dry and wet Savannas of Nigeria. Field Crops Research Volume 253, 15 August 2020, 107826.

• Adnan, A.A., Diels, J., Jibrin, J.M., Kamara, A.Y., Shaibu, A.S., Garba, I.I., Craufurd, P., and Maertens, M. (FORTHCOMING). Optimizing sowing density-based management decisions on smallholder maize farms in Northern Nigeria. Accepted at: Experimental Agriculture.

• Aliyu, K.T., M Jibrin, J., E Huising, J., M Shehu, B., Adewopo, J.B., B Mohammed, I., Solomon, R., M Adam, A. and M Samndi, A., 2020. Delineation of Soil Fertility Management Zones for Site-Specific Nutrient Management in the Maize Belt Region of Nigeria. Sustainability, 12(21), p.9010.

• Assefa, Banchayehu T., Jordan Chamberlin, Pytrik Reidsma, João Vasco Silva, and Martin K. van Ittersum. 2020. “Unravelling the variability and causes of smallholder maize yield gaps in Ethiopia.” Food Security volume 12, pages 83–103(2020).

• Ayalew, H., Chamberlin, Jordan, and Newman, C. 2020. Site-Specific Agronomic Information and Technology Adoption: A Field Experiment from Ethiopia (No. tep0620). Trinity College Dublin, Department of Economics.

• Bonilla Cedrez, C., J. Chamberlin, and R.J. Hijmans. 2020. “Seasonal, Annual and Spatial Variation in Cereal Prices in Sub-Saharan Africa.” Global Food Security 26(September 2020): 100438.

• Bonilla Cedrez, Camila, Chamberlin, Jordan, Guo, Zhe and Robert J. Hijmans. 2020. “Spatial variation in fertilizer prices in Sub-Saharan Africa.” PLoS ONE 15(1): e0227764.

• Boult, Victoria L., Dagmawi T. Asfaw, Matthew Young, Ross Maidment, Emmah Mwangi, Maurine Ambani, Shamton Waruru, George Otieno, Martin C. Todd, and Emily Black. 2020. Evaluation and validation of TAMSAT-ALERT soil moisture and WRSI for use in drought anticipatory action. Meteorological Applications 2020;27:e1959.

• Kihara, J., Bolo, P., Kinyua, M., Rurinda, J. and Piikki, K., 2020. Micronutrient deficiencies in African soils and the human nutritional nexus: opportunities with staple crops. Environmental Geochemistry and Health, pp.1-19.

• Oladimeji, T.E., Oyinbo, O., Hassan, A.A. and Yusuf, O., 2020. Understanding the Interdependence and Temporal Dynamics of Smallholders’ Adoption of Soil Conservation Practices: Evidence from Nigeria. Sustainability, 12(7), p.2736.

• Nord, A. and Snapp, S. 2020. Documentation of farmer perceptions and site‐specific properties to improve soil management on smallholder farms in Tanzania. Land Degradation & Development 31(15):2074-2086.

• Palmas, S., and J. Chamberlin. 2020. “A Spatial Ex Ante Analysis of Fertilizer Profitability in Tanzania.” PLoS ONE 15(9): e0239149.

• Oyinbo, O., Chamberlin, J. and Maertens, M. 2020. Design of Digital Agricultural Extension Tools: Perspectives from Extension Agents in Nigeria. Journal of Agricultural Economics 71(3):798-815.

• Rurinda, J., Zingore, S., Jibrin, J.M., Balemi, T., Masuki, K., Andersson, J.A., Pampolino, M.F., Mohammed, I., Mutegi, J., Kamara, A.Y. and Vanlauwe, B., 2020. Science-based decision support for formulating crop fertilizer recommendations in sub-Saharan Africa. Agricultural Systems, 180, p.102790.

• Tofa, Abdullahi I., A. Y. Kamara, B. A. Babaji, U. F. Chiezey, A. A. Adnan, A. Beah and A. M. Adam. 2020. Modeling Planting Date Effects on Intermediate Maturing Maize in Contrasting Environments in the Nigerian Savanna: An application of DSSAT Model. Agronomy, 10(6), p.871.

• Tonnang, Henri E. Z., Balemi, T., Masuki, K.F., Mohammed, I., Adewopo, J., Adnan, A.A., Mudereri, B.T., Vanlauwe, B. and Craufurd, P., 2020. Rapid acquisition, management, and analysis of spatial Maize (Zea mays L.) phenological data—Towards ‘Big Data’ for agronomy transformation in Africa. Agronomy, 10(9), p.1363.

