NSIS Soil Dataset

EthioSIS Data

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General Information of the Dataset
Owner	MoA-ATI
Sampling Date	2012-2017
Data Type	CSV
Point of Contact	adisumera@gmail.com
Language	English
Spatial Extent	Ethiopia

The Ethiopian Soil Information System (EthioSIS) is a landmark project initiated by the Agricultural Transformation Agency (ATA) and the Ministry of Agriculture of Ethiopia. Since its inception in 2012, the project has collected and analyzed soil samples across the country to develop Woreda-based (district-level) soil fertility maps, which address soil spatial variability and provide site-specific fertilizer recommendations based on the results of soil lab analysis.

The dataset includes about 70,000 records of Ethiopian soil properties collected during the project. Users interested in the data can sign up and request access to the harmonized data.

Contents of the Dataset

Variable	Property	WetChem_Procedure	Spectral_Procedure	Unit
Sample_ID	Sample Unique Identifier	NaN	NaN	NaN
na	Sodium (Na) - extractable	Sodium extractable with the Mehlich III method	Spectral derived as Sodium extractable with the Mehlich III method	mg kg-1
k	Potassium (K) - extractable	Potassium extractable with the Mehlich III method	Spectral derived as Potassium extractable with the Mehlich III method	mg kg-1
ca	Calcium (Ca++) - extractable	Calcium extractable with the Mehlich III method	Spectral derived as Calcium extractable with the Mehlich III method	mg kg-1
mg	Magnesium (Mg) - extractable	Magnesium extractable with the Mehlich III method	Spectral derived as Magnesium extractable with the Mehlich III method	mg kg-1
mn	Manganese (Mn) - extractable	Managnese extractable with the Mehlich III method	Spectral derived as Managnese extractable with the Mehlich III method	mg kg-1
cu	Copper (Cu) - extractable	Cupper extractable with the Mehlich III method	Spectral derived as Cupper extractable with the Mehlich III method	mg kg-1
zn	Zinc (Zn) - extractable	Zinc extractable with the Mehlich III method	Spectral derived as Zinc extractable with the Mehlich III method	mg kg-1
p	Phosphorus (P) - extractable	Phosphorus extractable with the Mehlich III method	Spectral derived as Phosphorus extractable with the Mehlich III method	mg kg-1
s	Sulfur (S) - extractable	Sulfur extractable with the Mehlich III method	Spectral derived as Sulfur extractable with the Mehlich III method	mg kg-1
b	Boron (B) - extractable	Boron extractable with the Mehlich III method	Spectral derived as Boron extractable with the Mehlich III method	mg kg-1
fe	Iron (Fe) - extractable	Iron extractable with the Mehlich III method	Spectral derived as Iron extractable with the Mehlich III method	mg kg-1
al_01	Aluminium property	Aluminium extractable with the Mehlich III method	Spectral derived as Aluminium extractable with the Mehlich III method	mg kg-1
al_02	Aluminium (Al+++) - exchangeable	Aluminium extractable with 1MKCl, volumetric	Spectral derived as Aluminium extractable with 1MKCl, volumetric	mg kg-2
si	Silica	Silica extractable with the Mehlich III method	Spectral derived as Silica extractable with the Mehlich III method	mg kg-1
co	Cobalt	Cobalt extractable with the Mehlich III method	Spectral derived as Cobalt extractable with the Mehlich III method	mg kg-1
mo	Molybdenium	Molybdenium extractable with the Mehlich III method	Spectral derived as Molybdenium extractable with the Mehlich III method	mg kg-1
ph	pH - Hydrogen potential	pH(H2O) measured in 2:1 solution to soil ratio	Spectral derived as pH(H2O) measured in 2:1 solution to soil ratio	pH units
ec	Electrical conductivity property	Electric conductivity measured in 2:1 solution to soil ratio	Spectral derived as Electric conductivity measured in 2:1 solution to soil ratio	dS m-1
hp	Acidity - exchangeable	ExchAcid_ph0-kcl1m	Spectral derived as Exchangeable Acidity	cmolc kg-1
c_01	Carbon (C) - organic_01	Carbon determined by dry combustion with CN analyser	Spectral derived as determined by dry combustion with CN analyser	weight %
c_02	Carbon (C) - organic_02	Carbon determined by Walkely-Black(Nelson-Sommers) Dicchromate-Sulphuric acid oxidation	Spectral derived as Carbon determined by Walkely-Black(Nelson-Sommers) Dicchromate-Sulphuric acid oxidation	weight %
n_01	Nitrogen (N) - total_01	Nitrogen determined by dry combustion with CN analyser	Spectral derived as Nitrogen determined by dry combustion with CN analyser	weight %
n_02	Nitrogen (N) - total_02	Nitrogen determined by Kieldahl acid digestion	Spectral derived as Nitrogen determined by Kieldahl acid digestion	weight %
cec	Cation Exchange Capacity	Cation Exchange Capacity – Determined by leaching with 1 M ammonium acetate followed by 10% potassium chloride	Spectral derived as Cation Exchange Capacity – Determined by leaching with 1 M ammonium acetate followed by 10% potassium chloride	cmolc kg-1
caco3	Calcium carbonate	Dissolution of carbonates by Hydrochloric acid [HCl]; no external (no dry combustion); calcimeter	Spectral derived as Dissolution of carbonates by Hydrochloric acid [HCl]; no external (no dry combustion); calcimeter	weight %

Spectrometer Definition

Bruker®-TENSOR 27 mid infra-red (MIR) spectrometer with the HTS-XT accessory at NSTC and World Agroforestry Center (ICRAF) in Nairobi. The spectra were captured using diffuse reflectance mode with 32 scans and spectral range of 7400 – 600 cm-1 (wave numbers) including part of NIR region and the MIR region spectra. The wave number range of 4000 – 600 cm-1 (2500 – 16667 ηm) were used for further analyses to predict soil chemical properties. Partial least squares regression (PLSR) models were created with different set of soil to predict different nutrient concentrations and soil properties. The PLSR model performed better in predicting C with R2 = 0.91; Si with R2 = 0.91; N with R2 =0.87 and pH with R2 = 0.52; the model performed poor in predicting P, K, Ca, Mg, Mn, S, Cu, B,Zn, Na, Fe, Al, Co, Mo and EC contents