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Improving fertilizer recommendations for farmers is essential to increase food security in smallholder landscapes. Currently, blanket recommendations are provided across agro-ecological zones, although fertilizer response and nutrient use efficiency by maize crop are spatially variable. We aimed ...


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

Successful implementation of major projects requires careful management of uncertainty and risk. Yet such uncertainty is rarely effectively calculated when analysing project costs and benefits. This paper presents a Bayesian Network (BN) modelling framework to calculate the costs, benefits, and r...


Yet, BarbarosConstantinou, AnthonyFenton, NormanNeil, MartinLuedeling, EikeShepherd, Keith D.[A Bayesian network framework for project cost, benefit and risk analysis with an agricultural development case study]A Bayesian network framework for project cost, benefit and risk analysis with an agricultural development case study
Shepherd, Keith D.Hubbard, D.Fenton, N.Claxton, K.Luedeling, EikeLeeuw, Jan de[Development goals should enable decision-making.]Development goals should enable decision-making.
Towett, Erick K.Alex, M.Shepherd, Keith D.Polreich, S.Aynekulu, ErmiasMaass, Brigitte L.[Applicability of near-infrared reflectance spectroscopy (NIRS) for determination of crude protein content in cowpea (Vigna unguiculata) leaves]Applicability of near-infrared reflectance spectroscopy (NIRS) for determination of crude protein content in cowpea (Vigna unguiculata) leaves
Viscarra Rossel, Raphael A.Behrens, TBen-Dor, E.Brown, D.J.Ben-Dor, E.Brown, D.J.Demattê, JAMShepherd, Keith D.Shi, ZStenberg, BStevens, AAdamchuk, VAïchik, HBarthèsl, BGBartholomeus, H.M.Bayer, ADBernoux, MartialBöttchero, KBrodský, LDu, CWChappell, AFouad, YGenot, VGómez, C.Grunwald, S.Gubler, AHedley, CBKnadel, MMorrás, HJMNocita, MRamírez Lopez, L.Roudier, PRufasto Campos, EMSanborn, PSellitto, VMSudduth, KARawlins, BGWalter, CWinowiecki, Leigh A.Hong, SYJi, W[A global spectral library to characterize the world’s soil]A global spectral library to characterize the world’s soil

Spatial predictions of soil macro and micro-nutrient content across Sub-Saharan Africa at 250 m spatial resolution and for 0–30 cm depth interval are presented. Predictions were produced for 15 target nutrients: organic carbon (C) and total (organic) nitrogen (N), total phosphorus (P), and extrac...


Hengl, T.Leenaars, Johan G.B.Shepherd, Keith D.Walsh, M. G.Heuvelink, Gerard B.M.Mamo, T.Tilahun, H.Berkhout, E.Cooper, M.Fegraus, E.Wheeler, I.Kwabena, N. A.[Soil nutrient maps of Sub-Saharan Africa: assessment of soil nutrient content at 250 m spatial resolution using machine learning]Soil nutrient maps of Sub-Saharan Africa: assessment of soil nutrient content at 250 m spatial resolution using machine learning

Sub-Saharan Africa faces huge food supply challenges due to increasing human population, limited opportunities to increase arable land, and declining yields associated with continuously declining soil fertility. To cater for their food requirements, smallholders use only modest levels of inorgani...


Waithaka, M.M.Thornton, Philip K.Shepherd, Keith D.Ndiwa, Nicholas N.[Factors affecting the use of fertilizers and manure by smallholders: The case of Vihiga, western Kenya]Factors affecting the use of fertilizers and manure by smallholders: The case of Vihiga, western Kenya

Emergence of portable X-ray fluorescence (pXRF) systems presents new opportunities for rapid, low-cost plant analysis, both as a lab system and in situ system. Numerous studies have extolled the virtues of using pXRF for a wide range of plant applications, however, for many such applications, the...


Towett, Erick K.Shepherd, Keith D.Drake, B. Lee[Plant elemental composition and portable X-rayfluore scence (pXRF) spectroscopy:quantification under differentanalytical parameters]Plant elemental composition and portable X-rayfluore scence (pXRF) spectroscopy:quantification under differentanalytical parameters

Characterization of decomposition characteristics is important for sound management of organic residues for both soils and livestock, but routine residue quality analysis is hindered by slow and costly laboratory methods. This study tested the accuracy and repeatability of near-infrared spectrosc...


Shepherd, Keith D.Vanlauwe, BernardGachengo, CNPalm, C.A.[Decomposition and mineralization of organic residues predicted using near infrared spectroscopy]Decomposition and mineralization of organic residues predicted using near infrared spectroscopy
Towett, Erick K.Shepherd, Keith D.Tondoh, Jérôme E.Winowiecki, Leigh A.Tamene, LulsegedNyambura, MercySila, AndrewVågen, Tor-GunnarCadisch, Georg[Total elemental composition of soils in Sub-Saharan Africa and relationship with soil forming factors]Total elemental composition of soils in Sub-Saharan Africa and relationship with soil forming factors

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