• Tonnang, Henri E. Z., Ritter A. Guimapi, Bruce Anani, Dan Makumbi, Bester T. Mudereri, Tesfaye Balemi and Peter Craufurd. 2020. PPMaP: Reproducible and Extensible Open-Source Software for Plant Phenological Phase Duration Prediction and Mapping in Sub-Saharan Africa. Agriculture 2020, 10(11), 515;

• Young, Matthew, Viola Heinrich, Emily Black and Dagmawi Asfaw. 2020. Optimal spatial scales for seasonal forecasts over Africa. Environmental Research Letters 15 094023

Published papers 2019

• Adnan, A.A., Diels, J., Jibrin, J.M., Kamara, A.Y., Craufurd, P., Shaibu, A.S., Mohammed, I.B. and Tonnang, Z.E.H. 2019. Options for calibrating CERES-maize genotype specific parameters under data-scarce environments. PLoS ONE 14(2): e0200118.

• Andrade, J.F., Edreira, J.I.R., Farrow, A., van Loon, M.P., Craufurd, P.Q., Rurinda, J., Zingore, S., Chamberlin, J., Claessens, L., Adewopo, J. and van Ittersum, M.K., 2019. A spatial framework for ex-ante impact assessment of agricultural technologies. Global Food Security, 20, pp.72-81.

• Jin, Z., Azzari, G., You, C., Di Tommaso, S., Aston, S., Burke, M. and Lobell, D.B., 2019. Smallholder maize area and yield mapping at national scales with Google Earth Engine. Remote Sensing of Environment, 228, pp.115-128.

• Kiniry, James R., Sumin Kim, and Henri Tonnang. 2019. Back to the Future: Revisiting the Application of an Enzyme Kinetic Equation to Maize Development Nearly Four Decades Later.  Agronomy, 9(9), 566;

• Oladimeji, T.E. 2019. Effect of soil conservation on productivity and food security on maize farmers in northwest Nigeria. Zaria, Nigeria: Ahmadu Bello University, (145 p.).

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Vranken, L., Kamara, A.Y., Craufurd, P. & Maertens, M. 2019. Farmers’ preferences for high-input agriculture supported by site- specific extension services: Evidence from a choice experiment in Nigeria. Agricultural Systems, 173, 12-26.

• Shehu, B.M., Lawan, B.A., Jibrin, J.M., Kamara, A.Y., Mohammed, I.B., Rurinda, J., Zingore, S., Craufurd, P., Vanlauwe, B., Adam, A.M. and Merckx, R. 2019. Balanced nutrient requirements for maize in the Northern Nigerian Savanna: Parameterization and validation of QUEFTS model. Field Crops Research, 241, p.107585.

• Swai, J., Mbega, E.R., Mushongi, A. and Ndakidemi, P.A. 2019. Post-harvest losses in maize store-time and marketing model perspectives in Sub-Saharan Africa. Journal of Stored Products and Postharvest Research, 10(1), pp.1-12.

• Ten Berge, H.F., Hijbeek, R., van Loon, M.P., Rurinda, J., Tesfaye, K., Zingore, S., Craufurd, P., van Heerwaarden, J., Brentrup, F., Schröder, J.J. and Boogaard, H.L., 2019. Maize crop nutrient input requirements for food security in sub-Saharan Africa. Global Food Security, 23, pp.9-21.

Published papers 2018

• Dagmawi Asfaw, Emily Black, Matthew Brown, Kathryn Jane Nicklin, Frederick Otu-Larbi, Ewan Pinnington, Andrew Challinor, Ross Maidment, and Tristan Quaife. (2018). TAMSAT-ALERT v1: a new framework for agricultural decision support. Geoscientific Model Development

• Shehu, B.M., Merckx, R., Jibrin, J.M., Kamara, A.Y., Rurinda, J., 2018. Quantifying Variability in Maize Yield Response to Nutrient Applications in the Northern Nigerian Savanna. Agronomy 8, 18.

• Tonnang, H.E., Makumbi, D. and Craufurd, P., 2018. Methodological approach for predicting and mapping the phenological adaptation of tropical maize (Zea mays L.) using multi-environment trials. Plant Methods, 14(1), p.108.

Published papers 2017

• Brown, Matt, Emily Black, Dagmawi Asfaw, Fred Out-Larbi, 2017. Monitoring drought in Ghana using TAMSAT-ALERT: a new decision support system. Weather 72, 201-205.

