Growing Tree Tomato (Tamarillo) in Garissa

Soil suitability analysis based on Garissa's nutrient profile

Quick answer

Generally not ideal — Garissa is poorly suited to Tree Tomato (Tamarillo). Garissa's soil (pH 7.96, alkaline) gives Tree Tomato (Tamarillo) a suitability score of 0/100. Match fertilizer to Garissa's nitrogen and phosphorus levels for the best result.

Garissa County is a challenging environment for Tree Tomato (Tamarillo) (soil-match score 0/100) and will need significant amendment before planting. At an average pH of 7.96 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 0.61 g/kg, P 37.7 mg/kg, K 407 mg/kg against this crop's high/high/high demand — so the fertilizer plan below prioritises closing that deficit. Tree Tomato (Tamarillo) prefers loam soils, while Garissa is largely sandy, so drainage and organic-matter management matter more here. Garissa receives approximately 250 mm/year — well below Tree Tomato (Tamarillo)'s minimum of 800 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Tree Tomato (Tamarillo) is the #100 soil match of the 106 crops we assess for Garissa County. Tree Tomato (Tamarillo)'s full potential is about 8,000 kg/acre (~KES 640,000/acre at KES 80/kg), but at Garissa's 0/100 suitability a realistic target here is closer to 0 kg/acre (~KES 0/acre) unless the constraints above are addressed.

Better matched to Garissa's soil: Sisal, Aloe Vera, and Green Grams — each scores higher on the same soil.

0Suitability score

Soil & climate match

FactorGarissa soilTree Tomato (Tamarillo) needsStatus
pH7.965.87Adjust
Nitrogen0.61 g/kgmin 1.2 g/kgLow
Phosphorus37.7 mg/kgmin 20 mg/kgOK
Potassium407 mg/kgmin 200 mg/kgOK
Rainfall250 mm800–1,800 mmLow
Altitude200 m1,500–2,800 mLow

Planting calendar for Garissa

Long Rains· MarchMay

March
Transplanting & Basal
April
Staking & Top Dressing
May
Fruit Development

Short Rains· OctoberDecemberMain season here

October
Transplanting & Basal
November
Staking & Top Dressing
December
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 in Garissa
0.750.5

Garissa's nitrogen (0.61 g/kg) is 51% of the 1.2 g/kg Tree Tomato (Tamarillo) needs, so the standard 0.5 bags/acre is raised to 0.75. Split it across two applications to limit leaching.

Economics

Market priceKES 80/kg
Expected yield in Garissa0 kg/acre
Estimated revenueKES 0/acre
Adjusted for Garissa's 0/100 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(5,700)
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