Growing Tree Tomato (Tamarillo) in Machakos

Soil suitability analysis based on Machakos's nutrient profile

Machakos County is a challenging environment for Tree Tomato (Tamarillo) (soil-match score 33/100) and will need significant amendment before planting. At an average pH of 7.03 the soil sits above Tree Tomato (Tamarillo)'s preferred 5.8–7 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.82 g/kg, P 31.4 mg/kg, K 338 mg/kg against this crop's high/high/high demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Tree Tomato (Tamarillo), which favours loam. Tree Tomato (Tamarillo)'s full potential is about 8,000 kg/acre (~KES 640,000/acre at KES 80/kg), but at Machakos's 33/100 suitability a realistic target here is closer to 3,300 kg/acre (~KES 264,000/acre) unless the constraints above are addressed.

33Suitability score

Soil & climate match

FactorMachakos soilTree Tomato (Tamarillo) needsStatus
pH7.035.87Adjust
Nitrogen0.82 g/kgmin 1.2 g/kgLow
Phosphorus31.4 mg/kgmin 20 mg/kgOK
Potassium338 mg/kgmin 200 mg/kgOK
Rainfall700 mm800–1,800 mmLow
Altitude1,100 m1,500–2,800 mLow

Planting calendar

Long Rains

Month 1
Transplanting & Basal
Month 2
Staking & Top Dressing
Month 3
Fruit Development

Short Rains

Month 1
Transplanting & Basal
Month 2
Staking & Top Dressing
Month 3
Fruit Development

Top dressing guide

Product
CAN
Timing
Every 3 months
Instruction
Perennial — ring-apply around the drip line each quarter. Add NPK at flowering.
Bags per Acre
0.5

Economics

Market priceKES 80/kg
Expected yield in Machakos3,300 kg/acre
Estimated revenueKES 264,000/acre
Adjusted for Machakos's 33/100 suitability. Under ideal conditions Tree Tomato (Tamarillo) can reach 8,000 kg/acre (~KES 640,000/acre) — attainable here only after the climate and soil constraints below are addressed.

Preferred textureLoam

Fertilizer prices

DAP
KES 3,500(6,500)
CAN
KES 2,875(4,500)
NPK 17:17:17
KES 3,275(5,600)
Urea
KES 3,500(5,500)
Lime
KES 1,500(1,800)

Green = subsidized · (Commercial) per 50kg bag