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Papers currently under review in peer reviewed journals

• Abay, Kibrom, Hailemariam Ayalew, Tesfaye Sida, Frederic Kosmowski and Jordan Chamberlin. Standardizing the “Gold Standard”: Systematic Errors in Smallholder Plot Area Estimates from Consumer Grade GPS Receivers. Submitted: Journal of African Economies.

• Adewopo, J., Peter, H., Mohammed, I., Vanlauwe, B. and Craufurd, P., 2020. Can Combination of UAV-derived Vegetation Indices with Biophysical Variable (s) Improve Yield Variability Assessment in Smallholder Farms? In review at: Agronomy. Preprint available.

• Adnan, A.A., J. Diels, J.M. Jibrin, A.Y. Kamara, P. Craufurd, A. S. Shaibu, I. I. Garba. Optimum Stand Density of Tropical Maize Varieties: An On-Farm Evaluation of Grain Yield Responses in the Nigerian Savanna. In review: Archives of Agriculture and Soil Science.

• Assefa, Banchayehu Tessema, Pytrik Reidsma, Jordan Chamberlin, Martin K. van Ittersum. (In review). Is fertilizer use a profitable intensification strategy to Ethiopian smallholder maize producers? Under review at Agricultural Economics.

• Ayalew, Hailemariam, Jordan Chamberlin and Carol Newman. (In review). “Site-Specific Agronomic Information and Technology Adoption: A Field Experiment from Ethiopia.” In review at the Journal of Development Economics.

• Bonilla Cedrez, Camila, Jordan Chamberlin, and Robert J. Hijmans. Price constraints to increasing crop production in Sub-Saharan Africa. Submitted to: Nature Plants.

• Chamberlin, Jordan, T. S. Jayne, and Sieg Snapp. (in review). The Role of Active Soil Carbon in Influencing the Profitability of Fertilizer Use: Empirical Evidence from Smallholder Maize Plots in Tanzania. Submitted to Land Degradation and Development.

• Delaune, Thomas, Antonius G.T. Schut, Joost van Heerwaarden & Jairos Rurinda. (in review.) Exploring variation in yield responses to fertilizer at multiple scales: can geodata improve fertilizer recommendations? Submitted: European Journal of Agronomy.

• Hengl, Tomislav, Matthew A. E. Miller, Josip Krizan, Keith D. Shepherd, Andrew Sila, Milan Kilibarda, Ognjen Antonijevic, Luka Glusica, Achim Dobermann, Stephan M. Haefele, Steve P. McGrath, Gifty E. Acquah, Jamie Collinson, Leandro Parente, Mohammadreza Sheykhmousa, Kazuki Saito, Jordan Chamberlin, Francis B. T. Silatsa, Martin Yemefack, Robert A. MacMillan, Ichsani Wheeler, and Jonathan Crouch. In review. African Soil Properties and Nutrients Predicted at 30–m Spatial Resolution using Two-scale Ensemble Machine Learning. Submitted to: Nature Scientific Reports.

• Kenea, W.B., Reidsma, P., Descheemaeker, K., Rurinda, J., Balemi, T., van Ittersum, M. (Submitted). Variability in yield responses, physiological use efficiencies and recovery fractions of fertilizer use in maize in Ethiopia. In review at: European Journal of Agronomy.

• Kenea, Workneh Bekere, Pytrik Reidsma, Katrien Descheemaeker, Martin van Ittersum, Jairos Rurinda and Tesfaye Balemi. Yield responses, physiological use efficiencies and recovery fractions of fertilizer use in maize across regions in Ethiopia. In review at: European Journal of Agronomy.

• Kosmowski, Frédéric, Jordan Chamberlin, Tesfaye Sida, Hailemariam Ayalew, Kibrom Abay and Peter Craufurd. When the gold standard has not been standardized: Comparing alternative crop cut protocols for yield estimation in smallholder maize fields. Submitted: Food Policy.

• Mugi-Ngenga, E., Zingore, S., Bastiaans, L., Anten, N.P.R., Giller, K.E. Farm-scale assessment of maize – pigeonpea productivity in Northern Tanzania. In review at: Nutrient Cycling in Agroecosystems.

• Nord, A., Bekunda, M., McCormack, C. & Snapp, S. Barriers to sustainable intensification: Overlooked disconnects between agricultural extension and farmer practice in maize-legume cropping systems in Tanzania. In review at: International Journal of Agricultural Sustainability.

• Oyinbo, Oyakhilomen, Jordan Chamberlin, Miet Maertens and Tahirou Abdoulai. “Site-specific digital extension advice and farm performance: Experimental evidence from Nigeria.” Submitted: American Journal of Agricultural Economics. (R&R)

• Ravensbergen, Arie, Jordan Chamberlin, Peter Craufurd, Bello Muhammad Shehu, and Renske Hijbeek. Predicting maize yield response to nutrient supply under highly variable management: a quantile regression approach using QUEFTS in Nigeria. In review at: Field Crops Research.

