Growing Green Grams in Kiambu

Soil suitability analysis based on Kiambu's nutrient profile

Green Grams can be grown in Kiambu County, but the soil scores 49/100 and needs targeted management to reach full potential. At an average pH of 5.28 the soil is moderately acidic, below Green Grams's preferred 5.5–8 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.01 g/kg), phosphorus (13.7 mg/kg) and potassium (169 mg/kg) all meet Green Grams's requirements, so a maintenance fertilizer programme is enough. Green Grams prefers sandy loam soils, while Kiambu is largely clay, so drainage and organic-matter management matter more here. At current prices (about KES 120/kg) and a typical 300 kg/acre yield, a well-managed Green Grams crop here can gross roughly KES 36,000 per acre.