Crop Nutrition Laboratory Services (Cropnuts)

Crop Nutrition Laboratory Services Ltd, trading as Cropnuts, is East Africa's leading agricultural testing laboratory and agronomy advisory company, headquartered in Limuru, Kenya. With more than twenty years of continuous operation, the organization serves the full spectrum of African agricultural stakeholders—smallholder farmers, large commercial farming operations, food exporters, agribusinesses, fertilizer manufacturers, NGOs, and government agencies. Cropnuts combines rigorous laboratory science with field-level advisory expertise, making it a single-source partner for both analytical data and the agronomic interpretation needed to act on those results. The company reports a client base of approximately 75,000 smallholder farmers and over 12,000 corporate clients across Sub-Saharan Africa.

Soil testing and nutrient analysis is the cornerstone service at Cropnuts. The laboratory performs comprehensive soil fertility assessments measuring macronutrients—nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulphur (S)—alongside a full suite of micronutrients including iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B), and molybdenum (Mo). Samples are prepared using the Mehlich 3 multi-element extraction procedure, and elemental concentrations are determined by inductively coupled plasma optical emission spectrometry (ICP-OES), the same methodology recognized under the laboratory's ISO/IEC 17025 accreditation scope. Soil pH, organic carbon, and physical parameters are also routinely determined. Results feed directly into data-driven fertilizer and lime recommendations tailored to specific crops and field conditions across East and West Africa.

Water quality testing is a second core discipline at Cropnuts, available to clients in Kenya, Nigeria, and Zambia. The laboratory analyses irrigation water, borehole water, drinking water, and process water for a broad range of chemical parameters including pH and a comprehensive suite of potentially phytotoxic or human-health-relevant elements: aluminum (Al), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), boron (B), sulphur (S), silicon (Si), zinc (Zn), manganese (Mn), molybdenum (Mo), copper (Cu), and sodium (Na). Elemental analysis is performed by ICP-OES under the laboratory's KENAS-accredited methodology. This service enables farmers, irrigation scheme operators, and agribusinesses to assess water suitability for crop production and livestock consumption, and to demonstrate compliance with environmental and food-safety regulations.

Food safety testing at Cropnuts supports compliance with both national and international market requirements, particularly for Sub-Saharan African commodity exporters supplying buyers in Europe and the Middle East. The laboratory screens for pesticide residues across more than 500 compounds in a single multi-residue gas chromatography (GC) run. Mycotoxin analysis covers the principal regulated classes—aflatoxins, ochratoxin A, patulin, fumonisins, zearalenone, nivalenol, and deoxynivalenol (DON)—using enzyme-linked immunosorbent assay (ELISA) and, where greater sensitivity or confirmation is required, high-performance liquid chromatography coupled with mass spectrometry (HPLC-MS). Microbiological testing identifies pathogenic bacteria, fungal pathogens, and viruses that can cause foodborne illness. Heavy metal quantification in food matrices completes the safety panel, enabling exporters of fresh produce, grains, and processed foods to supply credible safety data to regulated markets.

Animal feed analysis at Cropnuts helps livestock producers and feed manufacturers verify both nutritional quality and safety. The laboratory uses near-infrared (NIR) spectroscopy and wet chemistry to determine crude protein, metabolizable energy, crude fibre, moisture, ash, and macro- and micromineral content. Feed samples are also screened for mycotoxins to safeguard animal health and protect downstream food safety in milk and meat supply chains. Fertilizer and compost analysis enables manufacturers and distributors to verify NPK label claims, total macro- and micronutrient content, and the absence of contaminants—supporting regulatory approval processes and commercial trust in agricultural inputs. Plant tissue analysis and disease diagnosis—available in Kenya, Nigeria, Zambia, and Malawi—allows growers to identify nutritional deficiencies and diseases including fungal, bacterial, and nematode problems, forming the diagnostic foundation for targeted crop interventions.

Cropnuts holds ISO/IEC 17025 accreditation granted by the Kenya Accreditation Service (KENAS), making it one of the very few East African agricultural laboratories to carry internationally recognized, independently audited quality certification for testing. The laboratory has maintained this accreditation for close to ten years. The accredited scope covers elemental analysis of soil by Mehlich 3 extraction measured by ICP-OES and water elemental analysis and pH determination by ICP-OES across eleven test parameters. ISO/IEC 17025 accreditation confirms that Cropnuts operates under a documented quality management system with defined standard operating procedures, instrument calibration traceability, measurement uncertainty estimation, proficiency testing participation, and periodic external audit—giving clients the assurance that results are reproducible and defensible for regulatory and commercial purposes.

Cropnuts operates from multiple offices across Sub-Saharan Africa to serve regional markets. The main laboratory and headquarters are located in Limuru, off Limuru Road, near Nairobi, Kenya. Regional operations are anchored by an office in Ibadan, Nigeria and in Lusaka, Zambia. This multi-country presence optimizes sample logistics, on-site advisory visits, and turnaround times for clients throughout East and West Africa. Beyond the laboratory, Cropnuts is a recognized leader in precision agriculture and farm advisory services. Its independent agronomy team—which neither sells nor profits from any products it recommends—combines over twenty years of documented field trial experience with advanced tools including satellite imagery for remote crop monitoring and IoT sensor networks for real-time field data. Agri-finance consulting rounds out the offering, helping smallholder and commercial farmers access financing tied to evidence-based agronomic plans. This combination of accredited laboratory science, multi-country presence, and independent advisory expertise makes Cropnuts a uniquely comprehensive and credible analytical and strategic partner for agricultural stakeholders across Sub-Saharan Africa.