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Cropnuts Zanzibar 2025 metadata

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Full name:

Zanzibar Baseline Soil Fertility 2025

Version:

-

Organization or Author:

Cropnuts

Abstract:

This dataset contains approximately 900 georeferenced soil samples collected across Zanzibar, including key chemical and physical properties such as pH, available nutrients (P, K, Mg, Ca), organic matter, total nitrogen, C/N ratio, and soil texture. The data have been generated by Cropnuts, a professional soil laboratory with extensive experience in soil analysis and agricultural advisory services in East Africa. The dataset provides a valuable resource for soil fertility assessment, land management, and agricultural decision-making. Access to the full dataset is available upon request via the banner above.

Service location:

https://soilhive.ag/datasets

Geographical Coverage:

Global

GIS Data Type:

Vector - Point

Spatial resolution:

-

Publication date:

2026-04-30

Reference period-start:

2025-10-08

Reference period-stop

2025-11-05

License:

Cropnuts data license

Soil Properties:

pH, Nitrogen, Phosphorus, Potassium, Organic Matter, Calcium, Magnesium, USDA Texture, C:N Ratio

Soil deph coverage (cm):

-

Citation:

-

Overview

Name Original name Unit of measurement Description Analytical method
pH pH - Soil pH measures the concentration of hydrogen ions (H⁺) in the soil solution, indicating its acidity or alkalinity on a scale from 1 to 14 Spectral NIR
Phosphorus P_available ppm Phosphorus bound to the soil matrix but that can be released into the soil solution (i.e. become bio-available) Spectral NIR
Potassium K_available ppm Potassium bound to the soil matrix but that can be released into the soil solution (i.e. become bio-available) Spectral NIR
Magnesium Mg_available ppm Magnesium bound to the soil matrix but that can be released into the soil solution (i.e. become bio-available) Spectral NIR
Calcium Ca_available ppm Calcium bound to the soil matrix but that can be released into the soil solution (i.e. become bio-available) Spectral NIR
Organic Matter Org_Matter % Soil organic matter is composed of decomposed plant and animal residues, living soil organisms, and humus. It improves soil structure, water retention, nutrient supply, and microbial activity, making it critical for sustainable agriculture and soil health. Spectral NIR
Nitrogen Tot_Nitrogen % Total nitrogen encompasses all nitrogen forms in soil, including organic nitrogen in humus and inorganic nitrogen such as ammonium (NH₄⁺) and nitrate (NO₃⁻). Spectral NIR
C:N Ratio C/N ratio - The C/N ratio represents the proportion of carbon to nitrogen in organic matter. It influences decomposition rates and nutrient availability. Calculated
USDA Texture USDA texture - USDA textural class is a soil classification based on the relative proportions of sand, silt, and clay in the fine earth fraction. It assigns soils to standardized texture classes according to the USDA soil texture triangle and is used to characterise soil physical behaviour, including water retention, aeration, and workability. The textural classes are encoded as follows: 1 = Clay, 2 = Silty Clay, 3 = Sandy Clay, 4 = Clay Loam, 5 = Silty Clay Loam, 6 = Sandy Clay Loam, 7 = Loam, 8 = Silty Loam, 9 = Sandy Loam, 10 = Silt, 11 = Loamy Sand, 12 = Sand Calculated
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