Is Tharaka Nithi good for growing Coffee (Arabica)?

Tharaka Nithi County scores 51/100 for Coffee (Arabica) suitability (moderate). Soil pH is 4.99 against a preferred 5–6, nitrogen 1.23 g/kg and phosphorus 19.6 mg/kg. County rainfall is 900 mm/year against Coffee (Arabica)'s 1000–2000 mm range. Soil amendments or irrigation may be needed before planting Coffee (Arabica).

What fertilizer is best for Coffee (Arabica) in Tharaka Nithi?

Base the plan on Tharaka Nithi's soil: pH 4.99 (apply lime to reach 5–6), nitrogen 1.23 g/kg and phosphorus 19.6 mg/kg. Get an exact bag-per-acre basal and top-dressing schedule free at https://shambaiq.com/app.

What soil pH does Coffee (Arabica) need, and does Tharaka Nithi have it?

Coffee (Arabica) grows best at pH 5–6. Tharaka Nithi averages pH 4.99, which is outside the ideal range and may need lime or sulphur.

How much can I earn from Coffee (Arabica) per acre in Tharaka Nithi?

At roughly KES 120/kg and an expected 800 kg/acre, gross revenue is about KES 96,000 per acre before input costs. Use the ShambaIQ budget tool for a net figure based on your fertilizer plan.

Growing Coffee (Arabica) in Tharaka Nithi

Soil suitability analysis based on Tharaka Nithi's nutrient profile

Quick answer

Possible but challenging — Tharaka Nithi is only marginally suited to Coffee (Arabica). Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Coffee (Arabica) a suitability score of 51/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.

Coffee (Arabica) can be grown in Tharaka Nithi County, but the soil scores 51/100 and needs targeted management to reach full potential. At an average pH of 4.99 the soil is strongly acidic, below Coffee (Arabica)'s preferred 5–6 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 mg/kg) all meet Coffee (Arabica)'s requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Coffee (Arabica), which favours loam. On ShambaIQ's soil-match model, Coffee (Arabica) is the #83 soil match of the 106 crops we assess for Tharaka Nithi County. Coffee (Arabica)'s full potential is about 800 kg/acre (~KES 96,000/acre at KES 120/kg), but at Tharaka Nithi's 51/100 suitability a realistic target here is closer to 510 kg/acre (~KES 61,200/acre) unless the constraints above are addressed.

Better matched to Tharaka Nithi's soil: Avocado, Macadamia, and Cassava — each scores higher on the same soil.

Suitability score

Soil & climate match

Factor	Tharaka Nithi soil	Coffee (Arabica) needs	Status
pH	4.99	5–6	Adjust
Nitrogen	1.23 g/kg	min 1.2 g/kg	OK
Phosphorus	19.6 mg/kg	min 12 mg/kg	OK
Potassium	211 mg/kg	min 200 mg/kg	OK
Rainfall	900 mm	1,000–2,000 mm	Low
Altitude	1,100 m	1,300–2,200 m	Low

Planting calendar for Tharaka Nithi

Long Rains· March–MayMain season here

March

Fertilizer Application & Weed Control

April

Fruit Development Monitoring

May

Light Pruning & Pest Management

Short Rains· October–December

October

Cherry Ripening & Selective Harvesting

November

Post-Harvest Fertilizer Application

December

Pruning & Stumping if needed

Dry Season· January–March

January

Main Pruning & Soil Conservation

February

Rest & Recovery

March

Pre-Season Fertilizer & Soil pH Check

Top dressing guide

Product

CAN

Timing

Split 3 times per year

Instruction

Apply after harvest, at flowering, and during berry expansion.

Bags per acre in Tharaka Nithi

Tharaka Nithi's nitrogen (1.23 g/kg) already meets Coffee (Arabica)'s 1.2 g/kg requirement, so this is a maintenance rate.

Recommended seed varieties

No variety in our list is specifically rated for Tharaka Nithi's 1,100 m altitude and 900 mm rainfall, so all 5 are shown. Confirm with your agrovet before buying.

Ruiru 11Medium/Highland

Coffee Research Institute · 730-1000 days · 750–1250 kg/acre

Compact; resistant to CBD and leaf rust.

BatianMedium/Highland

Coffee Research Institute · 730-1000 days · 1000–1500 kg/acre

Tall variety; excellent cup quality; disease resistant.

SL 28Medium/Highland

Coffee Research Foundation · 730-1000 days · 900–1400 kg/acre

Classic Kenyan cultivar (1935); large bean; excellent cup quality; drought tolerant; suited to 1300-1800m; susceptible to leaf rust.

SL 34Medium/Highland

Coffee Research Foundation · 730-1000 days · 1000–1500 kg/acre

Classic Kenyan cultivar (1930s); bold bean; excellent cup quality; suited to high rainfall zones 1300-1800m; susceptible to leaf rust.

K7Medium/Highland

Coffee Research Foundation · 730-1000 days · 750–1100 kg/acre

Released 1936; partial leaf rust resistance; good cup quality; suited to medium altitude 1300-1600m.

Economics

Market priceKES 120/kg

Expected yield in Tharaka Nithi510 kg/acre

Estimated revenueKES 61,200/acre

Adjusted for Tharaka Nithi's 51/100 suitability. Under ideal conditions Coffee (Arabica) can reach 800 kg/acre (~KES 96,000/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

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