Publications by authors named "Keith Shepherd"

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A global soil spectral grid based on space sensing.
José A M Demattê, Rodnei Rizzo, Nícolas Augusto Rosin, Raul Roberto Poppiel, Jean Jesus Macedo Novais, Keith D Shepherd

Sci Total Environ· March 2025

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Building a near-infrared (NIR) soil spectral dataset and predictive machine learning models using a handheld NIR spectrophotometer.
Colleen Partida, Jose Lucas Safanelli, Sadia Mannan Mitu, Mohammad Omar Faruk Murad, Yufeng Ge, Keith Shepherd

Data Brief· February 2025

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Controls on timescales of soil organic carbon persistence across sub-Saharan Africa.
Sophie F von Fromm, Sebastian Doetterl, Benjamin M Butler, Ermias Aynekulu, Asmeret Asefaw Berhe, Keith D Shepherd

Glob Chang Biol· January 2024

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Spatial approach for diagnosis of yield-limiting nutrients in smallholder agroecosystem landscape using population-based farm survey data.
Stephen M Ichami, George N Karuku, Andrew M Sila, Fredrick O Ayuke, Keith D Shepherd

PLoS One· March 2022

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Changes in organic carbon to clay ratios in different soils and land uses in England and Wales over time.
Jonah M Prout, Keith D Shepherd, Steve P McGrath, Guy J D Kirk, Kirsty L Hassall

Sci Rep· March 2022

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Portable X-ray fluorescence (pXRF) calibration for analysis of nutrient concentrations and trace element contaminants in fertilisers.
Gifty E Acquah, Javier Hernandez-Allica, Cathy L Thomas, Sarah J Dunham, Erick K Towett, Keith D Shepherd

PLoS One· February 2022

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iSDAsoil: The first continent-scale soil property map at 30 m resolution provides a soil information revolution for Africa.
Matthew A E Miller, Keith D Shepherd, Bruce Kisitu, Jamie Collinson

PLoS Biol· November 2021

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African soil properties and nutrients mapped at 30 m spatial resolution using two-scale ensemble machine learning.
Tomislav Hengl, Matthew A E Miller, Josip Križan, Keith D Shepherd, Andrew Sila

Sci Rep· March 2021

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Comprehensive nutrient analysis in agricultural organic amendments through non-destructive assays using machine learning.
Erick K Towett, Lee B Drake, Gifty E Acquah, Stephan M Haefele, Steve P McGrath, Keith D Shepherd

PLoS One· January 2021

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Mineral-nutrient relationships in African soils assessed using cluster analysis of X-ray powder diffraction patterns and compositional methods.
Benjamin M Butler, Javier Palarea-Albaladejo, Keith D Shepherd, Kamau M Nyambura, Erick K Towett

Geoderma· October 2020

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Evidence-based investment selection: Prioritizing agricultural development investments under climatic and socio-political risk using Bayesian networks.
Barbaros Yet, Christine Lamanna, Keith D Shepherd, Todd S Rosenstock

PLoS One· August 2020

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Soil and farm management effects on yield and nutrient concentrations of food crops in East Africa.
Sahrah Fischer, Thomas Hilger, Hans-Peter Piepho, Irmgard Jordan, Jeninah Karungi, Keith Shepherd

Sci Total Environ· May 2020

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Forest restoration: Overlooked constraints.
Eike Luedeling, Jan Börner, Wulf Amelung, Katja Schiffers, Keith Shepherd

Science· October 2019

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Pre-treatment of soil X-ray powder diffraction data for cluster analysis.
Benjamin M Butler, Andrew M Sila, Keith D Shepherd, Mercy Nyambura, Chris J Gilmore

Geoderma· March 2019

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Fertilizer response and nitrogen use efficiency in African smallholder maize farms.
Stephen M Ichami, Keith D Shepherd, Andrew M Sila, Jetse J Stoorvogel, Ellis Hoffland

Nutr Cycl Agroecosyst· November 2018

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Soil nutrient maps of Sub-Saharan Africa: assessment of soil nutrient content at 250 m spatial resolution using machine learning.
Tomislav Hengl, Johan G B Leenaars, Keith D Shepherd, Markus G Walsh, Gerard B M Heuvelink

Nutr Cycl Agroecosyst· August 2017

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Environmental implications of high metal content in soils of a titanium mining zone in Kenya.
David M Maina, Douglas M Ndirangu, Michael M Mangala, Johan Boman, Keith Shepherd

Environ Sci Pollut Res Int· November 2016

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Evaluating the utility of mid-infrared spectral subspaces for predicting soil properties.
Andrew M Sila, Keith D Shepherd, Ganesh P Pokhariyal

Chemometr Intell Lab Syst· April 2016

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Mapping Soil Properties of Africa at 250 m Resolution: Random Forests Significantly Improve Current Predictions.
Tomislav Hengl, Gerard B M Heuvelink, Bas Kempen, Johan G B Leenaars, Markus G Walsh, Keith D Shepherd

PLoS One· March 2016

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Policy: Development goals should enable decision-making.
Keith Shepherd, Douglas Hubbard, Norman Fenton, Karl Claxton, Eike Luedeling

Nature· July 2015

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Soil spectroscopy: an opportunity to be seized.
Marco Nocita, Antoine Stevens, Bas van Wesemael, David J Brown, Keith D Shepherd

Glob Chang Biol· January 2015

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Quantification of total element concentrations in soils using total X-ray fluorescence spectroscopy (TXRF).
Erick K Towett, Keith D Shepherd, Georg Cadisch

Sci Total Environ· October 2013

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Applicability of near-infrared reflectance spectroscopy (NIRS) for determination of crude protein content in cowpea (Vigna unguiculata) leaves.
Erick K Towett, Merle Alex, Keith D Shepherd, Severin Polreich, Ermias Aynekulu

Food Sci Nutr· January 2013

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Rapid Erosion Modeling in a Western Kenya Watershed using Visible Near Infrared Reflectance, Classification Tree Analysis and Cesium.
Jeff B deGraffenried, Keith D Shepherd

Geoderma· December 2009

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Environmental science. Digital soil map of the world.
Pedro A Sanchez, Sonya Ahamed, Florence Carré, Alfred E Hartemink, Jonathan Hempel, Keith D Shepherd

Science· August 2009

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