Understanding regions of various nutrient deficiencies and soil acidity constraints enables fertilizer blenders to customize and target their products and is key to maximizing returns on fertilizer investments. Politically, this information and data is very influential at a policy level to increase awareness of deficiencies besides nitrogen, phosphorus, and potassium, and can be used to target fertilizer types and liming initiatives.

Soil is fundamental to ensuring the growth of healthy plants. But not all soil is created equal. As a result of many factors such as environmental impacts and inefficient farming practices, different soils can have wildly different characteristics, even within a relatively small region. Knowing soil deficiencies can inform farmers what sort of nutrients their lands need to improve productivity.

During the KeFERT Technical Roundtable Meeting in October 2018, a key priority identified by the stakeholders was on the need for soil fertility and acidity mapping. While a great deal of soil analysis data has been collected in Kenya, it has never been brought together and converted into maps. Until now.

Many analytical service laboratories, amongst them KALRO, SGS, One Acre Fund, and Crop Nutrition Laboratories, have analyzed thousands geo-referenced soil samples using public funds from various parts of Kenya that contribute to these maps. These samples provide enough data that is then combined with other mapping layers such as soil classification, climate data, and topography, provide a basis for determining predominant nutrient deficiencies and acidity constraints at a regional scale.

Preliminary maps from specific counties will be presented in the webinar as a first step to the development of Kenya’s nutrient deficiency and pH constraint maps, leading to identification of spatial gaps that would inform future soil sampling, with an emphasis on high-potential agricultural regions/counties. The public access to these maps is a national public good, informing farmers, fertilizer providers, and policy makers with information needed to address nutrient and soil pH constraints.

Speakers and Panelists


Prof. Hamadi Boga
Principal Secretary, State Department for Crop Development & Agricultural Research

Jeremy Cordingley
Founder / Managing Director, Cropnuts


Thule Lenneiya
Ag Transformation Office, Ministry of Agriculture, Livestock, Fisheries and Irrigation, Kenya

Eustace Muriuki
Chairman, FAK

Joseph Alubakah
General Manager, Homa Lime Limited, Kenya

Dr. John Wendt