Growing Dolichos in Nyandarua

Soil suitability analysis based on Nyandarua's nutrient profile

Quick answer

Yes, with the right inputs — Nyandarua is moderately suited to Dolichos. Nyandarua's soil (pH 5.38, strongly acidic) gives Dolichos a suitability score of 65/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.

Nyandarua County is a solid choice for Dolichos, with a soil-match score of 65/100. Local soils average pH 5.38 — moderately acidic and inside the 5–7.5 band Dolichos prefers, so no lime is usually required. Nitrogen (1.28 g/kg), phosphorus (14 mg/kg) and potassium (166 mg/kg) all meet Dolichos's requirements, so a maintenance fertilizer programme is enough. Dolichos prefers sandy loam soils, while Nyandarua is largely clay, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Dolichos is the #34 soil match of the 106 crops we assess for Nyandarua County. Dolichos's full potential is about 600 kg/acre (~KES 72,000/acre at KES 120/kg), but at Nyandarua's 65/100 suitability a realistic target here is closer to 488 kg/acre (~KES 58,560/acre) unless the constraints above are addressed.

65Suitability score

Soil & climate match

FactorNyandarua soilDolichos needsStatus
pH5.3857.5OK
Nitrogen1.28 g/kgmin 0.5 g/kgOK
Phosphorus14 mg/kgmin 6 mg/kgOK
Potassium166 mg/kgmin 100 mg/kgOK
Rainfall1,100 mm400–1,000 mmHigh
Altitude2,300 m1,000–2,100 mHigh

Planting calendar

Long Rains

Month 1
Sowing & DAP Basal Fertilizer (NO CAN — nitrogen fixer)
Month 2
Weeding & Vine Support if needed
Month 3
Pod Fill & Harvesting

Short Rains

Month 1
Sowing & Basal Fertilizer (no CAN)
Month 2
Weeding & Pest Scouting
Month 3
Harvesting & Seed Drying

Dry Season

Month 1
Post-Harvest seed storage
Month 2
Land Resting (N benefit remains in soil)
Month 3
Seed Selection & preparation

Top dressing guide

Product
None
Timing
None required
Instruction
Dolichos (njahi) fixes its own nitrogen through rhizobia. Do NOT apply CAN — it suppresses nodulation and reduces yield. A starter dose of phosphorus at planting is enough.
Bags per Acre
0

Recommended seed varieties

Njahi BlackMedium/Highland
KALRO · 90-120 days · 8-12 bags/acre
Black hyacinth bean (njahi); popular in Central Kenya; high protein; nitrogen-fixing soil improver.
DL 1002Dryland/Medium
KALRO · 90-110 days · 7-11 bags/acre
Improved dual-purpose lablab; grain and fodder; tolerant to drought and low fertility.
Eldoret BrownMedium
KALRO · 100-130 days · 8-13 bags/acre
Brown-seeded selection; vigorous; good for intercropping with maize.
ELDO-KT Black 1Medium/Highland 10-2000m
University of Eldoret · 135-150 days · 14-22 bags/acre
Black seeded; short cooking time; uniform maturity.
ELDO-KT CreamMedium/Highland 10-2000m
University of Eldoret · 120-135 days · 16-25 bags/acre
Cream seeded; early maturity; good flavor; short cooking time.
ELDO-KT Black 2Medium/Highland 10-2000m
University of Eldoret · 120-135 days · 16-29 bags/acre
Black seeded; medium maturity; robust growth.

Economics

Market priceKES 120/kg
Expected yield in Nyandarua488 kg/acre
Estimated revenueKES 58,560/acre
Adjusted for Nyandarua's 65/100 suitability. Under ideal conditions Dolichos can reach 600 kg/acre (~KES 72,000/acre) — attainable here only after the climate and soil constraints below are addressed.

Preferred textureSandy Loam

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