• Sida, Tesfaye, Jordan Chamberlin, Frédéric Kosmowski, Kibrom Abay, Hailemariam Ayalew, and Peter Craufurd. Implications of intra-plot heterogeneity for yield estimation accuracy and land productivity in smallholder maize systems. In preparation. In review at: Field Crops Research.

Papers in preparation

• Admasu, Yeshwas, Hailemariam Ayalew, Dagim Belay, Jordan Chamberlin and Carol Newman. (In preparation). Site-specific agronomic information and household labor supply decision: A field experiment from Ethiopia.

• Ahmed, Zia, Jordan Chamberlin, Markus Walsh and Peter Craufurd. (In preparation). Identification of Site-specific Maize Fertilizer Recommendations at Scale in Data Sparse Environments: A case study in Ethiopia using Ensemble Machine Learning with Stack Generalization.

• Andersson, Jens A., Tesfaye S. Sida, Renske Hijbeek, Jairos Rurinda, Tesfaye Balemi. (In preparation). Can Site-Specific Nutrient Management fit a geo-spatial framework? Experiences with Nutrient Expert® for smallholder maize growers in Ethiopia

• Assefa, Banchayehu Tessema, Pytrik Reidsma, Jordan Chamberlin, Martin K. van Ittersum. (In preparation). Understanding the selection of technologies and management in maize production by smallholders in Ethiopia.

• Ayalew, Hailemariam, Jordan Chamberlin and Carol Newman. (In preparation). Site-specific agronomic information and input misallocation: A field experiment from Ethiopia.

• Ayalew, Hailemariam, Tesfaye Sida, Jordan Chamberlin, Carol Newman, Frédéric Kosmowski and Kibrom Abay. (In preparation). Caught in the middle: Revisiting the inverse size-productivity relationship with imperfect measures of production and area.

• Garba, I.I., Jibrin, J.M., Kamara, A.Y., Adnan, A.A., Abdulrahman, B.L., Shehu, B.M., and Adam, A.M. Interactive Effects of Secondary Macronutrients and Micronutrients on the Grain Yield, Nutrient Uptake and Use Efficiencies of Maize in the Guinea Savannas of Nigeria. Preprint available from: Preprints 2018, 2018120174

• Guo, Zhe, Jordan Chamberlin and Liang You. Smallholder maize yield estimation using satellite data and machine learning in Ethiopia. Target journal: Remote Sensing.

• Nagol, Elias, A.G.T. Schut, Kenneth F. Masuki, K.E. Giller, Martin K. van Ittersum. Does Soil Catenary effects count? Maize yield spatial variability

• Oyinbo, Oyakhilomen, Jordan Chamberlin, and Miet Maertens. (in preparation). Understanding dynamic responses and disappointment effects in site-specific agronomic information: Experimental evidence from Nigeria.

• Oyinbo, Oyakhilomen, Jordan Chamberlin, and Miet Maertens. (in preparation). Can exposure to site-specific agronomic advice improve smallholders’ willingness to pay for agronomic advice? Evidence from Nigeria.

• Peter, H., Adewopo, J., Kamara, A.Y., Aliyu, K., Dawaki, M. (in preparation). Assessing spatial variability of soil properties to delineate nutrient management zones in smallholder maize-based system. Target: Communications in Soils and Plant Science.

• Rurinda, Jairos, Shamie Zingore, Mirasol F. Pampolino, Ibrahim Mohammed, Tesfaye Balemi, Kenneth Masuki, Jibrin M. Jibrin, Jens A. Andersson, James Mutegi, Peter Q. Craufurd. (in preparation). Manuscript title: Delivering evidence-based agronomic advice to large numbers of farmers in Africa: mobile phone based decision support tool. Target: Computers and Electronics in Agriculture.

• Rutsaert, Pieter, Jordan Chamberlin, and Jason Donovan. Smallholders, agro-dealers and market access: a spatial analysis for Tanzania. Target journal: Food Security.

• Shehu, B.M., Garba, I.I., Jibrin, J.M., Kamara, A.Y., Rurinda, J., Craufurd, P., Adam, A.M., Merckx, R. (In preparation). Diagnosis of nutrient limitations and imbalances in maize in the Northern Nigerian savanna.

