Growing Dolichos in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Quick answer

Yes, with the right inputs — Kirinyaga is moderately suited to Dolichos. Kirinyaga's soil (pH 5.31, strongly acidic) gives Dolichos a suitability score of 68/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.

Kirinyaga County is a solid choice for Dolichos, with a soil-match score of 68/100. Local soils average pH 5.31 — moderately acidic and inside the 5–7.5 band Dolichos prefers, so no lime is usually required. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Dolichos's requirements, so a maintenance fertilizer programme is enough. Dolichos prefers sandy loam soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Dolichos is the #47 soil match of the 106 crops we assess for Kirinyaga County. Dolichos's full potential is about 600 kg/acre (~KES 72,000/acre at KES 120/kg), but at Kirinyaga's 68/100 suitability a realistic target here is closer to 510 kg/acre (~KES 61,200/acre) unless the constraints above are addressed.

68Suitability score

Soil & climate match

FactorKirinyaga soilDolichos needsStatus
pH5.315–7.5OK
Nitrogen1.36 g/kgmin 0.5 g/kgOK
Phosphorus12.5 mg/kgmin 6 mg/kgOK
Potassium177 mg/kgmin 100 mg/kgOK
Rainfall1,300 mm400–1,000 mmHigh
Altitude1,500 m1,000–2,100 mOK

Planting calendar for Kirinyaga

Long Rains· March–MayMain season here

March
Sowing & DAP Basal Fertilizer (NO CAN — nitrogen fixer)
April
Weeding & Vine Support if needed
May
Pod Fill & Harvesting

Short Rains· October–December

October
Sowing & Basal Fertilizer (no CAN)
November
Weeding & Pest Scouting
December
Harvesting & Seed Drying

Dry Season· January–March

January
Post-Harvest seed storage
February
Land Resting (N benefit remains in soil)
March
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 in Kirinyaga
0

Kirinyaga's nitrogen reads 1.36 g/kg, but the rate stays at zero: Dolichos is not top-dressed, for the crop-specific reason above.

Seed varieties for Kirinyaga

6 dolichos varieties are rated for Kirinyaga's altitude (1,500 m) and rainfall (1,300 mm):

Njahi Black· Medium/HighlandDL 1002· Dryland/MediumEldoret Brown· MediumELDO-KT Black 1· Medium/Highland 10-2000mELDO-KT Cream· Medium/Highland 10-2000mELDO-KT Black 2· Medium/Highland 10-2000m
Full variety details — maturity, yield & breeder →

Economics

Market priceKES 120/kg
Expected yield in Kirinyaga510 kg/acre
Estimated revenueKES 61,200/acre
Adjusted for Kirinyaga's 68/100 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