infrared spectroscopy

Welcome to AfricaSoils.net

The Africa Soil Information Service (AfSIS) is developing a practical, timely, and cost-effective soil health surveillance service to map soil conditions, set a baseline for monitoring changes, and provide options for improved soil and land management. Because knowledge about the condition and trend of African soils is highly fragmented and dated, there is an urgent need for accurate, up-to-date, and spatially referenced soil information to support agriculture in Africa.

Developing Soil Maps and a Soil Health Surveillance System

At present no standards, definitions or criteria exist for the assembly, mapping and interpretation of soil legacy data sets, case definitions, soil health and degradation, diagnostic tests, and sampling designs for assessing and monitoring soil condition. It is thus difficult to derive spatially and temporally consistent evaluations of the occurrence of soil degradation, or to provide evidence-based management recommendations for maintaining and improving soil health.

Spectral Diagnostics

One of the key challenges for AfSIS is how to measure soil functional properties on tens of thousands of georeferenced soil samples. Spectral diagnostics – the use of low cost, high throughput analytical techniques based on light reflectance – solves this problem. Infrared and x-ray spectroscopic analytical techniques that required minimal sample preparation are used as a front line screening tool. More expensive and time-consuming measurements of soil functional properties are then calibrated to the spectral measurements on a subset of samples.

National Institutions

We view human and institutional capacity strengthening as the key to building ownership of the project by national institutions and consequently ensuring sustainability of not only AfSIS, but also the science and technology behind it.

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