Yams farming guide — Kenya

Soil requirements

Growing conditions for Yams

Yams does best with 1,200–1,800 mm of rainfall a year at 0–1,800 m above sea level. In drier areas, irrigation or water harvesting closes the gap; outside the altitude band, growth and yields drop.

Optimizing soil and fertilizers for Yams in Kenya

To achieve maximum yields when farming yams in Kenya, managing soil suitability is crucial. This crop performs best within a soil pH range of 5.5 to 6.5. Soils that fall outside this range can lock out essential macro and micro-nutrients, leading to stunted growth or crop failure. For acidic soils, applying dolomitic or calcitic agricultural lime is recommended at least 30 days before planting to normalize acidity.

Fertilizer application should be calibrated based on the crop’s nutrient demands. Yams has a medium nitrogen requirement, medium phosphorus requirement, and high potassium demand. Using certified seed varieties suited for your specific altitude and rainfall pattern, combined with a precise basal and top-dressing program (such as applying a balanced NPK compound), ensures high crop quality and protects your overall farm investment.

How to grow yams in Kenya

1. 1
   Prepare the soil

   Ensure soil pH is between 5.5 and 6.5. Preferred texture: Sandy Loam. Apply agricultural lime if your pH is below 5.5, ideally 30 days before planting.
2. 2
   Plant at the right time

   Select certified yams seed varieties suited to your altitude zone and plant at the onset of the rains.
3. 3
   Apply basal fertilizer

   Yams needs medium nitrogen, medium phosphorus, and high potassium. Apply a balanced basal fertilizer such as DAP or NPK at planting.
4. 4
   Monitor and harvest

   Scout regularly for pests and disease. Expected yield is about 7,000 kg/acre at roughly KES 80/kg.

Best counties for Yams

Challenging counties for Yams

These counties may need soil amendments for Yams

Certified seed varieties