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Performance Evaluation of Proximal Sensors for Soil Assessment in Smallholder Farms in Embu County, Kenya

Piikki, Kristin and Söderström, Mats and Eriksson, Jan and John, Jamleck Muturi and Muthee, Patrick Ireri and Wetterlind, Johanna and Lund, Eric (2016). Performance Evaluation of Proximal Sensors for Soil Assessment in Smallholder Farms in Embu County, Kenya. Sensors. 16:11, 1-21
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Official URL: http://dx.doi.org/10.3390/s16111950

Abstract

Four proximal soil sensors were tested at four smallholder farms in Embu County, Kenya: a portable X-ray fluorescence sensor (PXRF), a mobile phone application for soil color determination by photography, a dual-depth electromagnetic induction (EMI) sensor, and a LED-based soil optical reflectance sensor. Measurements were made at 32-43 locations at each site. Topsoil samples were analyzed for plant-available nutrients (N, P, K, Mg, Ca, S, B, Mn, Zn, Cu, and Fe), pH, total nitrogen (TN) and total carbon (TC), soil texture, cation exchange capacity (CEC), and exchangeable aluminum (Al). Multivariate prediction models of each of the lab-analyzed soil properties were parameterized for 576 sensor-variable combinations. Prediction models for K, N, Ca and S, B, Zn, Mn, Fe, TC, Al, and CEC met the setup criteria for functional, robust, and accurate models. The PXRF sensor was the sensor most often included in successful models. We concluded that the combination of a PXRF and a portable soil reflectance sensor is a promising combination of handheld soil sensors for the development of in situ soil assessments as a field-based alternative or complement to laboratory measurements.

Authors/Creators:Piikki, Kristin and Söderström, Mats and Eriksson, Jan and John, Jamleck Muturi and Muthee, Patrick Ireri and Wetterlind, Johanna and Lund, Eric
Title:Performance Evaluation of Proximal Sensors for Soil Assessment in Smallholder Farms in Embu County, Kenya
Series/Journal:Sensors (1424-8220)
Year of publishing :2016
Volume:16
Number:11
Page range:1-21
Number of Pages:21
Publisher:MDPI
ISSN:1424-8220
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:soil analyses, farms
Keywords:East Africa, proximal sensor, soil assessment, subsistence farming
URN:NBN:urn:nbn:se:slu:epsilon-e-4118
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4118
Additional ID:
Type of IDID
Web of Science (WoS)000389641700183
DOI10.3390/s16111950
ID Code:14244
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:21 Apr 2017 07:10
Metadata Last Modified:21 Apr 2017 07:10

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