• Shehu, B.M., Merckx, R., Jibrin, J.M., Kamara, A.Y. (In preparation). Influence of nutrient limitation Influence of nutrient limitation and rainfall on 13C isotope discrimination of maize in Northern Nigerian Savanna.

• Sida, Tesfaye, J.A. Andersson, R. Hijbeek, et. al. Bringing Site-Specific Nutrient Management (SSNM) to scale in Africa: Towards an institutional context-specific re-design of field-level decision support tools. Target Journal: European Journal of Agronomy.

• Sida, Tesfaye, Jens Andersson, Jordan Chamberlin and Sam Gameda. Digital agronomy: Appraisal of Site-Specific Decision-Support Tools (SS-DSTs) applied in soil fertility management in Ethiopia. Target journal: Computers and Electronics in Agriculture.

• Tiedeman, Kate M., Jordan Chamberlin, Frédéric Kosmowski, Hailemariam Ayalew, Tesfaye Sida, and Robert J. Hijmans. (in preparation). Field data collection methods strongly affect satellite-based crop yield estimation. Target journal: Remote Sensing of Environment.

• Warner, James M, Michael L Mann, Chilot Tizale, and Jordan Chamberlin. (in preparation). Estimating the effects of soil acidity on cereal crop productivity in Ethiopia: A framework for targeting remediation efforts.

Conference, Workshop and Discussion Papers

• Ayalew, H., Chamberlin, J. and Newman, C., 2020. Site-Specific Agronomic Information and Technology Adoption: A Field Experiment from Ethiopia. Trinity Economics Papers: TEP Working Paper No. 0620. January 2020. Department of Economics, Trinity College, Dublin. Available

• Shehu, B.M., Merckx, R., Jibrin, J.M., Kamara, A.Y., Rurinda, J., Craufurd, P., Lawan, B. A., 2018. Site-Specific Nutrient Requirement for two Different Maize Maturity Groups in Northern Nigerian Savanna Agro-Ecological Zone. Tropentag International Conference “Global Food Security and Food Safety: The Role of Universities”, September 17-19, 2018, Ghent, Belgium.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Tahirou, A., Kamara, A.Y., Craufurd, P. & Maertens, M. (2019). Site-specific digital extension advice and farm performance: Experimental evidence from Nigeria. Upgraded paper plenary session. 6th African Association of Agricultural Economists (AAAE) Conference, Abuja, Nigeria, 23-25th September, 2019.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Tahirou, A., Kamara, A.Y., Craufurd, P. & Maertens, M. (2019). Can site-specific extension services improve fertilizer use and yields? Experimental evidence from Nigeria. 170th European Association of Agricultural Economists (EAAE) Seminar, Montpellier, France, 15-17th May, 2019.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Tahirou, A., Kamara, A.Y., Craufurd, P. & Maertens, M. (2019). Can site-specific extension services improve fertilizer use and yields? Experimental evidence from Nigeria. 20th PhD symposium of the Belgian Association of Agricultural Economists, Brussels, Belgium, 24th April, 2019.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Vranken, L., Kamara, A.Y., Craufurd, P. & Maertens, M. (2019). Farmers’ preferences for high-input agriculture supported by site- specific extension services: Evidence from a choice experiment in Nigeria. LIFT project choice experiment workshop, Division of Bioeconomics, KU Leuven, 27th March, 2019.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Vranken, L., Kamara, A.Y., Craufurd, P. & Maertens, M. (2018). Farmers’ preferences for site-specific extension services: Evidence from a choice experiment in Nigeria. 30th International Conference of Agricultural Economists (ICAE), Vancouver, Canada, 28th July – 2nd August, 2018.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Vranken, L., Kamara, A.Y., Craufurd, P. & Maertens, M. (2018). Farmers’ preferences for ICT-based extension services: Evidence from a choice experiment in Nigeria. WOG choice experiment workshop, University of Antwerp, Belgium, 15th June, 2018.

• Oyinbo, O., Chamberlin, J., Vanlauwe, B., Vranken, L., Kamara, A.Y., Craufurd, P. & Maertens, M. (2018). Farmers’ preferences for ICT-based extension services: Evidence from a choice experiment in Nigeria. 19th PhD symposium of the Belgian Association of Agricultural Economists, Brussels, Belgium, 25th April, 2018.

• Oyinbo, O., Chamberlin, J., & Maertens, M. (2019). Design of Digital Agricultural Extension Tools: Perspectives from Extension Agents in Nigeria. Working Paper 2019/1. Bioeconomics Working Paper Series. Division of Bioeconomics, Department of Earth and Environmental Sciences, University of Leuven. Available